|Ordered||16 Jul 1942|
|Laid down||10 Sep 1942||Flender Werke AG, Lübeck (werk 330)|
|Launched||7 Aug 1943|
|Commissioned||25 Sep 1943||Ltnt. Detlev Fritz|
|Successes||No ships sunk or damaged|
Scuttled on 4 May 1945 in the U-boat base at Eckernförde. (Axel Niestlé, January 1991).
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-904 did not suffer any casualties (we know of) until the time of her loss.