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|Ordered:||20 January 1941|
|Laid down:||14 May 1942|
|Launched:||18 February 1943|
|Commissioned:||3 April 1943|
|Status:||Missing since 17 May 1944|
|Class and type:||Type VIIC submarine|
|Height:||9.60 m (31 ft 6 in)|
|Draught:||4.74 m (15 ft 7 in)|
|Complement:||4 officers, 40–56 enlisted|
|Operations:||13–17 May 1944|
German submarine U-240 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 14 May 1942 at the Friedrich Krupp Germaniawerft yard at Kiel as yard number 670, launched on 18 February 1943 and commissioned on 3 April 1943 under the command of Oberleutnant zur See Günther Link.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-240 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).
The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph). When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-240 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.
The U-boat was listed as missing in the North Sea west of Norway from 17 May 1944. No definite explanation exists for her loss, but Sunderland JM667/V of 330 Norwegian Squadron (RAF Coastal Command) attacked and sank an unidentified U-boat in that area on 16th May. This is believe to be the U-240.
U-240 was originally thought to have been sunk west of Norway by depth charges dropped by a Norwegian Short Sunderland flying boat of No. 330 Squadron RAF. The attack was against U-668. No damage was caused.
deep sea hunters by Martin W Bowmanwas invoked but never defined (see the help page).