German submarine U-859

History
Nazi Germany
Name:	U-859
Ordered:	5 June 1941
Builder:	DeSchiMAG AG Weser, Bremen
Yard number:	1065
Laid down:	15 May 1942
Launched:	2 March 1943
Commissioned:	8 July 1943
Fate:	Sunk 23 September 1944 by HMS Trenchant, near Penang
General characteristics
Class and type:	Type IXD2 U-boat
Displacement:	1,610 t (1,580 long tons) surfaced 1,799 t (1,771 long tons) submerged
Length:	87.58 m (287 ft 4 in) o/a 68.50 m (224 ft 9 in) pressure hull
Beam:	7.50 m (24 ft 7 in) o/a 4.40 m (14 ft 5 in) pressure hull
Height:	10.20 m (33 ft 6 in)
Draught:	5.35 m (17 ft 7 in)
Installed power:	9,000 PS (6,620 kW; 8,880 bhp) (diesels) 1,000 PS (740 kW; 990 shp) (electric)
Propulsion:	2 shafts 2 × diesel engines 2 × electric motors
Speed:	20.8 knots (38.5 km/h; 23.9 mph) surfaced 6.9 knots (12.8 km/h; 7.9 mph) submerged
Range:	12,750 nmi (23,610 km; 14,670 mi) at 10 knots (19 km/h; 12 mph) surfaced 57 nmi (106 km; 66 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth:	Calculated crush depth: 230 m (750 ft)
Boats & landing craft carried:	2 dinghies
Complement:	55–64 officers & ratings
Armament:	6 × torpedo tubes (four bow, two stern) 24 × 53.3 cm (21 in) torpedoes 1 × 10.5 cm (4.1 in) SK L/45 deck gun (150 rounds) anti-aircraft guns
Service record
Part of:	4th U-boat Flotilla 8 July 1943 – 31 March 1944 12th U-boat Flotilla 1 April – 23 September 1944
Commanders:	Kptlt. Johann Jebsen 8 July 1943 – 23 September 1944
Operations:	1st patrol: 8 April – 23 September 1944
Victories:	3 commercial ships sunk (20,853 GRT)

German submarine U-859 was a Type IXD2 U-boat built for Nazi Germany's Kriegsmarine during World War II. She was one of a select number of U-boats to join Monsun Gruppe or Monsoon Group, which operated in the Far East alongside the Imperial Japanese Navy.

U-859 was built in Bremen during 1942 and 1943, and was heavily adapted following her completion in July 1943, with the addition of a snorkel to enable her to stay underwater for longer during the hazardous passage to Penang in Malaya. Thus she was not ready for war service until the spring of 1944, when following her working up period and modifications she departed Kiel for the East.

German Type IXD2 submarines were considerably larger than the original Type IXs. U-859 had a displacement of 1,610 tonnes (1,580 long tons) when at the surface and 1,799 tonnes (1,771 long tons) while submerged. The U-boat had a total length of 87.58 m (287 ft 4 in), a pressure hull length of 68.50 m (224 ft 9 in), a beam of 7.50 m (24 ft 7 in), a height of 10.20 m (33 ft 6 in), and a draught of 5.35 m (17 ft 7 in). The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines plus two MWM RS34.5S six-cylinder four-stroke diesel engines for cruising, producing a total of 9,000 metric horsepower (6,620 kW; 8,880 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 shaft horsepower (1,010 PS; 750 kW) for use while submerged. She had two shafts and two 1.85 m (6 ft) propellers. The boat was capable of operating at depths of up to 200 metres (660 ft).

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