|Ordered||20 Jan 1941|
|Laid down||14 May 1942||F. Krupp Germaniawerft AG, Kiel (werk 670)|
|Launched||18 Feb 1943|
|Commissioned||3 Apr 1943||Oblt. Günther Link|
|Successes||No ships sunk or damaged|
Missing since 15 May 1944 in the Norwegian Sea. No explanation exists for its loss. 50 dead (all hands lost). (Axel Niestlé, February 1998).
U-240 was on transfer from Kiel to Narvik with three other U-boats that were all ordered to operate against naval forces sighted north-west of Trondheim on 15 May 1944. The boat was reported missing on 17 May 1944 after failing to report its position. No radio messages were received from U-240 and it was last seen after being released by the local escorts off Bergen at 22.45 hours on 14 May 1944.
Previously recorded fate
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-240 did not suffer any casualties (we know of) until the time of her loss.