|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|
Left Kiel, Germany on 20 Feb 1943.
Sunk 10 March 1943 in the North Atlantic, in position 58.51N, 19.55W, by ramming from the British merchant SS Scorton. 43 dead (all hands lost). (FDS/NHB, December 1996).
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.