|Ordered||5 Jun 1941|
|Laid down||21 Jun 1943||F. Krupp Germaniawerft AG, Kiel (werk 691)|
|Launched||20 Apr 1944|
|Commissioned||20 May 1944||Oblt. Günther Lüth|
|Successes||No ships sunk or damaged|
Surrendered on 9 May 1945 at Bergen, Norway (Waller & Niestlé, 2010).
Transferred to Loch Ryan, Scotland on 30 May, 1945.
Allocated to USSR by the TNC. Arrived Libau (Latvia) on 4 Dec 45 with RN Pennant No: N.22. Allocated to Baltic Fleet on 13 Feb 46. Renamed S-81 on 9 Jun 49. Allocated as a test hulk to the Northern Fleet for atomic bomb tests in Sep 55. Transferred to the White Sea in 1956 as a test hulk. Heavily damaged in the Barents Sea off Novaja Zemlja on 24 Sep 57 during atomic bomb test. Struck from Soviet Navy list on 16 Oct 57. Broken-up for scrap.
This boat was fitted with a Schnorchel underwater-breathing apparatus and sailed equipped with it in April 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-1057 did not suffer any casualties (we know of) until the time of her loss.