German submarine U-864

History
Nazi Germany
NameU-864
Ordered5 June 1941
BuilderDeSchiMAG AG Weser, Bremen
Yard number1070
Laid down15 October 1942
Launched12 August 1943
Commissioned9 December 1943
FateSunk with all hands on 9 February 1945 by HMS Venturer, North Sea west of Bergen
General characteristics
Class and typeType IXD2 submarine
Displacement
  • 1,610 t (1,580 long tons) surfaced
  • 1,799 t (1,771 long tons) submerged
Length
Beam
  • 7.50 m (24 ft 7 in) o/a
  • 4.40 m (14 ft 5 in) pressure hull
Height10.20 m (33 ft 6 in)
Draught5.35 m (17 ft 7 in)
Propulsion
  • 9,000 PS (8,900 shp; 6,600 kW) surfaced
  • 1,000 PS (990 shp; 740 kW) submerged
Speed
  • 20.8 kn (38.5 km/h; 23.9 mph) surfaced
  • 6.9 kn (12.8 km/h; 7.9 mph) submerged
Range
  • 12,750 nmi (23,610 km; 14,670 mi) at 10 kn (19 km/h; 12 mph) surfaced
  • 57 nmi (106 km; 66 mi) at 4 kn (7.4 km/h; 4.6 mph) submerged
Test depthCalculated crush depth: 230 m (754 ft 7 in)
Boats & landing
craft carried
2 dinghies
Complement55–63 officers & ratings
Armament
Service record
Part of:
Identification codes: M 54 842
Commanders:
  • K.Kapt. Ralf-Reimar Wolfram
  • 9 December 1943 – 9 February 1945
Operations:
  • 1 patrol:
  • 7 – 9 February 1945
Victories: None

German submarine U-864 was a Type IXD2 U-boat of Nazi Germany's Kriegsmarine in World War II. On 9 February 1945, she became the only submarine in history to be sunk by an enemy submarine while both were submerged. U-864 was sunk by the British submarine HMS Venturer, and all 73 men on board died.