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On This Day - December 31

191Nautilus (N1)Launched
193Shark (N54)Completed
193Undine (N48)HMS Undine departed Blyth for her 4th war patrol. She was ordered to patrol in the Heligoland Bight.
194Sea Dog (P216)Laid Down
194Sibyl (P217)Laid Down
194P311HMS P311, only unnamed T-class boat, was due to have been named Tutenkhamen. Fitted to carry human torpedoes (Chariots). Lost while engaged in Operation Principal, 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 Chariots for Operation Principle. Last signal on 31st December. Probably sunk by Italian mines in the approaches to Maddalena. Lost with all hands
194Unrivalled (P45)HMS Unrivalled torpedoes and sinks the Italian merchant Maddalena south-east of Mehedia, Tunisia.
194Truculent (P315)Completed
194Trump (P333)Laid Down
194Ultor (P53)Completed
194Shakespeare (P221)HMS Shakespeare torpedoes and sinks the Japanese merchant cargo ship Unryu Maru east of Port Blair, Andaman Islands.
194Trenchant (P331)HMS Trenchant sinks two Japanese sailing vessels with gunfire in the Malacca Strait.
195Sealion (N72)Launched
197HMCS Rainbow HMCS Rainbow paid off Esquimalt BC. Last Canadian Pacific Fleet submarine until 2003

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