List of all U-boats




Ordered20 Jan 1941
Laid down1 Dec 1941 Blohm & Voss, Hamburg (werk 620)
Launched20 Aug 1942
Commissioned15 Oct 1942Oblt. Kurt Jensen
15 Oct 1942 - 7 Apr 1943  Oblt. Kurt Jensen
1 patrol
15 Oct 1942-31 Mar 1943  5. Flottille (training)
1 Apr 1943-7 Apr 1943  11. Flottille (active service)
SuccessesNo ships sunk or damaged

Sunk 7 April 1943 in the Norwegian Sea south-west of Jan Mayen Island, in position 69.38N, 05.40W, by torpedoes from the British submarine HMS Tuna. 45 dead (all hands lost).

Loss position

View the 1 war patrol

Wolfpack operations

U-644 operated with the following Wolfpacks during its career:
   Eisbär (27 Mar 1943 - 7 Apr 1943)

Men lost from U-boats

Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-644 did not suffer any casualties (we know of) until the time of her loss.

Media links

German U-Boat Losses During World War II

Niestle, Axel

U-Boat Operations of the Second World War - Vol 2

Wynn, Kenneth

Hitler's U-boat War, Vol II

Blair, Clay

Submarines versus U-boats

Jones, Geoffrey

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