German submarine U-171

U-505, a typical Type IXC boat
History
Nazi Germany
NameU-171
Ordered23 December 1939
BuilderDeSchiMAG AG Weser, Bremen
Yard number1011
Laid down1 December 1940
Launched22 July 1941
Commissioned25 October 1941
FateSunk by a mine 9 October 1942 in the Bay of Biscay. 22 crew killed, 30 survivors.
General characteristics
Class & typeType IXC submarine
Displacement
  • 1,120 t (1,100 long tons) surfaced
  • 1,232 t (1,213 long tons) submerged
Length
Beam
  • 6.76 m (22 ft 2 in) o/a
  • 4.40 m (14 ft 5 in) pressure hull
Height9.60 m (31 ft 6 in)
Draught4.70 m (15 ft 5 in)
Installed power
  • 4,400 PS (3,200 kW; 4,300 bhp) (diesels)
  • 1,000 PS (740 kW; 990 shp) (electric)
Propulsion
Speed
  • 18.3 knots (33.9 km/h; 21.1 mph) surfaced
  • 7.7 knots (14.3 km/h; 8.9 mph) submerged
Range
  • 13,450 nmi (24,910 km; 15,480 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 64 nmi (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Complement4 officers, 44 enlisted
Armament
Service record
Part of:
Identification codes: M 29 121
Commanders:
  • Kptlt. Günther Pfeffer
  • 25 October 1941 – 9 October 1942
Operations:
  • 1 patrol:
  • 17 June – 9 October 1942
Victories: 3 merchant ships sunk
(17,641 GRT)

German submarine U-171 was a Type IXC U-boat of Germany's Kriegsmarine built for service during World War II. It was laid down on 1 December 1940 at the DeSchiMAG AG Weser yard at Bremen as yard number 1011, launched on 22 July 1941, and commissioned on 25 October 1941 under the command of Kapitänleutnant Günther Pfeffer.

After training with the 4th U-boat Flotilla, U-171 was transferred to the 10th U-boat Flotilla for front-line service on 1 July 1942. It was sent to patrol in the Gulf of Mexico. It was sunk by a naval mine in the Bay of Biscay 115 days into its first and only patrol, whilst returning to Lorient in occupied France, with the loss of 22 of its crew of 54. For many years it was believed U-166 was sunk by an American aircraft in what was, in reality, an unsuccessful attack on U-171 in the Gulf of Mexico.