List of all U-boats




Ordered25 May 1941
Laid down30 Oct 1942 Blohm & Voss, Hamburg (werk 191)
Launched24 Jun 1943
Commissioned29 Jul 1943Oblt. Diethelm Balke
29 Jul 1943 - 9 May 1945  Kptlt. Diethelm Balke (German Cross in Gold)
1 patrol
29 Jul 1943-31 Aug 1944  5. Flottille (training)
1 Sep 1944-8 May 1945  11. Flottille (active service)
SuccessesNo ships sunk or damaged

Surrendered on 9 May 1945 at Bergen, Norway (Waller & Niestlé, 2010).

Transferred to Loch Ryan on 2 June 1945.

Operation Deadlight (post-war Allied operation, info)
Sunk on 11 Dec, 1945 in position 56.10N, 10.05W.

Final location

View the 1 war patrol

Schnorchel-fitted U-boat

This boat was fitted with a Schnorchel underwater-breathing apparatus in August 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-991 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.

Diving Eagle

Media links

The Grey Wolves of Eriboll

David M. Hird

The Royal Navy and German Naval Disarmament, 1942-1947

Madsen, Chris
($ 58.77)

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

Wynn, Kenneth

Hitler's U-boat War, Vol II

Blair, Clay

German U-Boat Losses During World War II

Niestle, Axel

As an Amazon Associate earns a commission from qualifying purchases.