U-594 - 5th War Patrol

Translation by Jerry Mason with help from Andi Forster

Departed	Date	Arrived	Date	Days at Sea
St. Nazaire	23 March 1943	St. Nazaire	14 April 1943	23

 

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Ships Hit

None

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.

---

				Copy No. . . . . . . . . .
			K  r  i  e  g  s  t  a  g  e  b  u  c  h
				of the
			U  n  t  e  r  s  e  e  b  o  o  t  e  s    "U 594".
			Kommandant:    Kapitänleutnant    M  u  m  m  .
			Beginning on :    19 February 1943.
			Concluding on :    14 April 1943.
			Distribution:     Oberkommando der Kriegsmarine Copy No. 1+2 Befehlshaber der Unterseeboote     "      " 3 Kom. Admiral der Unterseeboote     "      " 4 Führer der Unterseeboote West     "      " 5 Führer der Unterseeboote -Ausbildungsabtlg.-     "      " 6 27. Unterseebootsflottille     "      " 7 7. Unterseebootsflottille     "      " 8
			Enclosures:     Track chart Copy No. 2-5 1 Combat sketch     "      " 2-5 Excerpt of the General Radio Log     "      " 2-5+8 Officer-Only Radio Log     "      " 8
				© U-boat Archive 2023 - all rights reserved

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

	- 1 -
		19.02. - 19.03.43	St. Nazaire	Shipyard period.
		17.03.43		Sea trial.
		20. - 23.03.43		Outfitting.
		23.03.43
		15.00		Departed St. Nazaire.
				Fu.M.G. testing.
		16.30		Taken under escort.
		20.30		Released escort.
		20.53 - 21.16		Final trim test.
				Surface transit together with "U-267" and "U-455".
		24.00	SE 5, Sea 4, 7/10, 997 mb, +12°C, Vis. good, dark, no marine phosphorescence
		24.03.43
		02.00		"U-267" and "U-455" out of sight.  Strong visibility deterioration.
		04.00	ESE 5, Sea 4, 7/10, 995 mb, Vis. low, drizzle, mist
		07.17		Dived to proceed submerged.
		08.00	BF 5895
		12.00	BF 5886	Day's run:  Surfaced 125, Submerged 14 nm
		13.02		Surfaced to proceed on the surface.  Favorable weather conditions.
		16.00	BF 5871
			ESE 2, Sea 2, 2/10, +12°C, Vis. over 10 nm
		19.57	BF 5749	Horizontally polarized detection on 1.69 meters.  No steady tome, faint search tone.  Did not dive.
		21.21	BF 5744	Horizontally polarized detection on 1.72 meters.  Steady tone.  Crash dive.
		21.56		Surfaced.
		23.13		Radio Message:  1127/24/88:
				From F.d.U. West.
				Boats for which there is no major detour, proceed via square BF 4883.  See "Janssen" report. (Sighting life buoy light)
				Operated accordingly.
		23.20	BF 4961	Horizontally polarized detection on 1.72 meters.
				Faint and interrupted search tone.  Only growing louder after 1/4 hour steady tone.
		23.35		Crash dive.

	Sun and Moon Data 23.03.43
	Sun and Moon Data 24.03.43

	- 2 -
		continued
		24.03.43
		24.00	BF 4961
			SW 2, Sea 2, 6/10, 996 mb, +11°C, Vis. good, light marine phosphorescence
		25.03.43
		00.04		Surfaced.
		00.08	BF 4961	Horizontally polarized detection on 1.69 meters.  Faint search tone.  After 10 minutes swelling steady tone.
		00.15		Crash dive.
				Due to steady tone detection longer submerged.
		01.15		Several close depth charge detonations.
		02.02		Surfaced.
		02.07	BF 4953	Horizontally polarized detection on 1.69 meters.
				Crash dive.
		03.03		Surfaced.
		04.00	BF 4952	Horizontally polarized detection on 1.69 meters.  Swelling steady tone.  Crash dive.
		05.00		Surfaced.
		06.14	BF 4918	Horizontally polarized detection on 1.69 meters.  Steady tone.  Crash dive.  Proceeded submerged.
		08.00	BF 4918
			NNE 3, Sea 2, 1001 mb, overcast, Vis. 8 nm
		12.00	BF 4917	Day's run:  Surfaced 140, Submerged 23 nm
		14.02		8 distant depth charge detonations.
		16.00	BF 4941
		16.45		5 distant detonations.
		16.48		7      "             "
		20.04	BF 4863	Surfaced to proceed on the surface.
		20.13		Radio Message orders 1907/25/24:
				New objective square AK 69.
		21.20	BF 4867	2 light bodies, similar to star shells, at great height over the boat.
				Crash dive.
				No detection, no sound bearings.
		22.25		Surfaced.
		24.00	BF 4885
			NNW 3, Sea 2, 5/10, 1009 mb, +12°C, Vis. good, light marine phosphorescence
		26.03.43
		04.00	BF 4768
		07.26		Dived to proceed submerged.

	Sun and Moon Data 24.03.43
	Sun and Moon Data 25.03.43
	Sun and Moon Data 26.03.43

	- 3 -
		continued
		26.03.43
		08.00	BF 4742
			N 3, Sea 2, 9/10, 1013 mb, +12°C, Vis. good
		12.00	BE 6939	Day's run:  Surfaced 121, Submerged 27 nm
		16.00	BE 6935
		20.00	BE 6923
		20.28		Surfaced to proceed on the surface.
		24.00	BE 6536
			NW 3, Sea 2, 1020 mb, overcast, Vis. medium, light marine phosphorescence
		27.03.43
		00.15		Outgoing Short Signal:
				Passing report BE 65.
		01.15		Confirmation of passing report (0035/27/53).
		04.00	BE 6281
		06.58		One parachute flare abeam to starboard.  Crash dive.  No detection.
		08.00	BE 6244
		08.24		Surfaced.
		12.00	BE 6125	Day's run:  Surfaced 165, Submerged 29 nm
			WNW 3, Sea 2, 4/10, 1026 mb, +12°C. Vis. 10 nm
		12.35		Switched to "Ireland" Circuit.
		16.00	BE 3775
		20.00	BE 2967
		24.00	BE 2951
			W 1, Sea 1, 1028 mb, +12°C, overcast, Vis. good, light marine phosphorescence
		28.03.43
		04.00	BE 2911
		0743 - 08.43		Test dive.
				After second expressing of the port negative buoyancy tank at depth A -40 meters 2 detonations, similar to aircraft bombs.  After surfacing found an oil trace.  Result of preliminary investigation and assumed cause see Radio Message page 4.  Later exact findings in calm weather conditions showed bulging of main ballast and reserve fuel oil tank 4 port and tearing off the wall from tension due to excess pressure from the cracked negative buoyancy tank.  For this reason, explosive devices are assumed. (See Radio Message page 12).

	Sun and Moon Data 26.03.43
	Sun and Moon Data 27.03.43
	Sun and Moon Data 28.03.43

	- 4 -
		continued
		28.03.43
		12.00	BE 2555	Day's run:  Surfaced 147, Submerged 3 nm
			SW 5, Sea 4, 1014 mb, +12°C, overcast, Vis. 3 nm
		16.00	BE 2515
		20.00	BE 2196
		24.00	BE 2191
			W 5, Sea 4, 1023 mb, +12°C, overcast, Vis. medium, light marine phosphorescence
		29.03.43
		02.00		German Summer Time.
		04.00	BE 2151
		08.00	BE 2115
		08.59 - 10.14		Test dive.
		12.00	AL 8899	Day's run:  Surfaced 119, Submerged 3 nm
			W 7, Sea 6, 1017 mb, +12°C, overcast, Vis. 5 nm
		16.00	AL 8891
		20.00	AL 8854
		21.30		Outgoing Radio Message 2015/29/109:
				28 March during test dive 2 detonations at depth A -40 meters similar to aircraft bombs.
				1.)  Crack between negative buoyancy tank and main ballast and reserve fuel oil tank.
				2.)  2 times 4 cm leak forward edge of 4 port waterline, pushed in, oil loss 7 cbm.  Suspect explosive device.  Deep dive test 25 March to depth A +40 meters.
				Square AL 8854.  Weather Serial Nos. 164, 174, 183, 196 not solved.
		24.00	AL 8818
			W 7, Sea 6, 1019 mb, +13°C, overcast, Vis. medium, no marine phosphorescence
		30.03.43
		04.00	AL 8735
		05.21		Due to weather conditions dived to proceed submerged.
		08.00	AL 8723
		11.45		Surfaced.
		12.00	AL 8722	Day's run:  Surfaced 88, Submerged 10 nm
			SW 7, Sea 6, 1014 mb, +12°C, overcast, Vis. 5 nm

	Sun and Moon Data 28.03.43
	Sun and Moon Data 29.03.43
	Sun and Moon Data 30.03.43

	- 5 -
		continued
		30.03.43
		16.00	AL 8479
		20.00	AL 7595
		24.00	AL 7582
			W 3, Sea 3, 1017 mb, +10°C, overcast, Vis. medium, no marine phosphorescence
		31.03.43
		04.00	AL 7572
		08.00	AL 7467	Switched to "Hubertus" Circuit (in accordance with Radio Message 2232/30/137).
		11.17 - 13.50		Test dive.  Moved torpedoes.
		12.00	AL 7455	Day's run:  Surfaced 105, Submerged 13 nm
			SW 6, Sea 5, 1020 mb, +12°C, overcast, Vis. 5 nm
		16.00	AL 7445
		20.00	AL 7419
		24.00	AK 9635
			SW 5, Sea 4, 1/10, 1023 mb, +11°C, Vis. good, dark, light marine phosphorescence, Northern Lights
		01.04.43
		04.00	AK 9625
		08.00	AK 9612
		08.45 - 09.55		Test dive.
		12.00	AK 9532	Day's run:  Surfaced 93, Submerged 5 nm
			SSW 5, Sea 4, 1022 mb, +11°C, overcast, Vis. 6 nm
		14.28		Radio Message Orders 1301/1/894:
				1.)  As new group "Löwenherz" Bauer, Fiehn, Pich, Winkler, Eckelmann, Zitzewitz, Purkhold, Fiedler, Borm, Kummetat, Lange, U-563, Mumm, Deecke and Karpf on 3 April at 00.00 hours be in reconnaissance line from AK 2516 to 5919, course 260°, day's run 100 nm.  Eastbound convoy is expected.
		16.00	AK 9288
		20.00	AK 9243
		24.00	AK 9133
			SSE 4, Sea 4, +11°C, 1020 mb, overcast, Vis. medium, no marine phosphorescence

	Sun and Moon Data 30.03.43
	Sun and Moon Data 31.03.43
	Sun and Moon Data 01.04.43

	- 6 -
		02.04.43
		04.00	AK 6786
		08.00	AK 6746
		12.00	AK 5939	Day's run:  Surfaced 137, Submerged 3 nm
			SSE 4, Sea 4, 9/10, 1015 mb, +10°C, Vis. 6 nm, medium-high Swell
		16.00	AK 5697
		15.40 - 16.20		Test dive and torpedo movement.
		20.00	AK 5949
		21.20		Reached reconnaissance line.
		24.00	AK 5562
			S 4, Sea 3, +8°C, 1008 mb, overcast, Vis. good, light marine phosphorescence
		03.04.43
		04.00	AK 5556
		08.00	AK 5573
			SW 5, Sea 4, 2/10, 1011 mb, +7°C, Vis. medium, rain showers
		12.00	AK 5571	Day's run:  Surfaced 119, Submerged 3 nm
			WSW 6, Sea 4, 8/10, 1014 mb, +4°C, Vis. medium, showers
		16.00	AK 5491
		20.00	AK 5448
		24.00	AK 5476
			SW 5, Sea 4, +6°C, 1018 mb, overcast, Vis. medium, no marine phosphorescence
		04.04.43
		04.00	AK 4689
		08.00	AK 4689
		09.51 - 10.20		Test dive.
		12.00	AK 4921	Day's run:  Surfaced 122, Submerged 2 nm
			NW 2, Sea 1, +6°C, 1015 mb, overcast, Vis. over 10 nm
		12.24		Short Signal from Lange:
				Convoy in sight square AK 4645, course 60°.
				Operated on the report at highest speed.

	Sun and Moon Data 02.04.43
	Sun and Moon Data 03.04.43
	Sun and Moon Data 04.04.43

	- 7 -
		continued
		04.04.43
		13.25		Radio Message Orders 1309/4/846:
				1.)  "Löwenherz" go on Lange-report.
				2.)  Attack free, as soon as other boats have contact.
				Further enemy reports.
		13.33		Lange:  AK 4616, course 30°, 10 knots.
		14.50		Lange: AK 4387, course 30°, 10 knots.
		16.43		Kummetat: 16.22 hours AK 4613.
		18.13		Kummetat:  17.49 hours AK 4346, course 20°, 9 knots.
		18.54		Lange:  15.00 hours AK 4388.
		16.00	AK 4623
			WNW 4, Sea 2, 4/10, 1015 mb, +10°C, Vis. 10 nm
		16.38		Radio Message 1502/4/854:
				To Group "Löwenherz".
				Absolutely try to attack tonight at the beginning of darkness.  Evaluation of the last large convoy battles has shown that, due to surprise and inattentiveness, the first night is always the most favorable.
		19.25	AK 4327	Destroyer bearing 30°T, small target angle, course south.  Suspect aft escort.
				Destroyer zigzagged 30-40° around target angle 0° and despite AK slowly grew larger.  I am obviously detected.  Locating was not determined.  Favorable visibility conditions.
		20.00	AK 4354
			SW 5, Sea 4, 8/10, 1014 mb, +5°C, Vis. 10 nm
		20.52	AK 4357	Crash dive to depth A +70 meters. Listening pursuit.  Explosive sounding.  No Asdic.
		20.55		6 medium depth charges.
				Continued searching.
		21.25		Destroyer increases speed and was quickly very loud.
		21.28		Boat was overrun, loud explosive sounding, immediately afterwards about 8 to 10 well-placed depth charges over the boat (depth A +90 meters).  Boat was caught at depth A +110 meters by blowing main ballast tank 3.  The usual electronic failures.  Hull valve in the control room leaks heavily, however in-rushing water can be controlled.
				Further listening pursuit.  No depth charges.
		22.45		Last sound bearing in 75°T, medium Volume, then nothing more determined.
		24.00	AK 4381
			NW 4, Sea 3, 5/10, 1019 mb, Vis. good, light marine phosphoresence, Northern Lights

Sun and Moon Data 04.04.43

	- 8 -
		05.04.43
		00.25		Surfaced.  Pursued in 35°T.
		02.50		Outgoing Radio Message 0025/5/879:
				19.30 hours square AK 4327 detected by destroyer, forced off to the south, depth charge pursuit.  Position 4381.
				Further enemy reports:
		03.07		Schetelig: 02.30 hours AK 0157, NE-course.
		03.20		Purkhold: AK 0114.
		04.51		U-563:  03.29 hours AK 1733.
		05.49		Purkhold:  04.50 hours by sound bearings AK 0112.
		07.05		Zitzewitz:  05.31 hours, AK 1879, 30°.
		10.22		Purkhold:  09.08 hours AK 1859, 10°, 8 knots.
		10.22		Eckelmann:  09.00 hours AK 1852, 0°, 9 knots.
		10.43		Zitzewitz: 08.20 hours AK 1859, 30°.
		04.00	AK 4332
			NW 4, Sea 3, 5/10, 1019 mb, Vis. good
		08.00	AK 0124
		09.15 - 09.59		Test dive.
		11.25		Radio Message 5/893:
				"Löwenherz".
				According to exact navigation fixes from Zitzewitz and Purkhold position of the convoy at 05.30 hours is in AK 1879.
		12.00	AK 1864	Day's run:  Surfaced 254, Submerged 10 nm
			WNW 3, Sea 2, +5°C, 1023 mb, overcast, Vis. over 10 nm, medium-high Swell
		12.48	AK 1862	Several smoke clouds bearing 10°T.
		12.50		Destroyer bearing 40°T, starboard forward escort.
		13.00		Destroyer out of sight.
		13.44		Outgoing Short Signal:
				Convoy AK 1698.
		14.30		Radio Message 1055/5/801:
				To "Löwenherz".
				1.)  Today do not transmit unnecessarily by day.  Only success reports and contact keeper reports in accordance with Standing Order No. 2 are important.  Purkhold about 18.00 hours give assessment of the situation concerning air and sea defenses.
				2.)  Boats, that are at the convoy, maneuver ahead as quickly as possible for submerged attack, contact holders report before their attacks.  Other boats then join in as contact keeper.
		16.00	AK 2746
			NNE 2, Sea 1, 8/10, 1025 mb, +6°C, Vis. over 10 nm

Sun and Moon Data 05.04.43

	- 9 -
		continued
		05.04.43		Since Radio Messages with time groups are no longer decoded after 12.00 hours and the error is not clear here,
		17.30		Outgoing Radio Message with old time group 1150/5/820:
				1.)  Since 12.00 today no Radio Messages decoded.  Question changed keyword.
				2.)  13.44 hours sent Short Signal 1698.
				3.)  Enemy position 17.00 hours:  2272 [typo 2722], 80°, 9 knots.  New navigation fix.  Dived before aircraft.  Square AK.
				Control later reported own encoding error.
		16.15		Torpedo detonation in convoy.  High explosion column.
		16.29		6 depth charge detonations.
		16.51	AK 2754	Crash dive for "Boeing" in approach, bearing 60°T, 10000 meters away.
		17.18		Surfaced.
		17.30	AK 2755	Horizontally polarized detection on 1.72 meters.
		17.33		Swelling, louder steady tone.  Dived.
		17.58		Surfaced.
		18.00	AK 2756	Crash dive for "Boeing", bearing 120°T, 8000 meters away.  Flew by, low altitude.
		18.06		4 far off aircraft bombs at depth A -40 meters.  Believe I remained unnoticed.
		18.41		Surfaced.
				Although contact was not broken by the multiple dives, the intended day attack is no longer possible due to time lost.
		20.00	AK 2762
			SW 3, Sea 2, +7°C, 1022 mb, overcast, Vis. over 10 nm
		21.05		Outgoing Radio Message 2105/5/830:
				Convoy position 2811, main course east.
		22.45		Outgoing Short Signal:
				Enemy position AK 2821.
				Closed the convoy to attack at the beginning of dawn, convoy about target angle 50-60°.
				At the break of dawn visibility is momentarily up to 200 meters.
		23.05		U-boat on opposite course between the convoy and me.
		23.41		Short Signal from Krüger:
				Intend attack with FAT.

Sun and Moon Data 05.04.43

	- 10 -
		06.04.43
		00.00	AK 2823
			SW 4, Sea 3, +7°C, 1022 mb, overcast, Vis. very low, misty, drizzle
		00.12	AK 2823	Boat is in the center of the convoy, without shadows being distinguished before.  About 6-8 steamer and 1 destroyer in tight formation, the nearest 200 meters away, probably a forward partial convoy.  Unfavorable a shooting position due to too low distance and ramming danger, to use multiple tubes.  Therefore ran ahead on parallel course to get clear on one side and fire all tubes on the tight steamer group.
		00.37		3 detonations.
		01.03		In the mean time, visibility improved to about 1000 meters.  While turning to run in 3 star shells astern to starboard, however far off, shot from the direction of the convoy.  They don't seem to concern me.
		01.07	AK 2697	Against the illuminated sector noticed by a destroyer coming from ahead to port shooting with artillery and star shells, range below 1000 meters.
		01.08		Several detonations.
				Outgoing Short Signal:
				Enemy position AK 2697, course 90°.
		01.11		Destroyer comes up quickly.  Crash dive.  Was overrun by the convoy.  Afterwards listening pursuit.  Depth A +80 meters.
		01.44  )
		02.01  )		3 badly placed depth charge series.
		02.12  )
				Failure of the main drain pump due to the packing becoming leaky at the discharge nozzle.
		02.40		Last sound bearing in 100°T.
		03.15		Surfaced.  Pursued in 84°T.
				Repairs to the main drain pump - duration about 6 hours.
		04.00	AK 2697
			S 5, Sea 3, 7/10, 1017 mb, +9°C, dark, Vis. low
		05.23		Radio Message 0440/6/858:
				To "Löwenherz".
				If no contact, continue searching at highest speed to the east, convoy speed 8-10 knots.  Convoy probably goes to the North Channel.

Sun and Moon Data 06.04.43

	- 11 -
		continued
		06.04.43
		06.35		Outgoing Radio Message 0335/6/857:
				01.15 hours during attack star shells and artillery fire.  Listening pursuit.  No contact.
		06.13  )
		07.12  )		Star shells in 80°T.
		08.00	AK 3521	Switched to Diana Circuit in accordance with Radio Message 2330/5/841.
			S 5, Sea 4, 8/10, 1017 mb, +9°C, Vis. medium
		10.35	AK 3731	Aircraft attack:
			SW 5, Sea 3, 5/10, 1017 mb, +9°C, Vis. 10 nm, high clouds	"Boeing" in approach from astern to starboard, bearing 210°T, range 500 to 1000 meters, altitude about 100 meters.  Lack of attention by the lookout posts in the prevailing favorable weather conditions.
				Correct measure by the Watch Officer: hard to starboard.  Boat had turned 20-30° up to bomb throw.
				4 medium aircraft bombs to port, 20 to 40 meters away, no impact ignition.  Severe concussion.
				After the approach crash dive.
				Boat slowly reached depth after resetting the automatic battery switch, no further attack followed.  A developing stern down angle due to water intake in torpedo compensating tank 1 and from water overflow from fuel oil tank 1i can be corrected by speed increase and pumping at depths up to A meters.  Malfunctions in the electrical system were corrected one after another.  Further damage see Radio Message page 12.
		12.00	AK 3721 [typo	Day's run:  Surfaced 235, Submerged 15 nm
		12.10 - 12.15		Was overrun by a destroyer at high speed from 275°T to 90°T.
		12.30 - 13.15		Increasing and decreasing destroyer sounds bearing 200°T to 235°T.
		13.34		Surfaced.  Set off to the SW to determine and correct damage.
		16.00	AK 3761
			SW 7, Sea 5, +9°C, 1021 mb, overcast, Vis. 6 nm
		16.23		Outgoing Radio Message 1334/6/787:
				10.35 hours AK 3731 attacked by "Boeing".  Damage still not assessed.  Moving off.
		20.00	AK 3933
			WSW 7, Sea 5, +9°C, 1025 mb, overcast, Vis. 6 nm
		24.00	AK 0347
			SW 5, Sea 4, +9°C, 1026 mb, overcast, Vis. medium, light marine phosphorescence

Sun and Moon Data 06.04.43

	- 12 -
		07.03.43
		04.00	AK 6231
		08.00	AK 6264
		12.00	AK 6289	Day's run:  Surfaced 157, Submerged 3 nm
			SSW 3, Sea 2, 6/10, 1034 mb, +9°C, Vis. 10 nm
		15.10 - 16.10		Test dive.
				Began return transit.
		16.00	AK 6537
		18.23		Outgoing Radio Message 1625/7/728:
				1.)  Major damage:
				Pressure hull crack torpedo compensating tank 1 and 1i, compressor foundation, diesel air foot valve, 2 bottle groups, banging port shaft, ETO-batteries.  Limitedly clear to dive to depth A meters.
				2.)  To Serial No. 109 from 29 March:  evidence supports explosive device.
				3.)  Square AK 6294, 75 cbm, return transit, high pressure weather.
		18.39		Radio Message Order 1750/7/729:
				Mumm report operational readiness.
				Overcome by sending previous Radio Message.
		20.00	AK 6529
		20.45		Radio Message 2018/7/732:
				Radio Message 1625/7/728 on "Diana" not decoded.  Check.  Serial No. 728 settled.
		21.34		Outgoing Radio Message 2110/7/733:
				Key Serial No. 728 X R C A.
		24.00	AK 6582
			S 3, Sea 2, +10°C, 1032 mb, overcast, Vis. medium, no marine phosphorescence
		08.04.43
		04.00	AK 6828
		08.00	AK 6881
		12.00	AK 9226	Day's run:  Surfaced 132, Submerged 3 nm
			S 1, Sea 1, +10°C, 1031 mb, Vis. 8 nm, misty
		16.00	AK 9266
		20.00	AK 9626
		24.00	AK 7472

	Sun and Moon Data 07.04.43
	Sun and Moon Data 08.04.43

	- 13 -
		09.04.43
		02.11		Outgoing Short Signal weather report in accordance with Radio Message 1825/8/756:
				51.5°N, 25.5°W.  Air pressure during the last 3 hours falling 1028 mb, nearly to completely overcast, light wind beautiful weather, Vis. good, SE 2, wind had freshened, no Swell, +12°C, water +11°C.
		04.00	AL 7737
		08.00	AL 7884
		12.00	BR 1138	Day's run:  Surfaced 246, Submerged 0 nm
			SE 5, Sea 3, 9/10, 1022 mb, +12°C, Vis. over 10 nm
		16.00	BE 1522
		20.00	BE 1647
		24.00	BE 1925
			SSE 3, Sea 3, +14°C, 1019 mb, overcast, Vis. medium
		10.04.43
		04.00	BE 5171
		08.00	BE 5129	Switched to Coastal Circuit in accordance with Radio Message 1841/9/764.
		12.00	BE 5274	Day's run:  Surfaced 276, Submerged 0 nm
			S 1, Sea 1, 1/10, 1023 mb, +15°C, Vis. over 10 nm
		11.03		Radio Message 0942/10.21:
				Return harbor:  St. Nazaire.
		13.00 - 13.58		Test dive.
		16.00	BE 5524
		20.00	BE 5563
		24.00	BE 5656
			S 2, Sea 1, 1028 mb, +15°C, Vis. medium
		11.04.43
		04.00	BE 6457
		08.00	BE 6572	Dived to proceed submerged.
		12.00	BE 6581	Day's run:  Surfaced 202, Submerged 3 nm
		14.00		Surfaced due to favorable weather conditions.
		15.09		Starboard diesel out of service.  Replaced intake valve.  Dived to proceed submerged.
		16.00	BE 6594
		20.00	BE 6595
		21.58		Surfaced to proceed on the surface.
		24.00	BE 6687
			SSW 1, Sea 1, 9/10, 1032 mb, +15°C, Vis. good

	Sun and Moon Data 09.04.43
	Sun and Moon Data 10.04.43
	Sun and Moon Data 11.04.43

	- 14 -
		12.04.43
		04.00	BF 4712
		07.11	BF 4735	Horizontally polarized detection on 1.72 meters.
				Crash dive, proceeded submerged.
		08.00	BF 4736
		12.00	BF 4815	Day's run:  Surfaced 130, Submerged 43 nm
		16.00	BF 4819
		20.00	BF 4828
		24.00	BF 4941
			SSE 2, Sea 1, +14°C, 1018 mb, rain, Vis. good
		13.04.43
		04.00	BF 4966
		07.07		Outgoing Short Signal:
				Position 48 hours off meeting point with escort.
		08.00	BF 5759	Dived to proceed submerged.
		12.00	BF 5767	Day's run:  Surfaced 124, Submerged 43 nm
		14.36		Surfaced to proceed on the surface due to favorable weather conditions.
		16.00	BF 5873
			NW 1, Sea 0, +16°C, 1022 mb, clear sky
		18.58		Outgoing Radio Message 5809/13/43:
				Will reach escort meeting point 14 April, will join Wolf.
		20.00	BF 9112
		14.04.43
		03.38		U-boat in sight bearing 91°T.  After about 10 minutes U-boat dived.
		07.00		Taken under escort.
		12.00		Ran into St. Nazaire.
			Supplement:
			To Standing Order No. 18 it is reported:
			During listening and depth charge pursuit on 4 April repeated explosive locating by one destroyer observed.
			To 1.)  Occurred initially during the searching of the destroyer at irregular intervals, perceptible with the naked ear, there was also a noise in the listening gear in connection with the hard metallic blow, additionally a sound.  Directly before a very well-placed depth charge series an especially loud bang was heard at all places in the boat.
			To 2.)  Time difference between sounding and depth charge detonation 1-2 seconds.
			To 3.)  The destroyer overran the boat.
			To 4.)  Other locating sounds were not determined.
			To 5.)  Depth A +90 meters, depth charged placed above the boat.
			On board 14 April 1943               Kaptlt and Kmdt.

	Sun and Moon Data 12.04.43
	Sun and Moon Data 13.04.43
	Sun and Moon Data 14.04.43

 

	Enclosures to U-594's KTB - click on the text at left to proceed to the document
Sketch	Chart of convoy operation 4 - 6 April
Radio	Excerpt of the Radio Log

 

	Comments of the Berehlshabers der Unterseeboote
	on the K.T.B. of "U-594" from 23.3.43 - 14.4.43 (Mumm).
	Broke off patrol due to depth charge damage.
	Nothing to note.
		For the Befehlshaber der Unterseeboote
		The Chief of the Operations Department.

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