Type: VII-C
Built by: Bremer Vulkan (Vegesak)
Launched: 28 April, 1941
Commissioned: 5 July, 1941
Feldpost Nr.: M43319
Sunk: 14 March, 1942
Sunk by: struck a mine
Location sunk: off Salamis
Position sunk: 38.00N x 24.00E (all hands lost, 45 men)

The first Skipper of U-133 was Kapitänleutnant Hermann Hesse who later commanded U-194 where he was killed. In February 1942, command passed to Oberleutnant zur See Eberhard Mohr who had come from U-148; he was lost with the boat.

U-133 was assigned to the 7th U-BootFlotilla based at St. Nazaire, France. She had one patrol in the North Atlantic then a successful break-through of the Straits of Gibraltar into the Mediterranean over the night of 21-22 December, 1941. On 14 March, 1942 the boat struck a mine outside Salamis Harbor and it is believed to have been a German mine - possibly one of her own.

SHIPS SUNK BY U-133 UNDER HESSE
16.01.42	unknown	destroyer	unknown
(U-133 fired four torpedoes at an un-named destroyer. Two detonated prematurely and another after three minutes run time. they assumed a damaging hit on a destroyer, but there was no confirmation.)
17.01.42	HMS GURKHA	Brit DD	1,920 GRT