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German submarine U-777

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Title: German submarine U-777  
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German submarine U-777

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 [1]
Class & type: Type VIIC submarine
  • 769 tonnes (757 long tons) surfaced
  • 871 t (857 long tons) submerged
  • 6.20 m (20 ft 4 in) o/a
  • 4.70 m (15 ft 5 in) pressure hull
Height: 9.60 m (31 ft 6 in)
Draft: 4.74 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)
  • 17.7 knots (32.8 km/h; 20.4 mph) surfaced
  • 7.6 knots (14.1 km/h; 8.7 mph) submerged
  • 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: 4 officers, 40–56 enlisted
Service record
Part of:
Commanders: Oblt.z.S. Günter Ruperti (9 May 1944 – 15 October 1944)
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.


  • Design 1
  • Other notes 2
  • References 3
  • Bibliography 4
  • External links 5


German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-777 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.[1] It 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 Garbe, Lahmeyer & Co. RP 137/c double-acting electric motors producing a total of 750 shaft horsepower (760 PS; 560 kW) for use while submerged. It had two shafts and two 1.23 m (4 ft) propellers. It 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, it could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, it could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-777 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at its bow and one at its stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and an anti-aircraft gun. It had a complement of between forty-four and sixty.[1]

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 . One crewman was killed.[2]

Other notes

  • Despite the fact that many other U-boats lost men due to accident, disease and various other causes, the crew of U-777 did not suffer any casualties until she was destroyed and was sunk.
  • The commander of the ship, Günter Ruperti, also commanded U-3039 during World War II, by which time he had been promoted to Kapitänleutnant. He commanded U-3039 from March 1945 to May 1945, taking up his post only about five months after U-777 was sunk.


  1. ^ a b c d e Gröner 1985, pp. 72-74.
  2. ^ U-Boat Operations of the Second World War, Volume 2: Career Histories, U511-UIT25


  • 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).  
  • Gröner, Erich (1985). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. Die deutschen Kriegsschiffe 1815-1945 (in German) III (Koblenz:  
  • U-Boat Operations of the Second World War, Volume 2: Career Histories, U511-UIT25

External links

  • Helgason, Guðmundur. "The Type VIIC boat U-777". German U-boats of WWII - Retrieved 29 December 2014. 
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