|Ordered||5 Jun 1941|
|Laid down||13 Jun 1942||Howaldtswerke Hamburg AG, Hamburg (werk 826)|
|Launched||6 Jul 1943|
|Commissioned||20 Sep 1943||Oblt. Paul Weber|
|Successes||No ships sunk or damaged|
Destroyed 5 April, 1945 at the Howaldtswerke yard in Hamburg, by British bombs
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-677 did not suffer any casualties (we know of) until the time of her loss.