|Ordered||25 Aug 1941|
|Laid down||21 Oct 1942||Howaldtswerke Hamburg AG, Hamburg (werk 830)|
|Launched||20 Nov 1943|
|Commissioned||3 Feb 1944||Oblt. Helmut Bach|
|Successes||No ships sunk or damaged|
Sunk at 0930hrs on 10 March, 1945 in the English Channel west of Isles of Scilly, in position 49.52.433N, 06.38.633W, by depth charges from a US Liberator aircraft (VPB-103). 11 dead and 38 survivors.
The boat struck a rock while submerged near the Bishop Rock and was forced to surface and was then attacked by the Liberator aircraft. It sank roughly 4 miles to the north-east of the Isles of Scilly.
This boat was fitted with a Schnorchel underwater-breathing apparatus and sailed equipped with it in February 1945 but it was of course installed prior to that date. Read more about the Schnorchel and see list of fitted boats.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-681 did not suffer any casualties (we know of) until the time of her loss.