|Ordered||23 Sep 1939|
|Laid down||8 Apr 1940||Danziger Werft AG, Danzig (werk 102)|
|Launched||16 Dec 1940|
|Commissioned||10 Apr 1941||Kptlt. Gero Zimmermann|
|Successes||No ships sunk or damaged|
Sunk 3 Aug 1941 in the North Atlantic south-west of Ireland, in position 50.27N, 19.50W, by depth charges from the British destroyer HMS Wanderer and the Norwegian destroyer St. Albans and the British corvette HMS Hydrangea. 45 dead (all hands lost).
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-401 did not suffer any casualties (we know of) until the time of her loss.