U-boat Archive - U-boat KTB - U-160 3rd War Patrol

U-548 - 1st War Patrol

Translation by Jerry Mason

Departed	Date	Arrived	Date	Days at Sea
Kiel	21 March 1944	Lorient	24 June 1944	96

Click the icon to download a KMZ file displaying the U-boat track, significant events and locations for this patrol. You must have Google Earth loaded on your computer to view this file. Download Google Earth here

Ships Hit
Date	KTB Time	Position	Ship	Tons	Nationality	Convoy
7 May 44	04.32	46°03'N, 52°25'W	HMCS VALLEYFIELD (K 329)	1,445	Canadian	ONM-234

			Total = 1,445
Note: The positions in the table above and in the Google Earth patrol summary are derived from the KTB and in many cases do not match those set forth in authoritative references such as Jürgen Rohwer, Axis Submarine Successes of World War Two or the Uboat.net website. The goal here is to present the picture relative to the U-boat and not the absolute position that the ship was attacked or sank.









				K r i e g s t a g e b u c h
				of the Unterseebootes "U 548"


				( 1st Patrol )



			Kommandant:	Oberleutnant zur See Zimmermann



			Beginning:	21 March 1944
			Ending:	24 June 1944



			All D.Z.G. and naval squares.
			Patrol in accordance with Operations Order 56




			Distribution:	2 x O.K.M.
				1 x B.d.U.
				1 x Kom.Adm.Uboote
				1 x F.d.U. West
				1 x F.d.U. Ausbildung
				1 x 27. U.-Flottille
				1 x 2. U.-Flottille









				© U-boat Archive 2023 - all rights reserved

Click the flag to view the above page from the original German KTB

- 1 -




	21.03.44
	08.00	Kiel Wik	Cast off for 1st war patrol in accordance with Order 5. U.-Flottille Secret Order No. 708, tactical transit with Valentiner to Kristiansand.
		NbyW 5, Sea 4, cloudy, 1004 mb
	09.15	Kiel Lightship	Taken in convoy by Sperrbrecher 172.
	12.00	AO 7732	Day's run: Surfaced 29 nm, Submerged . / . = 29 nm
		NWbyW 5, Sea 4, 8/10, 1004 mb
	15.15	AO 7544	Aircraft alarm for training on 3 approaching Ju's. Recognition Signals exchanged.
	16.00 - 19.00	AO 7544	Damage control/combat role exercises.
		NW 5, Sea 4, 9/10, 1005 mb
	20.00	AC 7199
		NW 5, Sea 4, 9/10, 1005 mb
	24.00	AO 7244
		NW 4, Sea 3, 8/10, 1006.5 mb

	22.03.44
	00.19	AO 7221	Passed Seelande Rev barrier.
	04.00	AO 4875
		NE 5, Sea 4, 9/10, 1009 mb
	07.46	AC 4843	Aircraft. Recognition Signal exchanged with approaching Condor.
	08.00	AO 4843
		NE 5, Sea 4, 9/10, 1009 mb
	11.40	AO 4571	Released from Sperrbrecher Point Black 19a.
			Taken in convoy by patrol boat.
	12.00	AO 4571	Day's run: Surfaced 207.7 nm.
		NNE 3, Sea 2-3, 9/10, 1012 mb
	15.48	AO 4426	Released from patrol boat.
	15.54	AO 4429	Crash dive for training. Boat balanced. Surfaced.
	16.32		Continued transit to Kristiansand South.
	17.00 - 20.00	AO 3635
		NE 3, Sea 2, 6/10, 1017.5 mb	Role exercises.
	20.20	AN 3624	Arrived Point Black 26. No lighthouse burning.
	22.32		Engaged in signal traffic with Signal Station Oksöy.
	23.00		Lighthouses burn.
	24.00	AN 3615
		NE 1, Sea 0, 9/10, 1018 mb

	23.03.44
	00.25		Passed Oksöy Lighthouse.
	01.02		Passed Marvik barrier.
	01.15		Made fast Marvik
	04.00	Marvik
		SW 3, 9/10, snow squalls, 1018 mb
	08.00	Marvik	Report to Seekmdt. Departure scheduled at 17.00 hours with Fischer and Hilbig.
	12.00	Marvik	Day's run: Surfaced 127.3 nm, Submerged 1.5 nm = 128.8 nm
		SW 3, Sea 4, 1018 mb
	16.30	Marvik	Sailed
		SW 4, 9/10, 1018 mb, misty, Vis. 1500 meters
	17.00	AN 3612	Taken in convoy by 2 mine search boats.
	19.32	AN 3538	2 small shadows bearing 260°T. English S-boats. Range 1500 meters. Open fire for all anti-aircraft weapons. Shots lie well. S-boats turn away immediately and disappear in the mist. No bubble tracks seen. Apparently they did not reach shooting position. The M-boat proceeding behind had initially not seen, but pursues at high speed and sends the S-boats a few bursts of fire.
	20.00	AN 3529	Continue transit.
		NW 4-5. Sea 4, 8/10, 1017 mb, misty
	24.00	AN 3193
		NW 5, Sea 4, 6/10, 1017 mb, Vis. changing, snow showers

	Sun and Moon Data 21.03.44
	Sun and Moon Data 22.03.44
	Sun and Moon Data 23.03.44

- 2 -




	24.03.44
	02.00	AN 3161	Released from convoy. Initially per Outbound Orders offset 30 nm from the coast. Then head via AF 49, AF 44, and via AE 68, AE 87, AK 58. Came to course 295°. Fischer and Hilbig remain in convoy to Bergen.
	04.00	AN 3116
		NW 5, Sea 3, 7/10, 1012.5 mb, long Swell
	04.45	AN 3112	Dived to proceed submerged.
	05.55	AN 3112	Came to course 345°.
	12.00	AN 2977	Day's run: Surfaced 104.3 nm, Submerged 33.2 nm = 137.5 nm
	22.47	AN 2944	Surfaced. Searchlight bearing 90°R below the horizon. Apparently searchlight battery on land, watching the Fjord entrance.
	24.00	AN 2839
		SW 2, Sea 1, 7/10, 1020 mb, Vis. changing

	25.03.44
	00.58	AN 2832	Dived to proceed submerged.
	04.00	AN 2398	Went to receiving depth for very low frequency program time. No reception. Only interference on the frequency.
	08.00	AN 2392
	12.00	AN 2367	Day's run: Surfaced 28.9 nm, Submerged 45.8 nm = 74.7 nm
	16.00	AN 2362
	20.00	AN 2338
	23.30		Surfaced.
	23.55		Came to NW-course.
	24.00	AF 8787	After 10 operating hours frequency indicator of the Wanz failed. 2 resistors burned through that burned through again immediately after replacement. Gear is only operable for audio reception.
		W 1, Sea 0-1, long Swell, overcast, rain, 1022 mb

	26.03.44
	00.20		Incoming Radio Message 1846/25/58: On 26 March 08.00 hours switch Zimmermann Ireland Circuit, Lamby Coastal Circuit.
	01.57	AF 8749	Dived.
	08.00	AF 8742	Switched to Ireland Circuit.
	12.00	AF 8718	Day's run: Surfaced 33.8 nm, Submerged 40.4 nm = 74.2 nm
	16.00	AF 8714
	20.00	AF 8711
	22.00	AF 8711	Surfaced. Strong Northern Lights. Because of that very clear horizon.
	24.00	AF 7668
		SW 3, Sea 1-2, 7/10, 1022 mb, long Swell

	27.03.44
	00.26	AF 7664	Dived.
	08.00	AF 7639
	08.45		Sound bearings from 30-90°. Bright tone mixed with chirps. Went to periscope depth. We have run into a pack of hogfish that make these sounds.
	12.00	AF 7626	Day's run: Surfaced 30.7 nm, Submerged 42.3 nm = 73 nm
	16.00	AF 7623
	20.00	AF 7388
	21.55	AF 7388	Surfaced.
		WNW 3, Sea 2, 7/10, hail squalls, 1021 mb
	24.00	AF 7346

	Sun and Moon Data 24.03.44
	Sun and Moon Data 25.03.44
	Sun and Moon Data 26.03.44
	Sun and Moon Data 27.03.44

- 3 -




	28.03.44
	00.24	AF 7343	Dived.
	08.00	AF 7315
	12.00	AF 7311	Day's run: Surfaced 33.6 nm, Submerged 37.2 nm = 71.8 nm
	13.33	AF 7311	Came to course 304°.
	16.00	AF 4977
	20.00	AF 4899
	20.45	AF 4895	Surfaced.
	21.10		Dived.
	23.36	AF 4895	Surfaced.
	23.50	AF 4897	Crash dive for detection. 2.5 meters Wanz detection. Initially search, after 2 minutes short detection, quickly growing louder. No sound bearing, believe it to be an aircraft.
		NNW 4, Sea 3, long Swell, 8/10, hail and snow squalls, 1022 mb

	29.03.44
	01.25	AF 4891	Surfaced.
	02.39		Incoming Radio Message 1703/28/168: Zimmermann, Fischer, Hilbig, Sternberg, Stark give passing report on entering Blue D-W. After giving report, all boats switch "Diana" Circuit.
	03.28	AF 4854	Dived.
	08.00	AF 4843
	12.00	AF 4843	Day's run: Surfaced 29.0 nm, Submerged 29.8 nm = 58.8 nm
	16.00	AF 4842
	20.00	AF 4818
	21.58	AF 4817	Surfaced. Took navigation fix. Difference between dead reckoning and actual position after navigation fix 40°T, 9 nm.
	24.00	AF 4831
		NW 3, Sea 2, high Swell, 7/10, 1022 mb

	30.03.44
	00.30	AF 4489	Dived.
	08.00	AF 4485
	12.00	AF 4484	Day's run: Surfaced 31.8 nm, Submerged 29.2 nm = 61 nm
	16.00	AF 4473
	20.00	AF 4457
	22.00	AF 4449	Surfaced. The night was like day due to the bright moonshine and strong Northern Lights.
		NW 2, Sea 1, Swell, 1020 mb, 2/10
		NW 2, Sea 1, Swell, 1020 mb, 2/10	Difference between dead reckoning and actual position after a navigation fix 302°T, 14 nm.
			Came to course 244°.
	24.00	AE 6656

	31.03.44
	00.22	AE 6656
		NNE 3, Sea 2, 4/10, 1022 mb	Dived
	08.00	AE 6657
	12.00	AE 6649	Day's run: Surfaced 31.2 nm, Submerged 33.8 nm = 65 nm
	16.00	AE 6672
	19.30		4 heavy depth charge series bearing 290°R. Went to periscope depth, nothing seen.
	20.00	AE 6671
	22.49	AE 6674	Surfaced.
	24.00	AE 6597
		NNE 4, Sea 3, overcast, 1022 mb, NW-Swell

	01.04.44
	01.07	AE 6823	Dived.
	08.00	AE 6824
	12.00	AE 6816	Day's run: Surfaced 29.8 nm, Submerged 31.7 nm = 61.5 nm
	16.00	AE 6818
	22.00	AE 6817	Came to course 231°.
	22.49	AE 6763	Surfaced.
	24.00	AE 6765
		S 7-8, Sea 7, cross sea, 10/10, snow storm, 1013 mb

	Sun and Moon Data 28.03.44
	Sun and Moon Data 29.03.44
	Sun and Moon Data 30.03.44
	Sun and Moon Data 31.03.44
	Sun and Moon Data 01.04.44

- 4 -




	02.04.44
	02.19	AE 6767	Dived.
	08.00	AE 6782
	12.00	AE 6784	Day's run: Surfaced 23.2 nm, Submerged 36.3 nm = 66.5 nm
	16.00	AE 6787
	20.00	AE 6777
	22.57	AE 9112	Surfaced.
	24.00	AE 9114
		S 7-8, Sea 7, 9/10, 1007 mb

	03.04.44
	01.26	AE 8338	Dived.
	02.00	AE 8362	All clocks set ahead one hour. (DSZ).
	08.00	AE 8361
	12.00	AE 8356	Day's run: Surfaced 24.7 nm, Submerged 33.3 nm = 58 nm
	16.00	AE 8359
	20.00	AE 8358
	24.00	AE 8381	Surfaced
		SE 7, Sea 6, 10/10, 1011 mb

	04.04.44
	03.15	AE 8611	Dived.
	08.00	AE 8536
	12.00	AE 8538	Day's run: Surfaced 32.2 nm, Submerged 33.3 nm = 65.5 nm
	16.00	AE 8561
	24.00	AE 8556

	05.04.44
	00.46	AE 8556	Surfaced.
		SE 7, Sea 6, 10/10, 1007 mb
	03.20	AE 8579	Dived.
	08.00	AE 8578
	12.00	AE 8811	Day's run: Surfaced 30 nm, Submerged 38 nm = 68 nm
	16.00	AE 8814
	20.00	AE 8736
	22.25		Incoming Radio Message: 1224/5/124
			1) Zimmerman occupy Blue ZY 80 as temporary attack area from it daily between 00-02 and 10-12 hours report weather by Short Signal. First report on entering this area.
	24.00	AE 8761	Came to course for AK 36

	06.04.44
	00.38	AE 8761	Surfaced. Difference between dead reckoning and actual position after a navigation fix 282°T, 19 nm.
		WSW 4, long Swell 3, 5/10, 1020 mb, very bright
		WSW 4, long Swell 3, 5/10, 1020 mb, very bright	New position AE 8728
	02.59	AE 8748	Dived.
	04.00	AE 8747
	08.00	AE 8771
	12.00	AE 7996	Day's run: Surfaced 28.8 nm, Submerged 38.0 nm = 68.8 nm
	16.00	AE 7999
	20.00	AL 3132
	24.00	AL 3134
		WSW 2-3, Swell 1-2, 3/10, 1010 mb

	07.04.44
	00.49	AL 3126	Surfaced.
	01.45		Wanz detection, dived. No sound bearing.
	02.10	AL 3125	Surfaced.
	04.00	AL 3141
		WSW 2, long Swell, 3/10, 1008 mb
	04.18		Outgoing Radio Message on Ireland Circuit: My position is AL 31. Still have 210 cbm fuel.
			"U 548"
	04.35	AL 3141	Dived.
	08.00	AL 2266

	Sun and Moon Data 02.04.44
	Sun and Moon Data 03.04.44
	Sun and Moon Data 04.04.44
	Sun and Moon Data 05.04.44
	Sun and Moon Data 06.04.44
	Sun and Moon Data 07.04.44

- 5 -



	continued
	07.04.44
	12.00	AL 2264	Day's run: Surfaced 32.2 nm, Submerged 39.9 nm = 72.1 nm
	16.00	AL 2259
	20.00	AL 2258
	24.00	AL 2281

	08.04.44
	01.27	AL 2273	Surfaced. Difference between dead reckoning and actual position after a navigation fix 46°T, 9 nm.
		SW 2, long Swell, 8/10, 1007 mb, marine phosphorescence, bright Northern Lights
	04.00	AL 2197
		SW 2, Swell, 8/10, rain squalls, 1007 mb
	04.08		Because my position was not heard, sent again on 54 meters.
			Outgoing Radio Message on 54 meters: My position is AL 23, Still have 210 cbm fuel.
			"U 548"
	04.15		Dived.
	08.00	AL 2323
	12.00	AL 2322	Day's run: Surfaced 36.2 nm, Submerged 44.8 nm = 81 nm
	16.00	AL 2324	Radio Message 1344/8/793: Zimmermann and Fischer are reminded of passing report. Therefore was not heard again.
	20.00	AL 2316
	24.00	AL 2318
		SSE 4-5, Sea 3-4, passing showers overcast, 980 mb

	09.04.44
	00.55	AL 2318	Surfaced.
	03.43		Outgoing Radio Message 0343/9/180: My position is AL 14. Still have 210 cbm fuel.
			"U 548"
	04.00	AL 1456
		SSE 5, Sea 4, 10/10, 980 mb
	08.00	AL 1457
	12.00	AL 1449	Day's run: Surfaced 35 nm, Submerged 38.4 nm = 73.4 nm
	20.00	AL 1471
	24.00	AL 1396	End of twilight
		SSE 3-4, long Swell, 7/10, 985 mb

	10.04.44
	00.15		Surfaced. Difference between dead reckoning and actual position after a navigation fix 42°T, 10 nm. New square AL 1395.
	03.30	AL 1522	Detection in Wanz and Naxos. Volume 4, quickly growing louder. Crash dive. Because horizon at the moment was very clear and sharp and nothing was seen, it could only have been an aircraft.
	08.00	AL 1521
	12.00	AL 1516	Day's run: Surfaced 33.6 nm, Submerged 38.4 nm = 72 nm
	16.00	AL 1514
	20.00	AK 3636
	24.00	AK 3638	End of twilight
		AK 3638
		SE 3, Swell 2, 4/10, 982 mb

	11.04.42
	00.02		Surfaced.
	01.07	AK 3662	Outgoing Short Signal weather report: 59°N, 27°W, air pressure steady 982 mb, up to 1/4 overcast, cloud form not possible, mainly cloudy to overcast, with moderately strong wind. Vis. moderate, horizon just barely distinguished, no fog. Wind direction unchanged from the SE, light breeze 2, Swell as abated 2-4 meters high from the SE. 40-150 meters long, +9°C, air temperature same as water temperature.
	03.30	AK 3694	Dived to listen.
	04.45	AK 3689	Surfaced. Difference between dead reckoning and actual position after a navigation fix 224°T, 24 nm.
	07.15	AK 3846	Dived.
	07.25		Twilight.

	Sun and Moon Data 07.04.44
	Sun and Moon Data 08.04.44
	Sun and Moon Data 09.04.44
	Sun and Moon Data 10.04.44
	Sun and Moon Data 11.04.44

- 6 -



	continued
	11.04.44
	11.04	AK 3849	Surfaced.
	11.24		Outgoing Radio Message Short Signal weather report:
			58°N, 28°W, 982 mb, steady, up to 3/4 Cumulus clouds. Shifting wind, Vis. good up to 10 nm, NE 2, shifting to the left, unchanged, moderately high E-Swell, medium long, +11°C, air temperature 2 higher.
	11.30	AK 3872	Naxos detection, Volume 3, dived.
	12.00		Day's run: Surfaced 52.3 nm, Submerged 33.3 nm = 86.6 nm
	16.00	AK 3875
	20.00	AK 3878
	20.03		Radio Message 1741/11/747: Zimmermann begin weather reporting. On 12 April 08.00 switch to America I Circuit.
	23.59		Twilight
	24.00	AK 0311
		SW 3, Sea 2, 10/10, 987 mb, + 6°C, +9°C

	12.04.44
	00.03		Surfaced.
	00.25		Radio Message 0011/12/751: "Zimmermann":
			Seeleutnant Röck is promoted in rank effective 1 April. Congratulations.
			Kom.Adm.Uboote
	00.30	AK 0311	Outgoing Radio Message 0030/12 Short Signal weather report: 58°N, 28°W, 998 mb, rising, drizzle, shifting wind in rainy weather, Vis. moderate up to 5 nm, SW Wind, shifting right. Evenly blowing breeze 3. SW-Swell abating, length 40 meters, +6°C air temperature lower than water temperature 1.6-2.0°C
	03.34	AK 3969	Dived to listen.
	04.53	AK 3992	Surfaced. Visibility changing greatly in the moonlight. Marine phosphorescence.
	05.22		Outgoing Radio Message 0452/12/754: 0107 from 11 April was first weather report. Am missing Rose No. 4. 5. 7.
			"Zimmermann"
	07.10	AK 3996	Dived, twilight.
	08.00	AK 3995	Switched to America I Circuit.
	10.31	AK 3992	Surfaced. Fired all weapons.
			Even though automatic 3.5 cm has not been taken apart since departure and only provisionally preserved by daily application of oil and grease, the gun worked flawlessly.
	10.49		Outgoing Radio Message Short Signal weather report 1049/12: 58°N, 28°W, 990 mb rising, up to 1/4 Cumulus clouds, shifting wind with rainy weather, Vis. changing up to 10 nm, SW-Wind breeze 3, SW-Swell unchanged, medium-long, 3-4 meters high. +7°C air temperature lower than water 1.6-2.0°C.
	11.12	AK 3968	Dived.
	12.00		Day's run: Surfaced 40.7 nm, Submerged 37.7 nm = 76.4 nm
	16.00	AK 3964
	16.48		Radio Message 1442/12/242: To "Zimmermann" Rose 4, 5, and 7.
	16.55		Radio Message 1347/12/240: "Zimmermann": the 3 missing Rose Radio Messages were re-encoded. Confirm reception by Short Signal "Yes".
	20.00	AK 3939
		SW 3, Sea 2, 10/10 (rain), 990 mb, +7°C
	24.00	AK 3934

	Sun and Moon Data 11.04.44
	Sun and Moon Data 12.04.44

- 7 -




	13.04.44
	00.03		End of twilight. Surfaced.
	00.15		Outgoing Radio Message 0017/13/248 Short Signal:
			"Yes".
	00.49	[typo should be 57°N]	Outgoing Radio Message Short Signal weather report 0049/13: 37°N, 29°W, falling 984 mb, nearly completely overcast, medium-high, thick, uniform Stratus clouds. Sustained precipitation, Vis. bad, however no fog. SE-Wind shifting to the left at strength 4, wind has freshened, SE-Swell unchanged 2-4 meters high, 40 meters long, +6°C air temperature lower than water 3.1-4°C.
	0147		Incoming Radio Message 1629/12/244:
			1) Hossenfelder occupy Blue FX 80 as attack area. Report weather by Short Signal. First report on entering attack area.
			2) Zimmermann released thereafter, continue SW-transit to operations area.
	03.32	AK 3767	Dived to listen.
	04.25	AK 3791	Surfaced. In the brief time the wind has shifted to NE and blows at 7-8. Visibility 1000 to 2000 meters. Bright marine phosphorescence.
		NE 7-8, Sea 6, 10/10, 989 mb, +9°C
	07.10	AK 3791	Dived, twilight.
	10.16	AK 3764	Surfaced to give Short Signal weather report, Vis. very bad. Misty.
	10.42		Outgoing Radio Message 1042/13 Short Signal weather report: 58°N, 29°W, 990 mb rising, nearly completely overcast, medium-high, thick, uniform Stratus clouds. For hours persistent precipitation, Vis. low, horizon unclear. Wind E 7 shifting to the left, E-Swell, moderately high, medium-long. +9°C air temperature lower than water temperature 0.1-0.5°C.
	10.55	AK 3761	Dived.
	12.00		Day's run: Surfaced 29.9 nm, Submerged 34.2 nm = 64.1 nm
	12.14	AK 3761	6 depth charge detonations in the direct vicinity. Went to periscope depth. Nothing seen, no sound bearings. Apparently bearing was taken on Radio Message and we had a skilled aircraft.
	16.00	AK 3737
	20.00	AK 3734
	24.00	AK 3597
		ENE 3-4, Sea 3, 7/10, 999 mb, +9°C

	14.04.42
	00.15	AK 3597	Surfaced.
	00.25	AK 3597	End of twilight.
	00.49		Outgoing Radio Message 0252/12 Short Signal weather report: 59°N, 29°W, rising 1000 mb, up to 3/4 overcast, medium-high Stratus clouds, shifting wind with rainy weather, Vis. low, horizon unclear, NE-wind 3, NE-Swell unchanged, short. +10°C air temperature higher than water temperature 0.6-1.0°C.
			Because Short Signal weather report was not heard, had it sent again on various Circuits.
	03.06	AK 3558	Dived to listen.
	08.00	AK 3552

	Sun and Moon Data 13.04.44
	Sun and Moon Data 14.04.44

- 8 -



	continued
	14.04.44
	10.19	AK 3528	Surfaced.
		NE 4-5, Sea 2-4, 7/10, fog, 1006 mb, +9°C
	11.05		Outgoing Radio Message 1105/14 Short Signal weather report: 60°N, 29°W, rising 1006 mb, nearly overcast, low uniform Stratus clouds with moderate winds, Vis. bad due to precipitation and fog. N-Wind 4, N-Swell unchanged, medium-length, 2-4 meters high. + 9°C, air same as water temperature.
	11.27	AK 3527	Dived.
	12.00	AK 3524	Day's run: Surfaced 28.6 nm, Submerged 36.6 nm = 65.2 nm
		N 4, Sea 2, 8/10, misty, 1006 mb, +9°C
	16.00	AK 3521
	20.00	AK 3387
	24.00	AK 3384
		N 1-2, Sea 0-1, 9/10, 1010 mb, +8°C

	15.04.44
	00.10	AK 3381	Surfaced.
	00.23		Twilight.
	01.56		Outgoing Radio Message 0156/15 Short Signal weather report: 59°N, 29°W, rising 1010 mb, up to 3/4 overcast Cumulus clouds, mainly cloudy to overcast with weak winds, Vis. low, horizon unclear. N-Wind 1, N-Swell has abated, low and short. +8°C air higher than water temperature 1.6-2.0°C.
	03.30	AK 3324	Dived to listen.
		Fog
	04.15		Surfaced.
	07.27		Twilight.
	07.55	AK 3184
		NE 3-4, Sea 3, 10/10 (misty), 1012 mb, +7°C
	10.53	AK 3181	Surfaced.
	11.17		Outgoing Radio Message 1117/15 Short Signal weather report: 60°N, 29°W, rising 1012 mb, drizzle, mainly cloudy to overcast, Vis. moderate up to 5 nm, horizon barely discernible. NO-Wind 4, N-Swell, moderately high, short, +10°C air higher then water temperature 0.1-0.5°C.
	11.20		Dived.
	12.00	AK 3157	Day's run: Surfaced 47.9 nm, Submerged 35.3 nm = 83.2 nm
		NE 3-4, Sea 3, overcast, 1012 mb, +10°C
	16.00	AK 3154
	16.17		Incoming Radio Message 0732/15/702: To "U 548" for Lt.z.S. Röck, congratulations.
			Flottille-Chef.
	19.30	AK 3127	Heavy depth charge series, sustained, apparently from search group, no propeller sounds, went to periscope depth up to 10 meters, nothing seen.
	20.00	AK 3127
	24.00	AK 3125
		NE 2, Sea 2, 9/10, misty, foggy, 1016 mb, +7°C
	16.04.44
	00.20	AK 3126	Surfaced.
	00.36		Twilight.
	01.17		Outgoing Radio Message 0117/16 Short Signal weather report: 61°N, 29°W, rising 1016 mb, nearly overcast, medium-high Stratus clouds, mostly cloudy with weak winds, Vis. moderate. NE-Wind 2, NE-Swell unchanged, 2-4 meters high, +7°C air lower than water temperature 1.6-2.0°C.

	Sun and Moon Data 14.04.44
	Sun and Moon Data 15.04.44
	Sun and Moon Data 16.04.44

- 9 -



	continued
	16.04.44
	02.44		Hossenfelden has sent his first weather report, Came to SW course in accordance with orders.
	03.10	Vis. deteriorating 100-1500 meters, misty, faint Northern Lights
	03.25	AK 3136	Dived to listen.
	03.45		Surfaced, continued transit.
	06.50		Twilight.
	07.10	AK 3165	Dived to proceed submerged.
	08.00	AK 3165
		E 1-2, Sea 1, misty, 1003 mb, +10°C
	12.00	AK 3167	Day's run: Surfaced 37.4 nm, Submerged 38.6 nm = 76.0 nm
		SE 2, Sea 1, 9/10, horizon passing showers, 1009 mb, +10.5°C, water +10°C
	13.15		Surfaced.
	13.55	AK 3183	Dived.
	14.03		Incoming Radio Message 1208/16/718: "To Zimmermann" Head for Blue OZ 30, no further weather reports.
	16.00	AK 3186
	20.00	AK 3188
	24.00	AK 3321
		SE 6, Sea 5, 10/10, 998 mb, +7°C

	17.04.44
	00.03		Surfaced.
	00.35		Twilight.
	04.00	AK 3321
		S 5-6, Sea 4, 8/10 (rain), 997 mb, +7°C
	07.10	AK 3515	Dived, twilight.
	08.00	AK 3514
		S 5, Sea 4, rain 8/10, 996 mb, +7°C
	12.00	AK 3517	Day's run: Surfaced 49.2 nm, Submerged 33.0 nm = 82.2 nm
	13.25	AK 2639	Surfaced.
		SW 4, Sea 3, 5/10 (rain), 996 mb, +7.5°C
	14.05	AK 2663	Dived.
	16.00	AK 2663
	20.00	AK 2665
		S 2, Sea 2, 7/10 (rain), Swell 4
	24.00	AK 2668
		SE 2, Sea 1, 9/10 (misty), 998 mb

	18.04.44
	00.20	AK 2667	Surfaced. Difference between dead reckoning and actual position after a navigation fix 315°T, 6 nm.
	00.35		Twilight.
	04.00	AK 2688
		SSW 2, Sea 1, S-Swell, 9/10 (passing showers), 988 mb, +7°C
	07.05		Twilight.
	07.20	AK 2842	Dived.
	08.00	W 3-4, Sea 2, 7/10 (passing showers), 986 mb
	12.00	AK 2844	Day's run: Surfaced 53.6 nm, Submerged 29.9 nm = 83.5 nm
		NW 5, Sea 4, 7/10, (passing showers), 985 mb, +7.5°C
	14.00	AK 2844	Surfaced.
	14.45	AK 2769	Dived.
	16.00	AK 2769
	20.00	AK 2793
		NW 5, Sea 4, 7/10
	23.55	AK 2795	Surfaced.
	24.00	AK 2795
		NW 6, Sea 5, 7/10 (passing showers), 985 mb, +7.5°C

	19.04.44
	00.45		Twilight.

	Sun and Moon Data 16.04.44
	Sun and Moon Data 17.04.44
	Sun and Moon Data 18.04.44
	Sun and Moon Data 19.04.44

- 10 -



	continued
	19.04.44
	04.00	AK 2794	Fliege out of service.
		NW 6. Sea 5, 5/10 (misty), 991 mb, +7.6°C
	07.57	AK 2973	Dived.
		NW 7, Sea 6, overcast (rain), 999 mb, +7°C
	07.30		Twilight.
	12.00	AK 2978	Day's run: Surfaced 61.7 nm, Submerged 30.8 nm = 92.5 nm
	13.50	AK 2978	Surfaced.
	16.03	AK 5215	Dived. After drying with blow drier and changing the detector the Fliege is in service again.
		NWbyW 6-7, Sea 5-6, cloudy (rain), 1002 mb, +7°C
	20.00	AK 5217
		N 2, NW-Swell 3, 8/10 (passing showers)
	23.45	AK 5241	Surfaced.
	24.00	AK 5241
		N 0-1, NW-Swell 3, overcast (rain), 1010 mb, +7.5°C

	20.04.44
	00.35		Twilight.
	04.00	AK 5189
		SE 3, Sea 2, 10/10, 1005 mb, +8°C
	08.00	AK 5445
		E 4-5, Sea 3, mist (rain) 10/10, 1000 mb, +7.6°C
	08.17		Dived.
	12.00	AK 5447	Day's run: Surfaced 81.4 nm, Submerged 28.6 nm = 110 nm
		SE 4-5, Sea 4, low hanging clouds, Vis. 1000 meters
	14.03	AK 5471	Surfaced.
	15.05	AK 4696	Dived.
		E 4-5, Sea 3-4, rain, Vis. 1000-2000 meters, 1000 mb
	16.00	AK 4696
	20.00	AK 4698
		SbyW 5-6, Sea 4-5, rain, Cumulus clouds
	24.00	AK 4931
		WbyS 9-10, Sea WbyS 8, completely overcast, Vis. medium, 1004 mb

	21.04.44
	00.10	AK 4934	Surfaced.
	00.45		Twilight.
	04.00	AK 4953
		SSW 7, Sea SSW 6, 1/2 overcast, low-hanging clouds, Vis. good, 1006.5 mb
	08.00	AK 4994	Beginning of twilight.
		SSW 7, Sea SSW 6, mostly overcast, rain squalls, Vis. medium, 1007 mb
	08.06		Difference between dead reckoning and actual position after a navigation fix 26 nm on the course line. New position AK 4961.
	08.20	AK 4961	Dived.
	12.00	AK 4956	Day's run: Surfaced 47.2 nm, Submerged 31.5 nm = 78.7 nm
		SSW 5, Sea SSW 4, 1/2 overcast, low clouds, misty, 1007 mb
	14.07	AK 4959	Surfaced.
	16.00	AK 4988
		SW 7, Swell 4-5, 1/2 overcast, rain showers, 1010 mb
	17.52	AK 7322	Dived.
	20.00	AK 7324
		SW 7, Sea 6, 1/2-3/4 overcast, Vis. bad, 1010 mb
	24.00	AK 7319
		SSW 7, Sea 6, Cumulus, Vis. medium, 1012 mb

	22.04.44
	00.02	AK 7343	Surfaced.
	00.46		Twilight.
	03.36	AK 7371	English voice traffic heard on the Naxos receiver with Volume 3 to 4. The Fu.M.B. guest reported too late for the text
		SSW 2, Swell 6, nearly overcast, hazy horizon, 1009 mb

	Sun and Moon Data 19.04.44
	Sun and Moon Data 20.04.44
	Sun and Moon Data 21.04.44
	Sun and Moon Data 22.04.44

- 11 -



	continued
	22.04.44		to be recorded.
	03.40		Dived to listen. When switching from the 1 KVA to the 6 KVA converter the listening gear failed for 1/2 hours because the replacement fuse was too short and had to be extended by a solder joint. Listened at various water depths, no sound bearing.
	04.55	AK 7396
		SSW 2, Swell 6, overcast, horizon unclear, 1009 mb
	08.00	AK 7532	Beginning of twilight.
		SSW 2, Swell 5, completely overcast, misty, 1008 mb
	08.10		Dived.
	12.00	AK 7534	Day's run: Surfaced 67.9 nm, Submerged 42.3 nm = 110.2 nm
		SSW 3-4, rain, Vis. medium
	14.15	AK 7529	Surfaced.
	16.00	AK 7555
		WSW 4, Sea 3, low clouds, Vis. moderate, 1012 mb
	16.28	AK 7543	Dived.
	20.00	AK 7548
		SSW 0-1, Swell 2, rainy
	24.00	AK 7571
		SSW 0-1, Swell 2, nearly overcast, low clouds, horizon unclear

	23.04.44
	00.10	AK 7571	Surfaced.
	00.45		Twilight.
	04.00	AK 7732	During hourly check of Fliege and Ruddipol [Wanz and Naxos antennas respectively], Fliege is out of service. By sea impact the dipole had turned and the detector, as well as the built-in high-pass filter are broken through. Finger [older model Naxos antenna] brought out.
		SWbyW 3, Sea 2-3, 1/2 overcast, Vis. good, 1010 mb
	08.00	AK 7756	Twilight.
		WbyS 3-4, Sea 3, 3/4 overcast, low clouds, Vis. medium, 1012 mb
	08.10		Dived.
	12.00	AK 7758	Day's run: Surfaced 65.7 nm, Submerged 42.1 nm = 107.8 nm
		WbyS 3-4, Sea 3, nearly overcast, Vis. good
	13.15		Surfaced.
	13.45		Difference between dead reckoning and actual position after a navigation fix 6 nm, 57°T.
	16.00	AK 7781
		WbyS 2, Sea 2, rain shower, Vis. changing, 1021 mb
	17.29	AK 7787	Dived.
	19.15		Several depth charge series, apparently in the direct vicinity of the boat. Boat was shaken vigorously, no sound bearing, went to periscope depth. Surfaced and searched the horizon with the air targeting periscope. Nothing seen.
	19.38		Dived.
	20.00	BC 3313
		WbyS 2, 1/2 overcast, Vis. good
	24.00	BC 3315
		N 2, cross Sea, 1/2 overcast, misty, Vis. up to 2000 meters, 1021 mb

	24.04.44
	00.04	BC 3315	Surfaced.
	04.00	BC 3266
		N 4, Sea 3-4, completely overcast, rain, Vis. 1000-2000 meters, 1015 mb

	Sun and Moon Data 22.04.44
	Sun and Moon Data 23.04.44
	Sun and Moon Data 24.04.44

- 12 -



	continued
	24.04.44
	08.00	BC 3523	Twilight.
		NE 7-8, Sea 6, rain, Vis. 2000 meters, 1005 mb
	08.35		Dived.
	12.00	BC 3526	Day's run: Surfaced 77.1 nm, Submerged 41.0 nm = 118.1 nm
		SE 8, Sea 6, NE-Swell 6-7, fog
	14.00	BC 3528	Surfaced.
	14.45	BC 3528	Dived.
		Fog
	16.00	BC 3553
		SE 6-7, Sea 5-6, overcast, fog, 1005 mb
	20.00	BC 3554
		S 8, Sea 7, wafts of mist
	24.00	BC 3544
		SbyW 9-10, Sea 8-9, misty, rain showers, 994 mb

	25.04.44
	00.03	BC 3544	Surfaced.
	00.50		Twilight.
	03.56		Radio Message 1602/24/281: "To Zimmermann": Free to maneuver in are Blue ES and OV western third. Focal point off square Blue ES 1385 [BB 6315 = St. Johns] and on square 19 [BB 69 = SE of Cape Race]. If ice conditions here are unfavorable operate off square 2513 [BB 7513 = Halifax]. Situation follows.
	04.00	BC 3573	Came to westerly course. Intend to head for St. Francis initially and from there with the current and ice at periscope depth along the coast, so that the boat is positioned by day off St. Johns.
		SW 7, Sea 7, rain, Vis. medium, 995 mb
	08.00	BC 3576	Twilight.
		W 5-6, Sea 6, rain, Vis. 1 nm, 1001 mb
	08.35		Dived.
	12.00	BC 3578	Day's run: Surfaced 18.1 nm, Submerged 39.3 nm = 57.3 nm
		W 4, Sea 3-4, rain showers, Vis. medium
	15.10	BC 3577	Surfaced.
	16.10	BC 3499	Dived.
		W 4, Sea 3-4, overcast, Cumulus clouds, fog banks, 1024 mb
	20.00	BC 3498	Listening gear out of service. Condenser in II oscillating circuit of the filter amplifier is broken through. After replacement G.H.G. is in service again.
		W 3, Sea 3, rain showers, Vis. changing
	24.00	BC 3731
		WNW 2, Sea 2, overcast, Vis. medium, 1024 mb

	26.04.44
	00.15	BC 3751	Surfaced.
	00.55		Twilight. Difference between dead reckoning and actual position after a navigation fix 23 nm, 79°T.
	04.00	BC 3489
		WNW 2, Sea 2, 1/2 overcast, Vis. good, 1025 mb
	08.00	BC 3713
		WNW 2, Sea 2, overcast, rain showers, Vis. changing, 1027 mb
	08.15		Twilight.
	09.05	BC 3713	Dived.
	12.00	BC 3712	Day's run: Surfaced 52.7 nm, Submerged 39.0 nm = 91.7 nm
		S 1-2, N-Swell 2, overcast, Vis. medium
	14.00	BC 3711	Surfaced.
	16.00	BC 2935
		S 2, Sea 2, overcast, hazy horizon, 1024 mb
	17.22	BC 2926	Dived.
	20.00	BC 2925
	24.00	BC 2924
		S 4-5, Sea 4, rain, Vis. medium, 1015 mb

	Sun and Moon Data 24.04.44
	Sun and Moon Data 25.04.44
	Sun and Moon Data 26.04.44

- 13 -




	27.04.44
	00.40	BC 2929	Surfaced.
	01.10		Twilight.
	04.00	BC 2919
		S 5-6, Sea 5, rain, Vis. 2000 meters, 1011 mb
	08.00	BC 2853
		S 3-4, Sea 4, rain, Vis. changing, 1011 mb
	08.15		Twilight.
	08.47	BC 2852	Dived.
	12.00	BC 2851	Day's run: Surfaced 78.3 nm, Submerged 27.1 nm = 105.4 nm
		SSW 2, Sea 0-1, S-Swell, 5, fog, 1013 mb, Vis. 50-100 meters
	14.32	BC 2843	Surfaced.
	15.14	BC 2846	Dived.
	16.00	BC 2846	For ranges, bearings, and protective reasons the Finger was inserted into the Fliege.
		Fog
	20.00	BC 2845
		Fog
	24.00	BC 2844
		SW 2, fog, own stern can't be seen, 1016 mb

	28.04.44
	00.40	BC 2766	Surfaced.
	01.12		Twilight.
	03.40	BC 2759	Dived to listen.
	04.00	BC 2759
		SSW 2, Sea 0-1, fog, Vis. 100-200 meters
	04.45	BC 2758	Surfaced. No sound bearings.
	05.10	BC 2758	Naxos detection bearing 270°T, steady tone up to 6 seconds easy to take a bearing with Fliege. Because visibility amounts to 50-100 meters dived to listen. Slowly went to depth A +20 meters, there propeller sounds heard bearing 275°T, Volume 1-2, shifting out to 300°T and was quickly fainter. By propeller RPM vessel runs at 22-24 knots.
	05.55		Went to depth A -20 meters. Asdic sounds in listening gear swelling up and down, rhythmic knocking.
	06.15	BC 2758	Surfaced. Still thick fog. Steady detection in Naxos and Borkum gear, Volume 2-3, Fliege bearing 50°T.
	07.00	BC 2757	Detection quickly grew louder, dived. Went to depth A +10 meters. Faint propeller sounds bearing 42°T. Hogfish around us generate such strong squirming and squealing noises that the propeller sounds disappear completely. Now good visibility or an own Fu.M.G.
		SSW 1, Sea 0-1, fog, Vis. 200 meters, 1016 mb
	08.00	BC 2757
		NW 2, Sea 0-1, wafts of mist, Vis. 200-1000 meters
	09.15		Twilight. Went to periscope depth. Nothing seen. Vis, greatly changing. Went to depth A -20 meters.
	12.00	BC 2773	Day's run: Surfaced 29.6 nm, Submerged 33.9 nm = 63.5 nm
		N 2-3, Sea 1-2, fog, Vis. 500-2000 meters
	15.00	BC 2772	Surfaced.
		NE 3, Sea 2, misty, Vis. 2000-3000 meters, 1017 mb
	15.42	BC 2771	Naxos detection roughly bearing 180°T. Dived.
			No sound bearing.
	16.00	BC 2771
	20.00	BC 2771	Wanz gear can no longer be kept in service despite cannibalization of radio gear because of the lack of suitable replacement parts. Runddipol must

	Sun and Moon Data 27.04.44
	Sun and Moon Data 28.04.44

- 14 -



	continued
	28.04.44		remain switched to Borkum.
	24.00	BC 1993
		NE 2, Sea 1, fog, Vis. 1000 meters, 1018 mb

	29.04.44
	00.50	BC 1993	Surfaced.
	01.06		Difference between dead reckoning and actual position after a navigation fix 14 nm, 71°T. New square 2747.
	01.15		Twilight.
	04.00	BC 1983
		N 2, Sea 1, fog, Vis. 1000-2000 meters, 1019 mb
	08.00	BC 1899	Dived.
		N 2, Sea 1, fog, 1019 mb
	09.00		Twilight.
	12.00	BC 1898	Day's run: Surfaced 75.6 nm, Submerged 22.72 nm = 98.32 nm
		N 2, Sea 1, fog, Vis. 200 meters, water temperature 0°C
	15.57	BC 1897	Surfaced.
		N 1, Sea 1, fog, Vis. 200 nm, 1016 mb
	16.35	BC 1897	Dived.
	20.00	BC 1889
		N 1, Sea 1, fog
	24.00	BC 4222
		NE 3, Sea NE 2, fog, Vis. 1000 meters, 1008 mb

	30.04.44
	00.35	BC 4221	Surfaced.
	01.20		Twilight.
	02.28	BC 4213	Crash dive for detection Volume 5. Probably an aircraft with ASV gear. Briefly wavering, then steady tone.
	04.00	BC 4230
		E 3, Sea 2, fog, thunder showers, Vis. 2000-3000 meters, 1001 mb
	04.50	BC 4212	Surfaced.
	07.50	BC 4135
		E 3, Sea 2, fog, no Vis., 1001 mb
	12.00	BC 4129	Day's run: Surfaced 36.3 nm, Submerged 37.2 nm = 73.5 nm
	16.00	BC 4128	Surfaced. The first thick ice floes drift by. Hopefully there is finally a navigation fix.
		E 1, Sea 1, fog, no Vis.
	16.38	BC 4127	Dived.
	20.00	BC 4119
		E 2, Sea 1, fog
	24.00	BC 4118
		E 0-1, Sea 1, 1/2 overcast, misty, 1003 mb

	01.05.44
	00.15	BC 4118	Surfaced.
	01.30		Twilight.
	03.18	BC 4117	Small patrol vessel of fishing trawler bearing 268°T, range 4500 meters. Lies wonderfully as a silhouette in the moon track. I decide not to attack to to arrive off St. Johns unnoticed.
	04.00	BB 6336
		E 0-1, Sea 0, 1/2 overcast, hazy horizon, 1005 mb
	07.20	BB 6334	St. Francis Lighthouse bearing 226°T and Baccalieu Lighthouse bearing 276. Baccalieu burns as in peacetime C. St. Francis 2 flashes, 1 flash, repeats 1 minute.
	07.25	BB 6334	Due to large numerous icebergs and flows came to a southerly course at a distance of 8 nm from the coast and dived.
	08.00	BB 6334	Initially I want to be at periscope depth to observe coastal traffic, then operate by night off Cape Spear.
		E 1, Sea 1, overcast, misty, 1006 mb, heavy drift ice

	Sun and Moon Data 28.04.44
	Sun and Moon Data 29.04.44
	Sun and Moon Data 30.04.44
	Sun and Moon Data 01.05.44

- 15 -



	continued
	01.05.44
	09.00		Twilight.
	12.00	BB 6361	Day's run: Surfaced 31.4 nm, Submerged 33 nm = 64.4 nm
		NE 1, Sea 1, overcast, misty
	16.00	BB 6364
		N 2-3, Sea 1-2, overcast, hazy horizon
	18.10	BB 6367	Surfaced to ventilate. Crash dive for 4-engined aircraft flying past. Was unnoticed, range 9000 meters.
	20.00	BB 6391
		N 2-3, Sea 2, overcast, Vis. changing
	20.45	BB 6391	USA escort destroyer bearing 265°T coming from Cape Spear on course 90°, turns to course 120° 4 nm off the coast, range = 6000-7000 meters, Destroyer runs by sound bearing 18-20 knots.
	20.50		Through the periscope a Sunderland coming from the coast, course 90°, apparently reconnaissance.
	21.55	BB 6394	4 USA escort destroyers bearing 245°T, course 180°, range = 8000 meters, high speed.
	24.00	BB 6397
		SW 0-1, Sea 0, Swell, fog, Vis. 100-200 meters, 1013 mb

	02.05.44
	02.03	BB 6631	Surfaced. Came to course 0°. Positioned at the destroyer change course point. No visibility. Will again run by day with the current and ice from the north along the coast at periscope depth.
	04.00	BB 6391
		NW 2, Sea 1, fog, Vis. 100 meters, 1013 mb
	04.25	BB 7367	Dived to listen. No sound bearings.
	07.00	BB 6367	Surfaced.
	07.50	BB 6364	Naxos detection, could not take a bearing, suspect fixed land radar. Dived.
	08.00	BB 6364
		NW 1, Sea 1, fog	Came to southerly course.
	12.00	BB 6391	From time to time the coast is easily seen. Up to now no traffic observed. The ice makes it difficult to proceed at periscope depth.
		NW 2-3, Sea 2, rain, Vis. changing
			Day's run: Surfaced 31.8 nm, Submerged 41.4 nm = 73.1 nm
	16.00	BB 6394	Cape Spear abeam, if the visibility remains as it is today intend to go to St. Johns Bay tonight.
		NW 3-4, Sea 2-3, rain showers, overcast, Vis. changing good, good moon
	20.00	BB 6623
		NW 3, Sea 2, 1/2 overcast,
	24.00	BB 6628
		NNE 1-2, Sea 1, misty, Vis. 4 nm

	03.05.44
	01.30		Twilight.
	01.57	BB 6652	Surfaced. USA escort destroyer directly ahead, bearing 185°T, range = 3000 meters, target angle 0°, not seen through the periscope, there was no sound bearing. Turned away hard to port at AK, showed the stern, wendschuß [reversal shot] T 5 from tube V made ready. Target speed 8 knots, target angle right 30°, range = 2500 meters. Shooting angle 168.5°. Miss. After the shot went to both LF. Despite bright night and strong black smoke from the starboard diesel the destroyer had not sighted the boat. At target angle 60° recognized that the enemy runs at most
	02.00	NNE 1-2, Sea 1, hazy horizon, bright moon

	Sun and Moon Data 01.05.44
	Sun and Moon Data 02.05.44
	Sun and Moon Data 03.05.44

- 16 -



	continued
	03.05.44		2-3 knots, tube VI made ready.
	02.02		Range to the destroyer 1500 meters, bow right, target angle 70°. Destroyer was suddenly illuminated by an escorting land-based 4-engine aircraft type "Liberator". Overflies the destroyer, pulls up, sets stern light and flies towards the boat with a sharp left curve. Immediately opened fire with anti-aircraft weapons. The 2 cm covers [the target], hits observed, aircraft off after fire opened, overflew the boat at a distance of 100 meters, altitude 150 meters behind the stern, no bombs.
	02.05		After overflight Crash dive. Last observation aircraft turning for a second approach. Destroyer still had target angle 90°.
			Boat caught at depth A +60 meters, slowly settled further, Hit the bottom a depth 2A +7 meters. I decide to remain lying in the same position to give the destroyer no possibility of a sound bearing. Initially he goes to high speed and circles the boat.
	02.11		Bright and varying in volume turbine sounds. Suspect noise buoy. No depth charges. Destroyer must have been completely surprised and spun around. By sound bearings the destroyer disappeared in 0°T.
	03.20		2 sound bearings in 270°T Volume 2-3, shift out to 180° further to 100° up to 40°T and disappear. Must be destroyers with noise buoys. Tone like a saw, drowns out propeller sounds.
	04.56	BB 6652	Boat raised from the bottom. Moved off at depth A +20 meters on course 170°.
	07.20	BB 6656	Surfaced.
		NNE 2-3, Sea 2, overcast, in the west bright moon horizon, Vis. 4 nm
	07.40	BB 6659	Destroyer high speed, bow left bearing 280°T, broad target angle, course south, range = 4 nm. Apparently a search group. Destroyer put astern.
		Bright moonlight
	08.00	BB 6691	Destroyer out of sight.
		NNE 2-3, misty, overcast, Vis. 3 nm
	08.38		Dived.
	09.10	BB 6695	Twilight.
	10.50		Sunderland through the periscope, westerly course.
	12.00	BB 6698	Day's run: Surfaced 19.2 nm, Submerged 35.4 nm = 54.6 nm
		NE 0-1, Sea 1, Swell, fog
	16.00	BB 6697	Because I have been noticed, I decide to head for BB 69. Chances for success in the sea area around St. John are slight because:
		NE 1, Sea 0-1, fog
	20.00	BB 6931	1) Heavy drift ice and icebergs under the coast.
		NE 0-1, Swell, fog	2) Daily fog, additionally nights with bright moonlight.
	24.00	BB 6925	3) Brisk day and twilight air.
		NE 0-1, misty, Vis. 2000-3000 meters	4) In the immediate vicinity of the coast strong destroyer surveillance.
			5) Up to now no steamer traffic observed. Suspect St. John's as an escort destroyer operating harbor. Good sound conditions, better than visibility.

	04.05.44
	01.10		Twilight.

	Sun and Moon Data 03.05.44
	Sun and Moon Data 04.05.44

- 17 -



	continued
	04.05.44
	01.50	BB 6928	Surfaced. Suspect steamer traffic in the southern third of BB 69 because safe shipping avoids icebergs to the south. I want to monitor the sea area with NW and/or SE courses.
	02.00	N 0-1, Sea 0, misty, Vis. 3000 meters, 1026 mb
	04.00	BB 6928
		N 0-1, Sea 0, misty, very bright, Vis. 4000 meter, 1027 mb
	05.06	BB 6961	Dived to listen.
	05.55	BB 6964	Sound bearing in 30°T.
	06.05		Surfaced. In 20°T fishing vessels with bright lights set.
	08.00	BB 6959	Passed a large iceberg, height about 20-30 meters.
		Wind and Sea 0, fog
	08.15		Dived.
	12.00	BB 6955	Day's run: Surfaced 30.8 nm, Submerged 30.7 nm = 61.5 nm
	16.00	BB 6955	Surfaced. Iceberg 100 meters abeam, height 20 meters, length 50 meters
		Fog, wind calm
	16.45		Dived.
	20.00	BB 6958
		Fog, wind calm
	24.00	BB 9683
		Fog, wind calm

	05.05.44
	01.30		Twilight.
	02.03	BB 6983	Surfaced.
		Wind calm, fog, Vis. 50 meters, 1023 mb
	04.00	BB 6997
		Wind calm, fog, Vis. 50-100 meters, 1023 mb
	04.22	BB 6998	Dived to listen.
	05.33	BB 9332	Surfaced. Through bright moonlight water and horizon become one, no visibility. Because here there is strong current to the southwest and for days we have had no exact navigation fix, I want to advance on a northerly course to the level of Cape Race and by a sounding series to get a rough position. Attempt to take radio bearing from American transmitters fails because all their frequencies have changed.


	08.00	BB 6992
		Wind calm, heavy fog, no Vis., 1023 mb
	08.15	BB 6992	Dived.
	12.00	BB 6968	Day's run: Surfaced 36.5 nm, Submerged 26.6 nm = 63.1 nm
		Flat Sea, Vis. 100 meters
	16.00	BB 6965
		Flat Sea, fog, Vis. 100-200 meters
	16.30		Surfaced. No visibility, oily flat Sea.
	16.50	BB 6962	Dived.
	20.00	SE 0-1, Swell, thick fog
	24.00	BB 6938
		Fog, no visibility

	06.05.44
	01.30		Twilight.
	02.03	BB 6935	Surfaced.
		SE 1, Sea 1, nearly overcast, wafts of mist, bright moon
	02.30		3 shadows bearing 160°T, range = 8000 meters, very bright moonlight, maneuver ahead at the limit of visibility to attack. All bearings go to one point, the enemy must have stopped. Closed. The splendid shadows turn out to be three large icebergs. Again nothing.
	04.00	BB 6939
		SE 2, Sea 1, 1/2 overcast, bright moonlight, Vis. good, 1021 mb
	04.34		Moon navigation fix. Difference between dead reckoning and actual position 56 nm, 29°T. We must have been offset by a NE current. Came to SW course.
	04.49	BC 4457	Dived to listen.

	Sun and Moon Data 04.05.44
	Sun and Moon Data 05.05.44
	Sun and Moon Data 06.05.44

- 18 -



	continued
	06.05.44
	05.27		Surfaced.
	08.00	BC 4487
		N 2, Sea 2, overcast, misty, wafts of mist, 1021 mb
	08.47	BC 4721	Dived.
	12.00	BC 4716	Day's run: Surfaced 49.2 nm, Submerged 28.5 nm = 77.7 nm
		N 2, Sea 2, fog, Vis. 300-500 meters
	16.00	BC 4715
		N 2-3, Sea 2, overcast, wafts of mist, Vis. changing greatly, 1025 mb
	16.05		Surfaced.
	16.56	BC 4717	Dived.
	17.20		At periscope depth 2 escort destroyers 30°R, 270°T, range = 800 meters, course 0°, speed 16 knots. Disappeared quickly below the horizon.
	20.00	BC 4717
		N 2, Sea 2, 1/2 overcast, Vis. medium
	24.00	BB 6939
		N 3, Sea 2, 1/4 overcast, very bright moonlight

	07.05.44
	01.40		Twilight.
	02.15	BB 6938	Surfaced.
	03.14		Incoming Radio Message 1843/6/260: "Zimmermann" for Kommandant. 4 May daughter born. Mother and daughter in good health. Congratulations.
			Kom.Adm.Uboote
	04.00	BB 6967
		N 3, Sea 2, Stratus clouds, misty, Vis. medium, bright moonlight, 1032 mb
	04.03		Shadow, bearing 280°R, 160°T, bow left, target angle 15-20°. Comes out quickly. Came to AK and parallel course. Shadow is now easily recognized as a USA escort destroyer, zigzagging on general course 0°. Quickly comes closer despite highest speed, did not maneuver ahead across his course because of the very bright moonlight.
	04.18		Crash dived to attack. To Action Stations. All tubes made ready for submerged attack. Ran towards the destroyer at periscope depth. Further sound bearings in 330° and 25°R. At periscope depth nothing seen.
	04.32	BB 6964	T 5 from tube II on destroyer.
			Shooting data: Enemy bow left target angle 5°, enemy speed 14 knots, range = 1500 meters, depth 4 meters, aim point bow. During the shot the destroyer zigzagged to target angle 0°. After the shot the boat undercut, turned to starboard. Hit after 3 minutes 12 seconds. Very loud dull detonation. No more propeller sounds. Heavy bursting and cracking, hissing and cracking of bulkheads and the impact of large parts of the ship on the bottom depth A -10 meters. It gave the impression that the destroyer fell on the boat. Came to course 240° at depth A -20 meters. Three fast running destroyer sounds bearing 60, 100 and 160°R.
	04.38		Went to silent running. Destroyer brings out whistling buoy, very loud, constant circular saw-like, high-pitched tone. No

	Sun and Moon Data 06.05.44
	Sun and Moon Data 07.05.44

- 19 -



	continued
	07.05.44		more propeller sounds heard. Destroyers search according to plan from around the sinking location. Each destroyer steams slowly to starboard and port up to 80 and 280°R and shifts astern again. At times destroyers switch buoys off, apparently to listen. While doing so faint propeller sounds are heard. Then again slowly steaming to both sides. Up to now no depth charges.
	05.59	BB 6959	1 depth charge series. Medium range. Boat runs aground at depth A +3 meters. Remained lying in place. No Asdic sounds. Boat was overrun three times by destroyers with circular saw. To starboard in deeper water several depth charge series. I decide to remain on the bank and move off on SW course.
	08.18	BB 6959	Raised the boat from the bottom and moved off further at silent running on SW-course.
	09.30		Random aircraft bombs in the area.
	12.00	BB 6958	Destroyer sounds were fainter.
			Day's run: Surfaced 17.8 nm, Submerged 35.7 nm = 53.5 nm
	16.00	BB 6981	Went to periscope depth. Nothing more to see.
	16.15	Wind 0, Sea 0, wafts of mist, Vis. medium
	18.20		Several depth charges in the direct vicinity. Apparently thrown by an aircraft. In the distance random depth charge series.
	20.00	BB 6976
	24.00	BB 6975	Destroyer with whistle buoy circles astern.

	08.05.44
	01.40		Twilight.
	02.48	BB 6977	Surfaced.
		Wind 0, Sea 0, thick fog, 1033 mb
	04.00	BB 9236
		Thick fog, Vis. 50 meters, 1033 mb
	04.48		Dived to listen.
	05.40		Surfaced. Came to southerly course initially to move off.
			Because weather is not expected to improve in the near future I decided at the same time to go to Halifax.
	08.00	BB 9295
		S 0-1, Sea 0-1, thick fog
	08.37	BB 9295	Dived.
	12.00	BB 9298	Day's run: Surfaced 57.5 nm, Submerged 37.8 nm = 95.3 nm
	16.00	BB 9532
		S 0-1, Swell, fog, Vis. 50-100 meters, 1032 mb
	16.21		Surfaced.
	16.50		Dived.
	20.00	BB 9538
	24.00	BB 9562
		Thick fog

	09.05.44
	01.40		Twilight.
	02.15	BB 9565	Surfaced.
		S 1, Sea 0-1, fog, 1031 mb
	03.37		Incoming Radio Message 1433/8/285: 1) . . . . 2) "Zimmermann". If conditions are unfavorable extend operations area 300 nm to the south.
	04.00	BB 9567
		S 1, Sea 0-1, thick fog, 1031 mb

	Sun and Moon Data 07.05.44
	Sun and Moon Data 08.05.44
	Sun and Moon Data 09.05.44

- 20 -



	continued
	09.05.44
	08.00	BB 9837
		S 1, Sea 0-1, fog, Vis. 50-100 meters, 1031 mb
	08.38	BB 9864	Dived.
	12.00	BB 9867	Day's run: Surfaced 55.1 nm, Submerged 29.9 nm = 85.0 nm
		S 1, Sea 0-1, fog, Vis. 50 meters
	12.03		Destroyer propeller sounds in 250°R, 75°T. Went to periscope depth. Thick fog . From time to time depth sounding echo heard.
	14.10		Propeller sounds quickly grow louder, shift out ahead and disappear.
	14.45 15.15		Broad sound band from 190-240°R. Put sounds astern. Accept as a westbound convoy. To Torpedo Action Stations. All tubes made ready for submerged firing. Up to now at periscope depth no visibility due to fog. Hopefully it will break up at the decisive moment. Sounds were roaring loud, shift away quickly on both sides. In 110°R a faint shadow, sharp target angle, range = 30-50 meters, destroyer overruns the forecastle. Am in the middle of the convoy. By sound bearings to port and starboard each 2 steamers. Speed 12-13 knots. In 90 and 270°R dark gray side of ships hulls, shift out quickly. Range at most 50-75 meters, convoy drives together in double line ahead. By sound bearings 4 steamers and 4-5 destroyers. No torpedo use because no FAT, no T5 and too close range. Went to depth 20 meters, afterwards overrun once more by destroyer. Course of the convoy 250°.
	16.20	SE 1, Sea 0, fog, Vis. 50 meters	Sounds disappear.
	17.47	BB 9891	Surfaced to ventilate and give situation report because it was not heard at night by Control Center.
		S 0-1, Sea 0, fog, Vis. 50-100 meters, 1032 mb
		S 0-1, Sea 0, fog, Vis. 50-100 meters, 1032 mb	Outgoing Radio Message 0133/9/300:
			1) 3 May explained T 5 miss on destroyer BB 6652, at the same time repelled "Liberator".
			2) 7 May destroyer sunk BB 6964.
			3) Newfoundland Bank and off harbor 6385 no steamer traffic, only strong destroyer groups, brisk day and twilight air, little radar. In the entire area strong hindrance by daily fog and ice.
			4) BB 9298, 150 cbm, fog, 1032 mb.
			"Zimmermann"
	18.35	BB 9883	Dived.
	20.00	BB 9882
		SE 1, Sea 0, thick fog
	20.07		12 aircraft bombs close astern. The bearing on the Radio Message was good.
	20.12	BE 9882	Propeller sounds 10°R, 260°T.
	20.20	Fog	Propeller sounds suddenly cease and circular saw starts. Sounds were very loud. Went to periscope depth and put sounds astern. No visibility.
	20.39		Went to depth A +10 meters.
	21.00		8 aircraft bombs further off. Destroyer drives back and forth in long legs. From time to time circular saw off.

- 21 -



	continued
	09.05.44		Came to southerly course at silent running, to finally get out of the fog.
	24.00	BB 9885
		Fog

	10.05.44
	01.40		Twilight.
	01.55		Several aircraft bombs far astern. Destroyer switches circular saw off, whistle buoy on and disappears bearing 100°T.
	02.10		1) Believe that the destroyer formed a search group together with aircraft and systematically searched the bearing sector.
	[The meaning of the word "Drachen" is not clear - literally kite or dragon, perhaps meaning decoy] [The word "not" is underlined in pencil with a question mark (see original). Presumably "not" is a typo.]		2) I believe that the circular saw-like tone is a new acoustic locating and towed U-boat Drachen (Radio Message Serial No. . . .) because: a) Runs while the destroyer proceeds at very low speed. b) Tone can suddenly be switched on or off, while the destroyer continues to run. c) Sound is always constant shrill and even when overrun, one does not have the impression that the destroyer tows a Drachen.
	03.07	BB 9888
		S 0-1, Sea 0, wafts of mist, very bright moon, no Vis., 1033 mb
	04.00	CC 1316
		S 0-1, Sea 0, fog, no Vis., 1033 mb
	07.45	CC 1345	Dived.
	08.00	CC 1345
		S 0-1, Sea 0, fog	Came to SW course. Want to operate in CB 27 and 24 on the steamer route New York, Bermudas, Halifax-Cape Race and then in the new moon period to be off Halifax.
	12.00	CC 1347	Day's run: Surfaced 36 nm, Submerged 35.7 nm = 71.7 nm
		Wind 0, Sea 0, oily pond, fog
	17.31	CC 1293	Surfaced.
	18.00	CC 1293
		N 0-1, Sea 0, fog, 1035.5 mb
	18.15		Dived.
	20.00	CC 1292
	24.00	CC 1294
		NE 1, Sea 0, overcast, Vis. medium

	11.05.44
	01.40		Twilight.
	02.38	CC 1289	Surfaced.
	04.00	CC 1522
		NE 0-1, Sea 0, overcast, rain showers, Vis. changing, 1036 mb
	08.00	CC 1541
		NE 1-2, Sea 1, overcast, Vis. changing, 1036 mb
	09.07	CC 1468	Dived.
	12.00	CC 1468	Day's run: Surfaced 58.3 nm, Submerged 30.9 nm = 89.2 nm
		Rain showers
	16.00	CC 1491
	18.49	CC 1483	Surfaced.
		S 2-3, Sea 1, Cumulus clouds, 1032 mb
	19.22	CC 1468	Dived.
	20.00	CC 1486
	24.00	CC 1488
		SW 2, Sea 1, rain clouds, misty

	12.05.42
	01.44		Twilight.
	02.00	CC 1487	Surfaced.
		SW 2, Sea 1, Cumulus clouds, 1030 mb, nearly overcast

	Sun and Moon Data 09.05.44
	Sun and Moon Data 10.05.44
	Sun and Moon Data 11.05.44
	Sun and Moon Data 12.05.44

- 22 -



	continued
	12.05.44
	04.00	CC 1712	Bright marine phosphorescence
		SW 2, Sea 1, 1/2 overcast, Vis. changing, 1027 mb, air temperature +20°C, water temperature +19°C
	05.18	CC 1711	Dived to listen.
	05.32	CB 3933	Surfaced.
	06.25	CB 3935	Difference between dead reckoning and actual position after a navigation fix 18 nm, 150°T.
			New position CC 1744.
	08.00	CB 3965
		SW 2, Sea 1-2, 1/2 overcast, 1027 mb
	08.47	CB 3968	Dived.
	12.00	CB 3967	Day's run: Surfaced 44.8 nm, Submerged 29.7 nm = 74.5 nm
	16.00	CB 3998
		W 1, Sea 1, overcast, wafts of mist
	18.38	CB 3958	Surfaced.
	19.00	CB 3957
		NW 2, Sea 1, wafts of mist, overcast, Vis. changing, 1024 mb
	19.17		Dived.
	20.00	CB 3957
	24.00	CB 3949
		NW 2, Sea 1, misty, Vis. bad

	13.05.44
	01.49		Twilight.
	02.13	CB 3948	Surfaced.
	04.00	CB 3869	Strong Marine phosphorescence.
		NW 1-2, Sea 1, 1/2 overcast, hazy horizon, 1025 mb, air temperature +17.5°C, water temperature +17°C
	04.23	CB 3868	Dived to listen.
	05.11		Surfaced.
	07.08	CB 3859	Difference between dead reckoning and actual position after a navigation fix 10 nm, 345°T.
	08.00	CB 3851
		NW 2, Sea 1, overcast, rain clouds, 1022 mb
	09.21	CB 3843	Dived.
	12.00	CB 3842	Day's run: Surfaced 49 nm, Submerged 26 nm = 75 nm
	16.00	CB 3841
		N 1, Sea 0-1, Cumulus clouds, hazy horizon
	17.57	CB 3763	Surfaced.
	18.00	N 1, Sea 0-1, Cumulus clouds, Vis. medium, 1023 mb
	18.42	CB 3762	Dived.
	20.00	CB 3762
	24.00	CB 3761
		NE 1, Sea 0-1, rain clouds, Vis. medium

	14.05.44
	01.57	CB 3753
		E 2, Sea 1, rain squalls, thunderstorms, 1023 mb
	02.15		Twilight. Difference between dead reckoning and actual position after a navigation fix 13 nm, 90°T.
	04.00	CB 3752
		E 2, Sea 1, thunderstorms, 1022.5 mb
	08.00	CB 3742
		E 2, Sea 1, rain , Vis. medium, 1018 mb
	09.34	CB 3744	Twilight. Dived.
	12.00	CB 2966	Day's run: Surfaced 58.7 nm, Submerged 28.4 nm = 87.1 nm
	16.00	CB 2965
	17.02	CB 2965	Surfaced.
		SW 5, Sea 4, 1/2 overcast, Vis. medium, 10xx mb

	Sun and Moon Data 12.05.44
	Sun and Moon Data 13.05.44
	Sun and Moon Data 14.05.44

- 23 -



	continued
	14.05.44
	19.02	CB 2955	Dived.
	20.00	CB 2955
	24.00	CB 2954	After receiving "Schmöckel" situation report I decide to go to his old operations area. Came to course 310°.
		SW 5, Sea 4, thunderstorms, completely overcast

	15.05.44
	02.06	CB 2946	Surfaced.
		SW 5, Sea 4, thunderstorms and rain, 1012 mb
	02.08		Naxos detection. Dived to depth A -20 meters.
	02.15		Twilight. Several aircraft bombs abeam to starboard. Aircraft returning home safely [jettisoning bombs]
	02.26	CB 2946	Surfaced.
	04.00	CB 2918
		SW 4-5, Sea 4, thunderstorms and rain, 1012 mb
	08.00	CB 2911
		NW 4, Sea 3, 1/2 overcast, 1014 mb
	09.22	CB 2599	Navigation fix taken. Difference between dead reckoning and actual position 45 nm, 64°T.
			New square CB 2667.
	10.05	CB 2599	Dived.
	12.00	CB 2664	Day's run: Surfaced 58.2 nm, Submerged 27.7 nm = 86.9 nm
	16.00	CB 2656
	17.50	CB 2653	Surfaced.
	18.00	NW 2-3, Sea 3, 1/2 overcast, very hazy horizon, 1015 mb
	18.30	CB 2628	Dived.
	20.00	CB 2628
	24.00	CB 2624
		NW 3, Sea 2, nearly overcast, foggy horizon

	16.05.44
	02.18	CB 2616	Surfaced.
		NW 2, Sea 2, 1/2 overcast, foggy horizon, Vis. medium - moderate, 1016 mb
	02.45		Twilight.
	04.00	CB 2615
		NW 2, Sea 1, 1/2 overcast, hazy horizon, 1016 mb
	08.00	CB 2298
		W 2, Sea 1, overcast, Vis. medium
	09.34		Navigation fix taken. Difference between dead reckoning and actual position 2.8 nm, 255°T.
			Twilight.
	09.48	CB 2282	Dived.
	12.00	CB 2282	Day's run: Surfaced 53.7 nm, Submerged 31.5 nm = 85.2 nm
	16.00	CB 2257
	17.12		Surfaced.
	17.54	CB 2246	Dived.
		W 0-1, Sea 0, misty, 1017 mb
	20.00	CB 2246
	24.00	CB 2246
		SE 2, Sea 1, fog, Vis. 10 nm

	17.05.44
	02.36		Twilight. In large square CB 22 active day air.
	02.51	CB 2241	Surfaced.
		SE 2, Sea 1, fog, Vis. 100 meters, 1017 mb
	04.00	CB 2135
		SE 2-3, Sea 2, fog, Vis. 100 meters, 1014 mb, bright marine phosphorescence
	08.00	BB 7857
		SE 2-3, Sea 2, fog, Vis. up to the forecastle, 1011 mb
	08.57	BB 7854	Dived.

	Sun and Moon Data 14.05.44
	Sun and Moon Data 15.05.44
	Sun and Moon Data 16.05.44
	Sun and Moon Data 17.05.44

- 24 -



	continued
	17.05.44
	12.00	BB 7854	Day's run: Surfaced 49.6 nm, Submerged 32.8 nm = 82.4 nm
		Thick fog, no Vis.
	12.15		Propeller sounds bearing 40°T, 40°R, Volume 1-2. At periscope depth, fog Vis. 100 meters.
	12.40		Propeller sounds shift out to 25°T quickly grew louder. Turbine. If it is a destroyer then he runs 14 knots by RPM. Adsic sounds or similar sharp crack of the whip with an echo. (Might also be a sounder)
	12.42		To Action Stations, Hopefully he comes in sight.
	12.55		Sounds shift out quickly over 0 to 350°T and disappear. Had he done so [come in sight], there is still one T5, going by the volume of the propellers.
	16.00	BB 7854	In the vicinity sporadic aircraft bombs.
		Fog, Vis. 100-200 meters
	19.59	BB 7851	Surfaced, Above us clear blue sky. Only ground fog.
		SE 0-1, Sea 0-1, fog, Vis. 100 meters, 1012 mb
	20.17		Dived.
	20.20		2 depth charges in the direct vicinity. Boat was shaken strongly.
	24.00	BB 7819
		S 2, Sea 1, fog	Apparently we were detected by aircraft. With immediate check of the Fliege, a cable break 10 cm below the housing was determined.

	18.05.44
	02.20		Twilight.
	03.03	BB 7616	Surfaced.
	04.00	BB 7816	Strongly phosphorescent water.
		SW 2, Sea 1, scattered vapor clouds, foggy horizon, Vis. 2000 meters, 1010 mb
	05.37	BB 7579	Dived to listen.
	05.45		Sound bearing in 25°T.
	06.05		Surfaced, pursued on sound bearing, fishing trawler on southwesterly course.
	08.00	BB 7579
		SW 2, Sea 1, 1/2 overcast, very hazy horizon, 1010 mb
	09.15		Twilight.
	09.28	BB 7813	Dived.
	12.00	BB 7579	Day's run: Surfaced 40.5 nm, Submerged 34.6 nm = 75.1 nm
		Thick fog
	16.00	BB 7587
		Fog, Vis. 50-100 meters
	18.59	BB 7580	Surfaced.
		SW 2, Sea 1, fog, Vis. 1000 meters, 1004.4 mb
	19.15		Dived.
	20.00	BB 7585
	21.19		Difference between dead reckoning and actual position after a navigation fix 14 nm, 18°T. New square 7559.
	21.49	BB 7556	At periscope depth a steamer, bow left, target angle 80°, range = 10000 meters. Course 300. Aircraft (seaplane) circles over the steamer.
	24.00	BB 7556

	19.05.44
	02.40		Twilight.
	02.50	BB 7564	Surfaced. 2 lighthouses bearing 285°T and 3°T. In 300°T very bright glow,
		SW 3, Sea 2, 1/2 overcast, hazy horizon, 1017 mb

	Sun and Moon Data 21.05.44
	Sun and Moon Data 22.05.44
	Sun and Moon Data 23.05.44

- 25 -



	continued
	19.05.44		shining over the entire horizon. I believe it is Halifax or a searchlight barrier.
	04.00	BB 7568
		SW 3, Sea 2, very hazy horizon, 1016 mb
	05.10	BB 7596	Dived to listen.
	05.20		Sound bearing in 30°R, 180°T.
	05.46		Surfaced. Pursued on sound bearing.
	06.35	BB 7833	Fishing trawler in sight with bright lights set. Turned away and came to westerly course.
	07.00	BB 7832	Aircraft with set lights in 300°R, range = 4000 meters. Rough course 180°. Was not seen, did not dive.
	08.00	BB 7598	Passed fishing trawler in 270°R.
	08.45	SW 2, Sea 1, hazy horizon, 1016 mb
	09.00		Twilight.
	09.03	BB 7596	Dived.
	12.00	BB 7595	Day's run: Surfaced 53 nm, Submerged 30.4 nm = 83.4 nm
	16.00	BB 7595
		SW 2, Sea 1, 1/2 overcast, clear horizon
	20.00	BB 7594
		SW 2, Sea 1, 1/2 overcast, wind driven clouds, hazy horizon
	20.10		Surfaced.
	20.23		Dived.
	24.00	BB 7586
		SW 4, Sea 2-3, hazy horizon

	20.05.44
	02.40		Twilight
	02.52	BB 7586	Surfaced.
	03.04	BB 7585	Difference between dead reckoning and actual position after a navigation fix 11.5 nm, 330°T.
			New square BB 7581
	04.00	BB 7573
		SW 4, Sea 3, hazy horizon, 1015 mb
	05.18	BB 7572	Dived to listen.
	06.00		Surfaced. No sound bearings. Am going to square 78, on 17 May had the most sound bearings there. Suspect more traffic there.

	Sun and Moon Data 21.05.44
	Sun and Moon Data 22.05.44
	Sun and Moon Data 23.05.44

- 26 -



	continued
	20.05.44
	08.00	BB 7812
		SW 3, Sea 2, vapor clouds, 1015 mb
	09.00		Twilight.
	09.25	BB 7815	Dived.
	12.00	BB 7842	Day's run: Surfaced 42.7 nm, Submerged 35.7 nm = 78.4 nm
		SW 2-3, Sea 1, wind driven clouds
	20.00	BB 7854
		SW 2, Sea 1, clear horizon, 1015 mb
	20.12		Surfaced.
	20.20		Mastheads in 95°R, 185°T, bow left, range 12 nm, roughly course 110°, broad target angle.
	20.22		Aircraft, type "Liberator", in 260°T coming out of the sun, Crash dive. Went to depth A +10 meters, no bombs. Shortly thereafter propeller sounds heard in listening gear.
	20.40		Went to periscope depth, aircraft still circling on the horizon.
	22.10	BB 7855	Propeller sounds in 40°R, 130°T. Went to periscope depth. Small fishing trawler course 200, range = 6000 meters.
	24.00	BB 7855
		SW 2, Sea 1, vapor clouds, hazy horizon.

	21.05.44
	02.40		Twilight.
	02.50	BB 7855	Surfaced.
	04.00	BB 7858
		W 3, Sea 2, hazy horizon, 1014.5 mb
	05.15	BB 7857	Dived to listen.
	05.50	BB 7854	Surfaced.
	08.00	BB 7881
		W 3, Sea 2, hazy horizon, 1014.5 mb
	09.10		Twilight.
	09.45	BB 7873	Dived.
	12.00	BB 7872	Day's run: Surfaced 48.5 nm, Submerged 31.4 nm = 79.9 nm
		W 1, Sea 0-1, hazy horizon
	16.00	BB 7872	Passed fishing trawler, range 3000 meters, course 20°.
	20.00	BB 7881
		W 3, Sea 2, 1/2 overcast, 1014.5 mb
	20.02		Surfaced.

	Sun and Moon Data 20.05.44
	Sun and Moon Data 21.05.44

- 27 -



	continued
	21.05.44
	20.13	BB 7881	Crash dive for aircraft, bearing 0°T, 90°R, "Liberator" very high, flew past.
	24.00	BB 7873
		W 2-3, Sea 2, vapor clouds, hazy horizon

	22.05.44
	02.30	BB 7872	Surfaced.
	02.40		Twilight.
	02.32		Difference between dead reckoning and actual position after a navigation fix 5 nm, 112°T.
	04.00	BB 7881
		W 2-3, Sea 2, Cumulus clouds, Vis. good, 1014 mb
	05.32	BB 7883	Dived to listen.
	05.59		Surfaced.
	08.00	BB 7855	Fishing trawler on northerly course passed to starboard range 2000 meters.
		W 2-3, Sea 2, 1/4 overcast, Vis. good, 1014.5 mb
	09.10	BB 7854	Twilight.
	09.18		Dived.
	12.00	BB 7827	Day's run: Surfaced 62.5 nm, Submerged 32.8 nm = 95.3 nm
	16.00	BB 7827
		W 1-2, Sea 1, wind clouds, hazy horizon, Vis. medium
	16.40		Several depth charge series astern, went to periscope depth, aircraft type "Liberator" course north, very high. Up to 23.54 hours nearly every half hour aircraft bombs and depth charges, seemingly close by.
	20.00	BB 7827	At periscope depth nothing seen.
	24.00	BB 7852	Incoming Radio Message 2231/22/270
			According to report Allied merchant steamers were shot by a U-Boat at 16.40 hours in naval square BB 7850. This can only have been Beilfeld, therefore this was the bomb blessing in the area.

	Sun and Moon Data 21.05.44
	Sun and Moon Data 22.05.44

- 28 -




	23.05.44
	02.40		Twilight.
	02.44	BB 7852	Surfaced. Going to square 75.
		SW 2, Sea 1, misty, Vis. medium, 1012 mb
	04.00	BB 7828
		SW 2, Sea 1, heavy mist, Vis. medium, 1012 mb
	04.12		Avoided a brightly illuminated fishing trawler.
	05.39	BB 7826	Dived to listen, only the propeller sounds of fishermen are heard.
	06.00		Surfaced.
	07.00	BB 7826	A small patrol vessel, initially taken for a fishing trawler sighted directly ahead. Went around him at range 3000 meters. Bright side and stern lights. When abeam until out of sight lit up with a red light, patrol vessel always turned towards.
	08.03		Strong swoosh ahead, 3 seconds later was overflown by a "Liberator" with a shut down engine altitude 100 meters. Because there was no detection [radar], and apparently we were not seen, remained on the surface.
	08.10		2 parachute flares astern, range 1000 meters. Additionally, aircraft sighted transverse to our course. Crash dived, no bombs.
	12.00	BB 7598	Day's run: Surfaced 39.8 nm, Submerged 33.1 nm = 72.9 nm
		NE 1, Sea 0-1
	16.00	BB 7594
	20.00	BB 7559	Went to periscope depth.
		NE 0-1, Sea 0, clear horizon, oily flat Sea
	22.31	BB 7556	Partial convoy, 4 steamers bearing 290°T, 290°R, range 9000 to 10000 meters. Bow left, target angle 90°, enemy course 200°. Additionally 2 Liberators, circle the convoy at 2000 meters altitude.
	23.16		3 seaplanes of type "Catalina" altitude 600 meters flying back and forth off the coast.

	24.05.44
	03.00		Twilight.
	03.12	BB 7553	Surfaced.
	03.14		Crash dive for inbound aircraft, with set lights. Range 5000 meters. While getting inside aircraft was seen to veer slightly. No bombs.
	04.00	BB 7556	Surfaced.
		Wind calm, Sea 0, 1/2 overcast, 1022 mb
	04.18	BB 7557	Sambro Lighthouse bearing 332°T, flashing repeats 5 seconds.
			Devils Island Light bearing 347°T, shines 5 seconds.
			Chebucto Head Lighthouse bearing 339°T flashing.
			Halifax Lightship East bearing 13°T, blinks.
			Because it was very high out, I suspect it has shifted to 44° 22.5'N, 63° 13.4'W.
			Sambro Lightship is extinguished. From observations of the in and outbound steamers and fishermen the entry course from the 100-meter line is 300-310°.

	Sun and Moon Data 23.05.44
	Sun and Moon Data 24.05.44

- 29 -



	continued
	24.05.44
	07.18	BB 7578	Dived to listen.
	08.00	BB 7578	Surfaced, several searchlights over the coast.
		Wind calm, Sea 0, wafts of mist, 1022 mb
	09.00	Twilight.
	09.16		Dived.
	09.16		From observations up to now there is no night traffic. Only by day with strong air. Initially I will hold on the detected convoy route.
	12.00	BB 7812	Day's run: Surfaced 36.0 nm, Submerged 37.5 nm = 73.5 nm
		Wind calm, oily flat sea, hazy horizon
	13.57	BB 7813	Several sound bearings in 340°R, 10°T. Went to periscope depth, Aircraft type "Liberator", altitude 2000 meters flies from left to right. No mastheads seen.
		Wind calm, Sea 0, hazy horizon
	16.00	BB 7813	At periscope depth several fishermen seen.
		Wind calm, Sea 0, hazy horizon
	20.00	BB 7822
	24.00	BB 7821
		SE 0-1, Sea 0, hazy horizon

	25.05.44
	02.50	BB 7812	Twilight, surfaced.
	04.00	BB 7811
		SE 1-2, Sea 0-1, hazy, 1027 mb
	05.24	BB 8712	Dived to listen.
	05.54		Surfaced.
	08.00	BB 7813
		SE 1-2, Sea 0-1, hazy, 1027 mb
	08.50		Twilight.
	09.10	BB 7821	Dived.
	12.00	BB 7821	Day's run: Surfaced 50.2 nm, Submerged 39.6 nm = 89.8 nm
		Wind calm
	16.00	BB 7579
		Wind calm, Sea 0, leaden sea, hazy horizon
	17.00	BB 7813	Propeller sounds bearing 100°R, 190°T. At periscope depth two mastheads seen. Bow right target angle 30°. Range roughly 6 nm. Angled in on a collision course with both. At target angle 10° recognized as a small fisherman that due to the strong horizon mirroring of his masts appeared as a larger freighter. In 330°T a departing aircraft, type not recognized.

	20.00	BB 7582
		Wind calm, Sea 0, hazy horizon
	21.07	BB 7813	Propeller sounds in 350, and 345°R. At periscope depth initially nothing seen.
	22.00		2 English escort destroyers with bow left 80 and 30°, range 8000 meters, speed 18 knots. Come out of the hazy horizon. Zigzagging every 2-3 minutes about 13-14. General course 210°. No attack possibility. Assume I have 2 remote escorts of a convoy before me, did not materialize.
	24.00	BB 7587
		Sea 0, misty

	Sun and Moon Data 24.05.44
	Sun and Moon Data 25.05.44

- 30 -




	26.05.44
	02.45		Twilight.
	03.03	BB 7587	Surfaced.
		Misty, 1027 mb
	04.00	BB 7813	Through large horizon mirroring blinking Coffin Island Lighthouse bearing 289.8°T. In addition bright searchlights from time to time search the water surface.
		S 0-1, Sea 0, misty, 1027 mb
	08.00	BB 7849
		S 0-1, Sea 0, wafts of mist, 1027 mb
	09.00		Twilight.
	09.15	BB 7873	Dived.
	12.00	BB 7876	Day's run: Surfaced 53.7 nm, Submerged 39.6 nm = 93.3 nm
	16.00	BB 7879
		SE 1, Sea 0-1, wafts of mist
	20.00
	24.00

	27.05.44
	02.40		Twilight.
	02.50	CB 2129	Surfaced.
		S 0-1, Sea 0, fog, 1026 mb
	04.00	CB 2155
		S 0-1, Sea 0, wafts of mist, 1026 mb
	05.21	CB 2182	Dived to listen.
	06.09		Surfaced.
	08.00	CB 2187
		S 0-1, Sea 0, fog, 1026 mb
	09.50		Twilight.
	09.41	CB 2419	Dived.
	12.00	CB 2242	Day's run: Surfaced 57.8 nm, Submerged 34.6 nm = 92.4 nm
		S 1, Sea 0-1, Swell, wafts of mist
	16.00	CB 2445
		SSW 2, Sea 1, Cumulus clouds, Vis. good
	17.37	CB 2448	Surfaced.
	18.37		Incoming Radio Message 1601/27/235
			Zimmerman begin return transit. Report situation as soon as sufficiently set off.
	18.50	CB 2471	Began return transit.
		SSW 2-3, Sea 2, scattered Cumulus clouds, 1024 mb, Vis. good
	19.16		Dived.
	20.00	CB 2472
	24.00	CB 2473
		SSW 2, Sea 1, rain showers, Vis. medium

	28.05.44
	02.00	CB 2481	Surfaced.
		SSW 2, Sea 1, rain clouds, 1026 mb, Vis. good
	02.10		Difference between dead reckoning and actual position after a navigation fix 29 nm, 160°T. New position CB 2729.
	02.40		End of twilight.
	04.00	CB 2739
		SSW 2, Sea 1, scattered Cumulus clouds, Vis. good
	05.12	CB 2818	Dived to listen.
	05.58	CB 2819	Surfaced.
	08.00	CB 2825
		SSW 3, Sea 2, nearly overcast, 1026 mb, bright marine phosphorescence.

	Sun and Moon Data 26.05.44
	Sun and Moon Data 27.05.44
	Sun and Moon Data 28.05.44

- 31 -



	continued
	28.05.44
	09.00		Twilight.
	09.22	CB 2831	Dived.
	12.00	CB 2832	Day's run: Surfaced 82.2 nm, Submerged 29.1 nm = 111.3 nm
		S 1, Sea 0-1, SW-Swell, Vis. medium
	16.00	CB 2677
		S 0-1, Sea 0, misty
	17.59	CB 2678	Surfaced.
	18.03		Mastheads in 300°R, 10°T, range 9 nm. Put astern to maneuver ahead. Despite AK the vessel quickly comes over the horizon and is easily recognized as a destroyer. Bow left, target angle 5°.
	18.18		Dived to attack.
	18.25		At periscope depth destroyer is still not seen. No sound bearings.
			Proceeded at depth 10 meters, air search periscope totally extended. Nothing more is seen. Destroyer must have turned away.
	19.12	CB 2678	Surfaced. Pursued on the old bearing. Took all around sweeps in the air search periscope, horizon is clear.
	20.30	CB 2676	I believe that the destroyer sighted us and ran off at highest speed. Dived because now aircraft can be expected.
		S 0-1, Sea 0, scattered Cumulus clouds, Vis. good, 1021 mb
	24.00	CB 2685
		SW 2, Sea 1, overcast, Vis. medium

	29.05.44
	01.49	CB 2683	Surfaced. Difference between dead reckoning and actual position after a navigation fix 24 nm, 69°T.
	02.01	SW 2, Sea 1, overcast, Vis. medium, 1016 mb
		SW 2, Sea 1, overcast, Vis. medium, 1016 mb	New position CB 3448.
	02.30		End of twilight.
	04.00	CB 3455
		SW 2, Sea 1, completely overcast, 1016 mb
	08.00	CB 3315	Strong marine phosphorescence.
		NW 3, Sea 2, rain showers, 1016 mb, air temperature +22°C, water +19°C
	08.30		Twilight.
	09.10		Dived.
	12.00	CB 3524	Day's run: Surfaced 72.9 nm, Submerged 33.7 nm = 106.6 nm
		N 0-1, Sea 0, NW-Swell, scattered Cumulus clouds, hazy horizon
	16.00	CB 3522
	17.12	CB 3523	Surfaced.
		NE 4, Sea 3, scattered fleecy clouds, Vis. good
	19.02	CB 3299	Dived.
	20.00	CB 3299
	24.00	CB 3374
		NE 2, Sea 1, hazy horizon

	30.05.44	Sable Island
	01.42	CB 3375	Surfaced.
	01.50	NE 3, Sea 2, hazy horizon, 1022 mb	Difference between dead reckoning and actual position after a navigation fix 14 nm, 90°T.
			New position CB 3385
	02.30		End of twilight.

	Sun and Moon Data 28.05.44
	Sun and Moon Data 29.05.44
	Sun and Moon Data 30.05.44

- 32 -



	continued
	30.05.44
	04.00	CB 3369
		NE 2, Sea 1, misty, 1022 mb
	07.30		Attempted to send situation report to Control was not heard.
	08.00	CC 1161
		NE 2, Sea 1, closed cloud layer, Vis. medium, 1025 mb
	08.15		Twilight.
	08.56	CC 1162	Dived.
	12.00	CC 1163	Day's run: Surfaced 80.4 nm, Submerged 32.0 nm = 112.4 nm
		E 1, Sea 0-1, misty, Vis. medium
	16.00	CC 1242
		SE 2, Sea 1, misty, Vis. medium
	16.54		Surfaced. Attempted to send the situation report again, was not heard.
	17.39	CC 1251	Dived.
		SE 2-3, Sea 2, misty, 1025 mb
	20.00	CC 1251	Fliege again in service. the following faults have arisen:
			1) By moisture the high pass filter rusted so that the detector did not have continuity.
			2) The socket for headphone cable is broken, so that sounds are only audible when shaken a bit from time to time.
			3) Continuous cable breaks at the conduit in the Fliege housing.
	24.00	CC 1253
		SW 2, Sea 1-2, scattered Cumulus clouds, foggy horizon

	31.05.44	South of the Newfoundland Bank
	01.00	CC 2161	Surfaced.
	01.55	SW 3, Sea 2, scattered cumulus clouds, foggy horizon, 1025 mb	Difference between dead reckoning and actual position after a navigation fix 22 nm, 271°T.
			New position CC 1219.
	02.15		Twilight.
	04.00	CC 1229
		SW 3, Sea 2, 1/2 overcast, Vis. medium, 1024 mb
	07.20		Attempted to send situation report again, initially heard by Control at Volume 3, after giving 80 groups interrupted by Control because the Radio Message could only received at Volume 2.
	08.00	CC 1319
		SW 3, Sea 2, hazy horizon, 1021 mb
	08.10		Dived.
	12.00	CC 1328	Day's run: Surfaced 64.9 nm, Submerged 36.5 nm = 101.4 nm
		SW 2-3, Sea 2, overcast, foggy horizon, Vis. medium
	16.00	CC 1329
	16.30	SW 3, Sea 2, overcast, foggy horizon, 1017 mb	Surfaced.
	16.50	CC 1329	Dived.

	Sun and Moon Data 30.05.44
	Sun and Moon Data 31.05.44

- 33 -



	continued
	31.05.44	South of Newfoundland
	20.00	CC 1337
	24.00	CC 1339
		SSE 2-3, Sea 2, overcast, hazy horizon

	01.06.44
	01.30	CC 1339	Surfaced.
		SSE 4, Sea 3, overcast, Vis. medium, 1012 mb
	04.00	CC 2127
		SSE 4, Sea 3, overcast, Vis. medium. 1012 mb
	07.00		Attempted to send situation report again, time group was confirmed after 10 minutes, after giving the first 40 groups was interrupted again by Control and declared impossible to receive.
	08.32	CC 2218
	12.00	CC 1219	Day's run: Surfaced 63.8 nm, Submerged 35.8 nm = 99.6 nm
		Wafts of mist
	16.00	CC 2227
	16.32	CC 2227	Surfaced.
		SSW 3-4, Sea 3, overcast, foggy horizon, Vis. changing
	17.01	CC 2228	Dived.
	20.00	CC 2229
	24.00	CC 2237
		SSW 3, Sea 2, fog

	02.06.44
	01.22	CC 2238	Surfaced.
		SSW 3, Sea 2, fog, Vis. 50 meters, 1011 mb
	02.00		Twilight.
	04.00	CC 2318
		SSW 3, Sea 2, fog, 1011 mb
	08.00	CC 2339	Twilight.
		SSW 1-2, Sea 1, fog, Vis. 50-100 meters, 1011 mb
	08.40	CC 3117	Dived.
	12.00	CC 3118	Day's run: Surfaced 69.2 nm, Submerged 33.4 nm = 102.6 nm
		SSW 3, Sea 2, wafts of mist, Vis. changing
	16.00	CC 3118
	16.35	CC 3127	Surfaced.
		SW 4-5, Sea 3, fog, Vis. 10 nm, 1012 mb
	16.57	CC 3127	Dived.
	20.00	CC 3128
	24.00	CC 3137
		SW 3, Sea 2, fog

	03.06.44
	01.11	CC 3137	Surfaced.
		SW 3-4, Sea 3, fog, Vis. 100 meters, 1016 mb
	01.50		Twilight.
	04.00	CC 3224
		SW 4, Sea 3, fog, Vis. changing, up to 1000 meters, 1018 mb
	08.00	CC 3311	Twilight.
		SW 4, Sea 3, fog, 1018 mb

	Sun and Moon Data 31.05.44
	Sun and Moon Data 01.06.44
	Sun and Moon Data 02.06.44
	Sun and Moon Data 03.06.44

- 34 -



	continued
	03.06.44	South of the Newfoundland Bank
	08.39	CC 3312	Dived.
	12.00	BC 8779	Day's run: Surfaced 72.2 nm, Submerged 36.3 nm = 108.5 nm
	16.00	BC 8787
	16.30	BC 8787	Surfaced.
		SW 3, Sea 2, wafts of mist, Vis. changing
	16.50		Dived.
	20.00	BC 8789
	24.00	BC 8795
		SSW 4-5, 1/2 overcast, wafts of mist

	04.06.44	Southeast of the Newfoundland Bank
	00.59	BC 8795
		SSW 4-5, Sea 3-4, wafts of mist, Vis. changing, 1020 mb
	01.04		Difference between dead reckoning and actual position after a navigation fix 38 nm, 77°T.
	01.45		Twilight.
	04.00	BC 8869
		SSW 4, Sea 3, 1/2 overcast, Vis. good, 1020 mb
	07.58		Finally established communications with the homeland on America II Circuit.
			Outgoing Radio Message 0221/4
			1) 18 May BB 7556 independent course 300°.
			20 May 7854 fast independent course SE
			23 May 7556 partial convoy course 200°.
			24 May 7813 by sound bearings partial convoy NW-course medium speed.
			25 May 7813 2 escort destroyers, 14° zigzag around SW course, high speed.
			2) In area traffic only by day with strong air, high flying. 23 May 7828 illuminated by patrol vessel with red light, afterwards overflown by liberator escorting convoy. Only parachute flares
			3) No detection determined, Fliege out of service.
			4) Land beacons burn as in peacetime.
			5) BC 88, 95 cbm, SW 2, 1012 mb.
			"Zimmermann"
	08.00	BC 8956
		SW 4-5, Sea 4, wafts of mist, 1019 mb
	08.10	BC 8956	Dived.
	12.00	BC 8962	Day's run: Surfaced 71.2 nm, Submerged 38.5 nm = 109.7 nm
	16.00	BC 8963
	16.29	BC 9741	Surfaced.
		SSW 6, Sea 5, overcast, fog clouds, Vis. medium, 1019 mb
	16.52		Dived.
	20.00	BC 9742
	24.00	BC 9727
		SSW 6, Sea 5-6, overcast, rain showers

	05.06.44
	00.53	BC 9727
		SSW 6, Sea 6, overcast, rain showers, 1016 mb
	01.30		Twilight

	Sun and Moon Data 03.06.44
	Sun and Moon Data 04.06.44
	Sun and Moon Data 05.06.44

- 35 -



	continued
	05.06.44	Southeast of the Newfoundland Bank
	04.00	BC 9736
		SSW 6-7, Sea 6, overcast, 1015 mb
	07.45		Twilight.
	07.50	BC 9823	Dived.
	08.00	BC 9823
		SSW 6-7, Sea 6, rain showers, 1015 mb
	12.00	BC 9832	Day's run: Surfaced 69.4 nm, Submerged 33.4 nm = 102.8 nm
	16.00	BC 9599
	16.27	BC 9677	Surfaced.
		SSW 7-8, Sea 7, rain, 1013 mb
	16.58		Dived.
	20.00	BC 9678
	24.00	BC 9684
		N 4, Sea 2, SSW-Swell 4, rain

	06.06.44	North Atlantic
	00.30	BC 9684	Surfaced.
		N 4-5, Sea 2, SSW-Swell 4, rain, no Vis., 1018 mb
	01.15		Twilight.
	04.00	BC 9693
		NW 3-4, Sea 3, SSW-Swell 3, overcast, rain showers, 1020 mb
	07.30		Twilight.
	07.45	BD 7459	Dived.
	08.00	BD 7459
		NW 3-4, Sea 3, overcast, rain showers, 1020 mb
	12.00	BD 7468	Day's run: Surfaced 68.0 nm, Submerged 33.2 nm = 101.2 nm
	15.03	BD 7466	Surfaced.
		NW 4, Sea 4, 1/2 overcast, Cumulus clouds, 1024 mb
	15.25		Dived.
	16.00	BD 7466
	20.00	BD 7545
	24.00	BD 7546

	07.06.44	North of the Azores
	00.19	BD 7546
		NW 3, Sea 2, 1/2 overcast, rain showers, 1016 mb
	01.00		Twilight. Difference between dead reckoning and actual position after a navigation fix 40 nm, 200°T.
			New square 7815.
	02.23		Incoming Radio Message: 1846/6/246
			Zimmermann, Dobberstein, Sammler additionally report weather tonight.
	04.00	BD 7831
		NW 3, Sea 2, overcast, 1026 mb
	06.06		Outgoing Radio Message: Short Signal weather report 0606
			43°N, 36°W, rising, up to 3/4 overcast, fleecy clouds, mainly cloudy to overcast, abating winds, Vis. 10 nm, NW-wind, NW-Swell has decreased, moderately high, medium-long, +16°C, air temperature lower than water temperature 0.1-0.5°C.
			U-548

	Sun and Moon Data 05.06.44
	Sun and Moon Data 06.06.44
	Sun and Moon Data 07.06.44

- 36 -



	continued
	07.06.44
	07.10		Twilight.
	07.57	BD 7679	Dived.
		NW 2, Sea 3, overcast, 1026 mb
	12.00	BD 7688	Day's run: Surfaced 75.9 nm, Submerged 31.0 nm =106.9 nm
	15.11	BD 7686	Surfaced.
		NW 2, Sea 2, scattered Cumulus clouds, Vis. medium, 1027 mb
	15.24	BD 7694	Dived.
	20.00	BD 7695
	24.00	BD 8471
		WNW 2-3, Sea 2, overcast, Vis. medium, 1026 mb

	08.06.44	North of the Azores
	00.16	BD 8471	Surfaced.
	00.26		Incoming Radio Message: 125/7/253
			On 8 June at 08.00 hours Petersen and Zimmermann switch to Ireland Circuit, U-530 America II Circuit. Büchel America III Circuit.
	00.55		Twilight.
	04.00	BD 8467
		NW 3, Sea 2, overcast, Vis. medium, 1025 mb
	07.00		Twilight.
	07.45	BD 8543	Dived.
		NW 4, Sea 3, overcast, rain clouds, 1025 mb
	12.00	BD 8552	Day's run: Surfaced 75.4 nm, Submerged 30.6 nm =106.0 nm
	15.06	BD 8529	Surfaced.
		WNW 5, Sea 4-5, overcast, Vis. medium, 1023 mb
	15.25		Dived.
	16.00	BD 8537
	20.00	BD 8538
		WNW 4, Sea 4, Swell, overcast, Vis. medium
	24.00	BD 8614
		NW 4, Sea 3, overcast, Vis. medium, 1023 mb

	09.06.44
	00.10	BD 8614	Surfaced.
	00.58		Incoming Radio Message: 1100/8/181
			Zimmermann, Sammler, Grau additionally report weather tonight.
	04.00	BD 8631
		NW 4, Sea 3, overcast, Vis. medium, 1024 mb
	04.57		Outgoing Radio Message: Short Signal weather report
			44°N, 28°W, air pressure falling 1024 mb, nearly to completely overcast with strong winds, Vis. 5 nm no fog, NW-wind 2, NW-Swell 2-4, medium-long, 40-150 meters, air +18°C, difference 2°C.
			U-548
	06.30		Twilight.
	07.00	BD 9176
		NW 3, Sea 2, overcast, Vis. medium, 1023 mb
	08.00	BD 9176

	Sun and Moon Data 07.06.44
	Sun and Moon Data 08.06.44
	Sun and Moon Data 09.06.44

- 37 -



	continued
	09.06.44	North of the Azores
	12.00	BD 9185	Day's run: Surfaced 75.6 nm, Submerged 32.1 nm =107.7 nm
	15.16	BD 9186
		NW 2, Sea 2, overcast, Vis. medium, 1023 mb
	15.58	BD 9191	Dived.
	20.00	BD 9192
	24.00	BD 9247
		NW 3, Sea 2, overcast, hazy horizon, 1023 mb

	10.06.44
	00.10	BD 9247	Surfaced.
	00.45		Twilight.
	01.08	BD 9249	Difference between dead reckoning and actual position after a navigation fix 80 nm, 282°T.
			New position BD 9117.
	04.00	BD 9125
		NW 2, Sea 2, overcast, Vis. medium, 1023 mb
	06.30		Twilight.
	07.03	BD 6877
		NW 2, Sea 2, overcast, foggy horizon, 1023 mb
	08.00	BD 6877
	12.00	BD 7878	Day's run: Surfaced 80.6 nm, Submerged 31.2 nm =111.8 nm
	15.22	BD 6897	Surfaced.
		W 3, Sea 3, scattered Cumulus clouds, Vis. good, 1020 mb
	15.55		Dived.
	20.00	BD 6887
	24.00	BD 6888	Surfaced.
		W 2, Sea 2, overcast, Vis. medium, 1020 mb

	11.06.44	North of the Azores
	04.00	BD 6979	Very bright marine phosphorescence.
		SW 2, Sea 1-2, overcast, 1020 mb, Vis. medium, air temperature +19°C, water +17°C
	06.20		Twilight.
	06.44	BD 6999	Dived.
		SW 2, Sea 4-2, overcast, 1020 mb, foggy horizon
	08.00	BD 6999
	12.00	BE 4777	Day's run: Surfaced 88.1 nm, Submerged 29.4 nm =117.5 nm
	15.18	BE 4778	Surfaced.
		N 3, Sea 2, overcast, 1022 mb, Vis. low, fog
	15.41		Dived.
	16.00	BE 4779
	20.00	BE 4779
	23.35	BE 4787	Surfaced.
	24.00	S 2, Sea 1-2, overcast, 1023 mb, hazy horizon

	12.06.44
	00.40	BE 4789	Twilight.
			Difference between dead reckoning and actual position after a navigation fix 22 nm, 128°T.
			New position BE 7135.
	04.00	BE 7225
		SW 2, Sea 2, 1/2 overcast, 1023 mb

	Sun and Moon Data 09.06.44
	Sun and Moon Data 10.06.44
	Sun and Moon Data 11.06.44
	Sun and Moon Data 12.06.44

- 38 -



	continued
	12.06.44
		fleecy clouds, Vis. good
	06.00		Twilight.
	06.38	BE 7311	Dived.
	08.00	BE 7312
	12.00	BE 7313	Day's run: Surfaced 85.9 nm, Submerged 30.2 nm =116.1 nm
		SW 2, Sea 1, 1/2 overcast, Vis. medium
	15.02	BE 7321	Surfaced.
	15.28	BE 7321	Dived.
		SW 3, Sea 2-3, wafts of mist, 1024 mb, Vis. medium
	16.00	BE 7322
	20.00	BE 7332
	23.31	BE 7332	Surfaced.
	24.00	BE 7332
		SW 2, Sea 2, overcast, 1024 mb, Vis. medium

	13.06.44	North of the Azores
	00.21	BE 7333	Difference between dead reckoning and actual position after a navigation fix 19 nm, 268°T.
			New position: BE 7523.
	04.00	BE 5787
		SW 2, Sea 2, 1/2 overcast, Vis. good, 1026 mb
	05.45		Twilight.
	06.15	BE 5798	Dived.
	08.00	BE 5798
		SW 2, Sea 1, scattered Cumulus clouds, Vis. good, 1027 mb
	12.00	BE 5799	Day's run: Surfaced 88.2 nm, Submerged 29.5 nm =117.7 nm
	15.34	BE 5877	Surfaced.
	15.56	BE 5877	Dived.
		NW 2, Sea 2, 1/2 overcast, 1030 mb, Vis. good
	18.13		Incoming Radio Message 06.07/13/160
			1) Zimmermann, Schmidt, Sammler on 14 June at 08.00 hours switch to Diana Circuit.
	20.00	BE 5878
	24.00	BE 5876

	14.06.44	Outer Bay of Biscay
	01.48	BE 5876	Surfaced.
		NW 1, Sea 1, 1/2 overcast, 1030 mb, Vis. medium
	04.00	BE 5895
		Wind calm, NW-Swell, 1/2 overcast, misty, 1030 mb
	04.30	BE 5896	Dived.
	08.00	BE 5974	Switched to Diana Circuit.
	12.00	BE 5975	Day's run: Surfaced 41.5 nm, Submerged 39.0 nm = 80.5nm
	16.00	BE 5976
	20.00	BE 5981
	23.54	BE 5982	Surfaced. Difference between dead reckoning and actual position after a navigation fix 15 nm, 68°T.
		Wind calm, long NW-Swell, hazy horizon, 1030.5 mb, Vis. changing
			New position: BE 5968.

	Sun and Moon Data 12.06.44
	Sun and Moon Data 13.06.44
	Sun and Moon Data 14.06.44

- 39 -




	15.06.44
	00.30		End of twilight.
	02.00	BE 6749	Dived.
		Wind calm, NW-Swell 2, hazy horizon, 1030.5 mb
	04.00	BE 6749
	08.00	BE 6757
	12.00	BE 6758	Day's run: Surfaced 30.3 nm, Submerged 38.9 nm =69.2 nm
	16.00	BE 6759
	20.00	BE 6767
	24.00	BE 6765

	16.06.44
	00.27	BE 6765	Surfaced.
		hazy horizon, 1032 mb, air temperature +19°C, water +16.5°C,	Marine phosphorescence
	02.47	BE 6854	Dived
	04.00	BE 6854
	08.00	BE 6855
	12.00	BE 6856	Day's run: Surfaced 32.5 nm, Submerged 31.9 nm = 64.4 nm
	16.00	BE 6864
	18.31		Incoming Radio Message 1051/1/865
			On 17 June at 08.00 hours switch: Hacklander Ireland Circuit, Zimmerman, Schmidt, Sammler, U-505 Coastal Circuit.
	20.00	BE 6865
	24.00	BE 6863

	17.06.44
	00.22	BE 6941
		NE 4, Sea 3-4, overcast, Vis. good, 1030.5 mb, air temperature +17.5°C, water +17.5°C	Strong marine phosphorescence.
	03.06	BE 6953	Dived.
	04.00	BE 6953
	08.00	BE 6961	Switched to Coastal Circuit.
	12.00	BE 6962	Day's run: Surfaced 37.1 nm, Submerged 37.2 nm = 74.3 nm
	16.00	BE 6963
	20.00	BF 4741
	24.00	BF 4718

	18.06.44
	00.51	BF 4718	Surfaced.
		NE 3, Sea 2, overcast, 1029 mb
	03.56	BF 4737	Dived.
	04.00	BF 4737
	08.00	BF 4738
	12.00	BF 4739	Day's run: Surfaced 31.4 nm, Submerged 36.5 nm = 67.9 nm
	16.00	BF 4817
	20.00	BF 4818
	24.00	BF 4816

	19.06.44	Bay of Biscay
	00.25	BF 4816	Surfaced.
	02.38	BF 4834	Dived.
		N 3, Sea 2, 1/2 overcast, Vis. good, 1023 mb
	04.00	BF 4835

	Sun and Moon Data 15.06.44
	Sun and Moon Data 16.06.44
	Sun and Moon Data 17.06.44
	Sun and Moon Data 18.06.44
	Sun and Moon Data 19.06.44

- 40 -



	continued
	19.06.44
	08.00	BF 4836
	12.00	BF 4914	Day's run: Surfaced 31.4 nm, Submerged 37.9 nm = 69.3 nm
	16.00	BF 4915
	20.00	BF 4916
	24.00	BF 4924

	20.06.44
	00.25	BF 4921	Surfaced.
		NE 5-6, Sea 4, overcast, rain showers, Vis. medium, 1019 mb
	03.34	BF 4931	Dived
	04.00	BF 4931
	08.00	BF 4932
	12.00	BF 5711	Day's run: Surfaced 24.6 nm, Submerged 36.8 nm = 61.4 nm
	13.45		Incoming Radio Message 2043/19/16:
			Zimmermann: return harbor is Lorient.
			F.d.U. West
	16.00	BF 5712
	20.00	BF 5713
	24.00	BF 5713

	21.06.44
	00.03	BF 5713	Surfaced.
		NE 4, Sea 3, overcast, hazy horizon, 1018 mb
	00.40	BF 5721	Caught by searchlight aircraft from 355°R, 75°T, at the same moment machine gun fire at the bridge. 4-engined aircraft in low altitude flight, range 1500 meters, altitude 25 meters. Went to AK and turned hard to starboard. two bombs distance 2-3 meters to starboard forward of the torpedo hatch, third bomb distance 3-4 meters at the level of the E-motors. 3 heavy concussions. By the water column and air pressure all gun crews were thrown to the deck. Short detection first heard at overflight. After clear report by Chief Engineer, Crash dive. At depth A -20 meters boat caught and balanced.
			Damage: Diving planes, port main switchboard, illumination, transmitter, starboard shaft knocks, fixed periscope adjustable mirror broken. 2 battery cells leaked. Suction system for both batteries torn. Three T 3 in tubes I, II and III out of service. All batteries [in the torpedoes] ruined. Motor chamber bulkheads dented. In tube III battery switch, main switch rudder lock and stop mechanism completely smashed. After removing the pistols, the torpedoes were ejected because the batteries were giving off gas. Torpedo shot angle receiver linkage warped.
			Behavior of the crew was calm and good. Due to surprise approach from ahead and a short distance the manned weapons were not able to shoot.
	04.00	BF 5722
	08.00	BF 5489

	Sun and Moon Data 19.06.44
	Sun and Moon Data 20.06.44
	Sun and Moon Data 21.06.44

- 41 -



	continued
	21.06.44
	12.00	BF 5497	Day's run: Surfaced 7.7 nm, Submerged 36.0 nm = 43.7 nm
	16.00	BF 5497
	20.00	BF 5498
	23.10	BF 5499	Surfaced to ventilate. Difference between dead reckoning and actual position after a navigation fix 30 nm, 4°T.
		NE 4, Sea 3, 1/2 overcast, 1015 mb
	23.20	BF 5463	Dived.
	24.00	BF 5463

	22.06.44
	02.03	BF 5541	Surfaced.
		E 4-5, Sea 4, 1/2 overcast, summer lightening, 1015 mb	Because I no longer trust my Fu.M.B., zigzagged 40° around the general course and started an Aphrodite every 10 minutes.
			Took a bearing on B.d.U. transmitter I of 62°T.
	02.15		Sent Short Signal: Position 48 hours off convoy intake and objective point.
	03.50	BF 5557	Short detection, at the same time aircraft abeam to port throws signal flares. Range 7000-8000 meters.
	03.51		Dived.
	04.00	BF 5557
	08.00	BF 5558
	12.00	BF 5556	Day's run: Surfaced 24.5 nm, Submerged 27 nm = 51.5 nm
	16.00	BF 5552
	20.00	BF 5552
	24.00	NF 5553

	23.06.44	Bay of Biscay
	00.59	BF 5553	Surfaced.
		NE 1-2, Sea 1, hazy horizon, 1017 mb	New Short Signal sent: Position 24 hours off convoy intake point.
			Was not heard.
	01.35	BF 5529	Short detection. Crash dived.
	04.00	BF 5537	Surfaced.
	04.10		Outgoing Radio Message: 0410/23/289
			Position 24 hours off convoy intake point.
			U-548
	04.37	BF 5537	Dived.
	08.00	BF 5534
	12.00	BF 5535	Day's run: Surfaced 10.2 nm, Submerged 20.7 nm = 30.9 nm
	16.00	BF 5535
	20.00	BF 5533
	24.00	BF 6177

	24.06.44
	00.18		Incoming Radio Message 1746/23/71: Zimmermann: Do not cross the 50-meter line without escort.
	00.13		Incoming Radio Message 2000/23/72: For Zimmermann Officer-Only Radio Message Serial No. 70 still not in effect. convoy intake remains at 03.00 hours.
	00.55	BF 6177	Surfaced. Directly ahead on the horizon heavy anti-aircraft fire and searchlights. Every 5 minutes started an Aphrodite.
		NE 2, Sea 1, hazy horizon, 1020 mb
	01.39	BF 6175	Point 352 shadow ahead. Closed to 2000 meters. 3 mine search boats on northerly course. Attempted to exchange recognition signals with signal lamp.

	Sun and Moon Data 21.06.44
	Sun and Moon Data 22.06.44
	Sun and Moon Data 23.06.44
	Sun and Moon Data 24.06.44

- 42 -



	continued
	24.06.44		No answer, I believe that they were an outbound convoy, that due to the increased aircraft danger does not want to report.
	02.30		Point Leben. Still no escort seen.
	02.30		Outgoing Radio Message 0229/24/75: Request bearing signals from escort.
			U-548
			In the direction of the started Aphrodite continual parachute flares. All around parachute flares.
	03.20	BF 6176	Taken in convoy by 3 mine search boats, the same ones that approached before.
	03.20		Incoming Radio Message 0302/24/77: Zimmermann bearing signals were sent, Bearing signal "Ulli".
			F.d.U. West
	04.00	BF 6173
		NE 1, Sea 0-1, 1020 mb
	05.10		Lorient barrier, released escort.
	05.30		Made fast U-boat bunker.


		O b s e r v a t i o n s !

		1) A fixed Naxos-Fu.M.B. antenna should be sought for the Fliege because:
		a) Fliege end cable is too susceptible to failure and brittle and the Fliege is very vulnerable when getting into the boat.
		b) The interception of brief detections is not guaranteed by rotation with the direction finder and this is a very great concern.
		2) The detected faults in the Fu.M.B. could not be corrected due to lack of spare parts.
		3) A dedicated Fu.M.B. would have increased the tactical readiness of the boat.
		4) Accurate knowledge and careful maintenance is required to keep the 3.7 cm cannon operational at the front as a fully automatic weapon.

		Total day's run:
		Surfaced 4837.6 nm
		Submerged 3167.0 nm
		Total 8004.6 nm
		=======

			On board the 24th July 1944

			Oberleutnant z.S. and Kommandant

	Enclosures to U-548's KTB - click on the text at left to proceed to the document

Chart	Track chart covering entire war patrol

Sketches	Combat Sketches

Radio	Excerpt of the Radio Log



	Comments of the Befehlshabers der Unterseeboote
	on the K.T.B. of "U-548" (Zimmermann) from 21.3. - 24.6.1944.

	First patrol of the Kommandant, operation in the area of the Newfoundland Bank and south therefrom.
	Despite the correct and energetic operation of the Kommandant no greater success then a destroyer sunk was granted the boat with the relatively heavy traffic encountered - this was mainly due to the continual fog in the operations area. Despite numerous sound bearings one could not get at the enemy due to the poor visibility.
	The Kommandant was particularly unlucky on 9 May during the meeting with the enemy convoy. As a result, the visibility of 50 meters and due to the lack of suitable torpedoes an attack was impossible.
	Behavior of the boat both in attack against naval targets as in the defense of aircraft is worthy of recognition

	Accredited success: 1 destroyer sunk.

		For the Befehlshaber der Unterseeboote
		- The Chief of the Operations Department -

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