|Ordered||15 Aug 1940|
|Laid down||22 Sep 1941||Blohm & Voss, Hamburg (werk 609)|
|Launched||10 Jun 1942|
|Commissioned||30 Jul 1942||Oblt. Bernhard Müller|
|Successes||1 ship sunk, total tonnage 3,921 GRT|
Sunk on 8 March 1943 in the North Atlantic south-west of Iceland, in position 58.21N, 31.00W, by depth charges from the US Coast Guard cutter USCGC Spencer. 43 dead (all hands lost). (Axel Niestlé, May 2005).
Previously recorded fate
- Sunk 7 March, 1943 in the North Atlantic, in position 57.14N, 26.30W, by depth charges from a British Fortress aircraft (Sqdn. 220/J). (Postwar assessment)
Notes. This attack was actually against U-641 inflicting no damage.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-633 did not suffer any casualties (we know of) until the time of her loss.