|Ordered||6 Nov 1943|
|Laid down||29 Jul 1944||F Schichau GmbH, Danzig (werk 1654)|
|Launched||27 Sep 1944|
|Commissioned||29 Jan 1945||Oblt. Karl-Heinz Voswinkel|
|Successes||No ships sunk or damaged|
Damaged by bombs in September 1944 in an air raid on the building slips. Repaired and completed.
Scuttled on 3 May 1945 in the western Weser estuary.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-3509 did not suffer any casualties (we know of) until the time of her loss.
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