|Ordered||25 May 1941|
|Laid down||30 Oct 1942||Blohm & Voss, Hamburg (werk 191)|
|Launched||24 Jun 1943|
|Commissioned||29 Jul 1943||Oblt. Diethelm Balke|
|Successes||No 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)
This boat was fitted with a Schnorchel underwater-breathing apparatus in August 1944.
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.
We have 1 emblem entry for this boat. See the emblem page for this boat or view emblems individually below.
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