December 31st - On This Date

1912	Nautilus	Submarine HMS Nautilus launched
1934	Shark	Submarine HMS Shark completed
1940	Sibyl	Submarine HMS Sibyl laid down
1940	Sea Dog	Submarine HMS Sea Dog laid down
1942	Truculent	Submarine HMS Truculent completed
1942	Ultor	Submarine HMS Ultor completed
1942	Trump	Submarine HMS Trump laid down
1959	Sealion	Submarine HMS Sealion launched
1942	HMS P311	HMS P311, only unnamed T-class boat, was due to have been named Tutenkhamen. Fitted to carry 2 human torpedoes (Chariots). Lost while engaged in Operation Principle, a chariot attack on Italian cruisers at La Maddalena. Left Scotland in November 1942 with sister-boats Thunderbolt and Trooper after addition of human torpedo deck-mounted watertight containers direct for Malta. From there, sailed with two Chariots for Operation Principle. Last signal on 31st December. Probably sunk by Italian mines in the approaches to Maddalena. Lost with all hands
1942	HMS Unrivalled	HMS Unrivalled torpedoes and sinks the Italian merchant Maddalena south-east of Mehedia, Tunisia.
1944	HMS Shakespeare	HMS Shakespeare torpedoes and sinks the Japanese merchant cargo ship Unryu Maru east of Port Blair, Andaman Islands.
1944	HMS Trenchant	HMS Trenchant sinks two Japanese sailing vessels with gunfire in the Malacca Strait.
1974	HMCS Rainbow	HMCS Rainbow paid off Esquimalt BC. Last Canadian Pacific Fleet submarine until 2003