|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|
Listed as missing in the North Sea west of Norway on 17 May 1944.
No explanation exists for its loss. 50 dead (all hands lost). (Axel Niestlé, February 1998).
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.