HMS Graph

HMS Graph (pennant number P715) was a German Type VIIC U-boat captured and recommissioned by the British Royal Navy during World War II.

HMS Graph in 1943
History
Nazi Germany
NameU-570
Ordered24 October 1939
BuilderBlohm & Voss, Hamburg
Yard number546
Laid down21 May 1940
Launched20 March 1941
Commissioned15 May 1941
CapturedCaptured by the Royal Navy on 27 August 1941
United Kingdom
NameHMS Graph
NamesakeGraph
Acquired27 August 1941
Commissioned5 October 1941
Decommissioned21 June 1943
Fate
  • Ran aground on 20 March 1944
  • Scrapped in 1961
General characteristics
Class and typeType VIIC submarine
Displacement
  • 769 tonnes (757 long tons) surfaced
  • 871 t (857 long tons) submerged
Length67.10 m (220 ft 2 in)
Beam6.20 m (20 ft 4 in)
Draught4.74 m (15 ft 7 in)
Propulsion
  • Two Blohm and Voss Diesel engines, 1,440 metric horsepower (1,060 kW; 1,420 shp; 1,060 kW) each
  • One 465 kW electric motor and one 276 kW electric motor
Speed
  • 17.7 knots (32.8 km/h; 20.4 mph) surfaced
  • 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range8,500 nmi (15,700 km; 9,800 mi)
Test depth230 m (750 ft)
Armament
  • 5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern)
  • 14 × torpedoes or 26 TMA mines
  • 1 × 8.8 cm (3.46 in) deck gun (220 rounds)
  • various AA guns
Service record (Kriegsmarine)
Part of:
Identification codes: M 42 381
Commanders:
  • Kptlt. Hans-Joachim Rahmlow
  • 15 May – 27 August 1941
Operations:
  • 1 patrol:
  • 23 – 29 August 1941
Victories: None
Service record (Royal Navy)
Commanders:
  • Lt. George Robson Colvin
  • 31 August – 10 October 1941
  • Lt. Edward Dudley Norman
  • 10 October 1941 – 1 June 1942
  • Lt. Peter Barnsley Marriott
  • 1 June 1942 – 2 April 1943
  • Lt. David Swanston
  • 3 April – 21 June 1943

Commissioned as U-570 in Nazi Germany's Kriegsmarine in mid-1941, she was attacked and captured on her first patrol. She provided the Royal Navy and United States Navy with useful information about German submarines. Refitted for use by the Allies, she carried out three combat patrols with a Royal Navy crew, becoming the only U-boat to see active service with both sides during the war. She was withdrawn from service in 1944 due to problems maintaining her. While being towed to the breakers for scrapping, she ran aground on the Isle of Islay, off the west coast of Scotland. Some of the wreckage was removed as scrap but some remains to the present day.

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