|Ordered||20 Jan 1941|
|Laid down||22 May 1942||Flensburger Schiffsbau-Ges, Flensburg (werk 485)|
|Launched||16 Apr 1943|
|Commissioned||16 Jul 1943||Oblt. Bruno Langenberg|
|Successes||No ships sunk or damaged|
Sunk on 5 March 1944 in the Norwegian Sea north-west of Hammerfest, in position 72.10N, 14.45E, by rockets from a Swordfish aircraft (816 Sqn FAA/F) of the British escort carrier HMS Chaser. 50 dead (all hands lost).
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-366 did not suffer any casualties (we know of) until the time of her loss.
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