|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.
- Sunk 10 March 1943 in the North Atlantic, in position 58.51N, 19.55W, by ramming from the British merchant SS Scorton.
Wolfpack operationsSchnorchel 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-633 did not suffer any casualties (we know of) until the time of her loss.