German submarine U-621

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Career (Nazi Germany)
Name: U-621
Ordered: 15 August 1940
Builder: Blohm & Voss, Hamburg
Yard number: 597
Laid down: 1 July 1941
Launched: 19 March 1942
Commissioned: 7 May 1942
Fate: Sunk on 18 August 1944 near La Rochelle at position 45°52′N 02°36′W / 45.867°N 2.600°W / 45.867; -2.600 by depth charges from Canadian destroyers HMCS Ottawa, HMCS Kootenay and HMCS Chaudiere.
General characteristics [1]
Class and type: Type VIIC submarine
Displacement: 769 tonnes (757 long tons) surfaced
871 t (857 long tons) submerged
Length: 67.1 m (220 ft 2 in) o/a
50.5 m (165 ft 8 in) pressure hull
Beam: 6.2 m (20 ft 4 in) o/a
4.7 m (15 ft 5 in) pressure hull
Height: 9.6 m (31 ft 6 in)
Draft: 4.74 m (15 ft 7 in)
Propulsion: 2 × supercharged Germaniawerft 6-cylinder 4-stroke F46 diesel engines, totalling 2,800–3,200 bhp (2,100–2,400 kW). Max rpm: 470-490
2 × electric motors, totalling 750 shp (560 kW) and max rpm: 296
Speed: 17.7 knots (32.8 km/h; 20.4 mph) surfaced
7.6 knots (14.1 km/h; 8.7 mph) submerged
Range: 8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced
80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth: 230 m (750 ft)
Crush depth: 250–295 m (820–968 ft)
Complement: 44–52 officers & ratings
Armament:
Service record[2]
Part of: 8th U-boat Flotilla
(7 May - 30 September 1942) - Training
9th U-boat Flotilla
(1 October 1942 - 18 August 1944)
Commanders:
  • Kptlt. Horst Schünemann (7 May 1942 - 4 December 1942)
  • Oblt.z.S. Max Kruschka (4 December 1942 - 7 May 1944)
  • Oblt.z.S. Hermann Stuckmann (15 May 1944 - 18 August 1944)
Operations: 1st patrol:
29 September - 5 November 1942
2nd patrol:
5 December 1942 - 5 January 1943
3rd patrol:
1 February - 23 March 1943
4th patrol:
22 April - 3 June 1943
5th patrol:
22 August - 28 September 1943
6th patrol:
6–23 January 1944
7th patrol:
21 February - 19 April 1944
8th patrol:
6–23 June 1944
9th patrol:
15 July - 11 August 1944
10th patrol:
13–18 August 1944
Victories: 4 merchant ships sunk (20,159 GRT)
1 merchant ship damaged (10,048 GRT)
1 warship sunk (2,938 tons)
1 warship damaged (1,625 tons)

German submarine U-621 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 1 July 1941 by Blohm & Voss in Hamburg as yard number 597, launched on 19 March 1942 and commissioned on 7 May 1942 under Kapitänleutnant Horst Schünemann.

Service History[edit]

The boat's service began on 7 May 1942 for training as part of the 8th U-boat Flotilla. After training was completed she transferred to the 9th flotilla on 1 October 1942 for active service.

In ten patrols she sank four merchant ships for a total of 20,159 gross register tons (GRT), plus one auxiliary warship. She also damaged two more ships.

Wolfpacks[edit]

She took part in eleven wolfpacks, namely,

  • Panther (10–16 October 1942)
  • Puma (16–29 October 1942)
  • Raufbold (11–18 December 1942)
  • Hartherz (3–7 February 1943)
  • Ritter (11–26 February 1943)
  • Burggraf (4–5 March 1942)
  • Raubgraf (7–15 March 1943)
  • Amsel 1 (3–6 May 1943)
  • Elbe (7–10 May 1943)
  • Elbe 2 (10–14 May 1943)
  • Mosel (19–24 May 1943)

Fate[edit]

She was sunk by a depth charges dropped by three Royal Canadian Navy destroyers, HMCS Ottawa, HMCS Kootenay and HMCS Chaudiere on 18 August 1944 near La Rochelle at position 45°52′N 02°36′W / 45.867°N 2.600°W / 45.867; -2.600Coordinates: 45°52′N 02°36′W / 45.867°N 2.600°W / 45.867; -2.600.

Summary of raiding career[edit]

Date Name Nationality Tonnage
(GRT)
Fate[3]|- 23 October 1942 Empire Turnstone  United Kingdom 6,113 Sunk
18 December 1942 Oropos  Greece 4,474 Sunk
20 December 1942 Otina  United Kingdom 6,217 Sunk
11 March 1943 Baron Kinnaird  United Kingdom 3,355 Sunk
15 June 1944 USS LST-133  United States Navy 1,625 Damaged
29 July 1944 HMS Prince Leopold  Royal Navy 2,938 Sunk
30 July 1944 Ascanius  United Kingdom 10,048 Damaged

References[edit]

  1. ^ Gröner 1985, pp. 72-74.
  2. ^ Helgason, Guðmundur. "The Type VIIC boat U-621". German U-boats of WWII - uboat.net. Retrieved 3 May 2014. 
  3. ^ Helgason, Guðmundur. "Ships hit by U-621". German U-boats of WWII - uboat.net. Retrieved 3 May 2014. 

Bibliography[edit]

  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945. Der U-Boot-Krieg (in German) IV (Hamburg, Berlin, Bonn: Mittler). ISBN 3-8132-0514-2. 
  • Gröner, Erich (1985). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. Die deutschen Kriegsschiffe 1815-1945 (in German) III (Koblenz: Bernard & Graefe). ISBN 3-7637-4802-4. 
  • Edwards, Bernard (1996). Dönitz and the Wolf Packs – The U-Boats at War. London, UK: Cassell Military Classics. p. 161. ISBN 0-304-35203-9. 

External links[edit]