|Ordered||25 Aug 1941|
|Laid down||18 Nov 1942||Howaldtswerke AG, Kiel (werk 32)|
|Launched||8 Jan 1944|
|Commissioned||18 Mar 1944||Kptlt. Horst Creutz|
|Successes||No ships sunk or damaged|
Sunk during mid-December 1944 on the British minefield 'HW A3' in position 50°33,16’n / 05°11.37’w off the Cornish coast. 50 dead (all hands lost). (Dr. Axel Niestlé, 2010).
July 4, 2007
Published the article The loss of U 325, U 400 and U 1021 by Dr. Axel Niestlé. This article explains the loss of this boat.
Previously recorded fate
- Sunk during mid-December 1944 on the British minefield »HY A1« in position 50°39,9’n / 05°05’w off the Cornish coast. (Dr. Axel Niestlé, May 2007)
- Sunk 17 Dec, 1944 in the North Atlantic south of Cork, in position 51.16N, 08.05W, by depth charges from the British frigate HMS Nyasaland. (Dr. Axel Niestlé, 1998)
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-400 did not suffer any casualties (we know of) until the time of her loss.