HMS Graph
HMS Graph in 1943
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| History | |
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 Nazi Germany
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| Name: | U-570 |
| Ordered: | 24 October 1939 |
| Builder: | Blohm & Voss, Hamburg |
| Yard number: | 546 |
| Laid down: | 21 May 1940 |
| Launched: | 15 April 1941 |
| Commissioned: | 15 May 1941 |
| Captured: | by the Royal Navy, 27 August 1941 |
 United Kingdom
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| Name: | HMS Graph |
| Namesake: | Graph |
| Acquired: | 27 August 1941 |
| Commissioned: | 19 September 1941 |
| Decommissioned: | February 1944 |
| Fate: | Ran aground, 20 March 1944 |
| General characteristics | |
| Class and type: | Type VIIC submarine |
| Displacement: |
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| Length: | 67.10 m (220 ft 2 in) |
| Beam: | 6.20 m (20 ft 4 in) |
| Draught: | 4.74 m (15 ft 7 in) |
| Propulsion: |
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| Speed: |
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| Range: | 8,500 nmi (15,700 km; 9,800 mi) |
| Test depth: | 230 m (750 ft) |
| Armament: |
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| Service record | |
| Part of: |
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| Commanders: |
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| Victories: | None |
HMS Graph (pennant number P715) was a German Type VIIC U-boat that the British Royal Navy captured during World War II. Commissioned as U-570 in Nazi Germany's Kriegsmarine in mid-1941, she was attacked and captured on her first patrol.
She provided both the Royal Navy and United States Navy with significant information on German submarines, and 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 She was withdrawn from service in 1944 due to problems maintaining her.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 an island off the west coast of Scotland. Some of the wreck was removed as scrap but some wreckage remains there to the present day.
The submarine was built to the German Type VIIC design. She had a displacement of 769 tonnes (757 long tons) when surfaced, and 871 t (857 long tons) when submerged. The boat was 67.10 metres (220 ft 2 in) long, with a beam of 6.2 metres (20 ft 4 in), and a draught of 4.74 metres (15 ft 7 in). The diesel-electric propulsion system provided a maximum speed of 18.8 knots (34.8 km/h; 21.6 mph) surfaced or 7.6 knots (14.1 km/h; 8.7 mph) submerged. The U-570 had a fuel capacity of 109 long tons (111 t) which gave a range of 7,500 nmi (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph). The test depth of the submarine was 230 metres (750 ft).
Her main armament consisted of five 53.3 centimetres (21 in) torpedo tubes; four in the bow, and a fifth in the stern. She could carry a total of 14 torpedoes – five in the torpedo tubes, seven reloads inside the pressure hull, and a further two torpedoes in water–tight canisters outside the pressure hull. The boat was fitted with a 8.8cm C/35 deck gun (with around 150 rounds of ammunition), and a 2cm Flak 30 anti-aircraft gun. A 28 cm stereoscopic rangefinder supported the anti-aircraft gun; she also carried several machine guns.
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