German submarine U-681

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History
War ensign of Germany (1938-1945).svg Nazi Germany
NameU-681
Ordered25 August 1941
Builder Howaldtswerke, Hamburg
Yard number830
Laid down21 October 1942
Launched20 November 1943
Commissioned3 February 1944
FateSunk by depth charges on 11 March 1945
General characteristics
Class and type Type VIIC submarine
Displacement
  • 769  t (757 long tons) surfaced
  • 871 t (857 long tons) submerged
Length
Beam
  • 6.20 m (20 ft 4 in) (o/a)
  • 4.70 m (15 ft 5 in) (pressure hull)
Height9.60 m (31 ft 6 in)
Draught4.74 m (15 ft 7 in)
Installed power
  • 2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels)
  • 750 PS (550 kW; 740 shp) (electric)
Propulsion
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)
Complement4 officers, 40–56 enlisted
Armament
Service record
Part of:
Identification codes: M 49 036
Commanders:
  • Oblt.z.S.d.R. Helmut Bach
  • 3 February – 2 August 1944
  • Oblt.z.S. Werner Gebauer
  • 2 August 1944 – 11 March 1945
Operations:
  • 1 patrol:
  • 14 February – 10 March 1945
Victories: None

German submarine U-681 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 12 October 1942 at the Howaldtswerke yard at Hamburg, launched on 20 November 1943, and commissioned on 3 February 1944 under the command of Oberleutnant zur See d.R. Helmut Bach.

Contents

Attached to 31st U-boat Flotilla based at Kiel, U-681 completed her training period on 31 October 1944 and was assigned to front-line service.

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-681 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. [1] She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two Siemens-Schuckert GU 343/38–8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft). [1]

The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph). [1] When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-681 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, (220 rounds), one 3.7 cm (1.5 in) Flak M42 and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty. [1]

Service history

On 10 March 1945, U-681 grounded off Scilly, damaging the pressure hull and propellers. Unable to dive, Werner Gebauer, the commander of the U-boat, headed for the Irish coast, hoping for internment by Irish authorities. However, the next morning PB4Y-1 Liberator N of VPB-103 spotted U-681 on the surface and went in for the attack. Eight depth charges further damaged the U-boat, and Gebauer ordered the crew to abandon ship. With sea cocks opened and demolition charges set, U-681 submerged followed by a massive explosion. Of the crew of 47, a British escort picked up 38 survivors. [2]

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49°53′N6°31′W / 49.883°N 6.517°W / 49.883; -6.517