German submarine U-777

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Career (Nazi Germany)
Name:U-777
Ordered:20 January 1941
Builder:Kriegsmarinewerft Wilhelmshaven
Yard number:160
Laid down:5 June 1943
Launched:25 March 1944
Commissioned:9 May 1944
Identification:M 17 108
Fate:Destroyed in air raid, 15 October 1944
General characteristics
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
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 × GL RP 137/c 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) at 10 kn (19 km/h) surfaced
80 nmi (150 km) at 4 kn (7.4 km/h) submerged
Test depth:230 m (750 ft)
Crush depth: 250–295 m (820–968 ft)
Complement:44–52 officers & ratings
Armament:
Service record
Part of:Kriegsmarine:
31st U-boat Flotilla
Commanders:Oblt.z.S. Günter Ruperti (9 May 1941–15 Oct 1942)
Operations:None
Victories:None
 
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Career (Nazi Germany)
Name:U-777
Ordered:20 January 1941
Builder:Kriegsmarinewerft Wilhelmshaven
Yard number:160
Laid down:5 June 1943
Launched:25 March 1944
Commissioned:9 May 1944
Identification:M 17 108
Fate:Destroyed in air raid, 15 October 1944
General characteristics
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
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 × GL RP 137/c 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) at 10 kn (19 km/h) surfaced
80 nmi (150 km) at 4 kn (7.4 km/h) submerged
Test depth:230 m (750 ft)
Crush depth: 250–295 m (820–968 ft)
Complement:44–52 officers & ratings
Armament:
Service record
Part of:Kriegsmarine:
31st U-boat Flotilla
Commanders:Oblt.z.S. Günter Ruperti (9 May 1941–15 Oct 1942)
Operations:None
Victories:None

German submarine U-777 was a German Type VIIC U-boat built in World War II, launched on 25 March 1944, and commissioned on 9 May, by its sole commander, Oberleutnant zur See Günter Ruperti. It underwent training with the 31st U-boat Flotilla, but did not participate in any patrols during its five-month career of active service. It was destroyed at 20:02 hours on the night of 15/16 October 1944, during a British air raid on Wilhelmshaven, Germany, at position 53°51′N 08°10′E / 53.850°N 8.167°E / 53.850; 8.167Coordinates: 53°51′N 08°10′E / 53.850°N 8.167°E / 53.850; 8.167. One crewman was killed.[1]

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Notes
  1. ^ U-Boat Operations of the Second World War, Volume 2: Career Histories, U511-UIT25
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