List of all U-boats




Ordered25 Aug 1941
Laid down18 Nov 1942 Howaldtswerke AG, Kiel (werk 32)
Launched8 Jan 1944
Commissioned18 Mar 1944Kptlt. Horst Creutz
18 Mar 1944 - 15 Dec 1944  Kptlt. Horst Creutz
1 patrol
18 Mar 1944-31 Oct 1944  5. Flottille (training)
1 Nov 1944-15 Dec 1944  11. Flottille (active service)
SuccessesNo ships sunk or damaged

Sunk after 14 December 1944 in the Celtic Sea north-west of Newquay, in position 50.33,16N, 05.11,37W, by a mine in the British field HW A3. 50 dead (all hands lost). (Axel Niestlé, July 2008).

Loss position

View the 1 war patrol

The article The loss of U 325, U 400 and U 1021 by Dr. Axel Niestlé explains the loss of this boat.

Reassessment of this wreck
See the following PDF file for more details on further research into this wreck.

Niestlé, Axel (2010). The ‘Atlas’ Survey Zone: Deep-sea Archaeology & U-boat Loss Reassessments, Oddyssey Marine Exploration

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)
    Notes. This attack sank the U-772 instead.

Schnorchel-fitted U-boat

This boat was fitted with a Schnorchel underwater-breathing apparatus in October 1944.

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-400 did not suffer any casualties (we know of) until the time of her loss.

U-boat Emblems

We have 1 emblem entry for this boat. See the emblem page for this boat or view emblems individually below.

Stork on Shield

Media links

German U-Boat Losses During World War II

Niestle, Axel

U-Boat Operations of the Second World War - Vol 1

Wynn, Kenneth

Hitler's U-boat War, Vol II

Blair, Clay

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