November 7th - On This Date - RN Submarine Service

1940	HMS Swordfish	Believed sunk by mine HMS Swordfish sailed from Portsmouth on 7th November 1940 for a patrol in the North Sea. Nothing was heard from the Swordfish after her departure despite efforts on the 15th and 16th to have her report her position. It was believed at the time that she had fallen victim to a German destroyer in the vicinity of Brest. This belief remained until 1983 when her wreck was discovered off the Isle of Wight at a depth of 150 feet. It is now clear that the submarine struck a mine shortly after sailing from Portsmouth.
1941	HMS Trident	HMS Trident fires three torpedoes against the German minesweeper depot ship MRS 3/Bali north of the Laksefjorden. The torpedoes missed.
1942	HMS Unruffled	HMS Unruffled torpedoes and damages the Italian light cruiser Attilio Regolo off Cape San Vito, Sicily. Unruffled could not finish off the ship since they ran out of torpedoes.