German submarine U-340

The submarine was laid down on 1 October 1941 at the Nordseewerke yard at Emden, launched on 20 August 1942, and commissioned on 16 October 1942 under the command of Oberleutnant zur See Hans-Joachim Klaus. U-340 served with the 8th U-boat Flotilla, for training and then with the 6th U-boat Flotilla for operational service from 1 May to 2 November 1943.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-340 had a displacement of 769 tonnes when at the surface and 871 tonnes while submerged. She had a total length of 67.10 m , a pressure hull length of 50.50 m , a beam of 6.20 m , a height of 9.60 m , and a draught of 4.74 m . 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 for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750 metric horsepower for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 metres .

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