|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 11 March 1945 in the Celtic Sea west of Bishop Rock, Isles of Scilly, in position 49.52.433N, 06.38.633W, by depth charges from a US Liberator aircraft (VPB-103 USN/N). 11 dead and 38 survivors.
U-681 ran hard aground while submerged near the Bishop Rock on 10 March 1945 and was forced to surface due to damage to the pressure hull and fuel tanks. The boat tried to reach the Irish coast, but was located and sunk by a Liberator aircraft the next morning.
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.
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.