December 21st - On This Date

929	Odin	Submarine HMS Odin completed
1934	Sealion	Submarine HMS Sealion completed
1936	Thetis	Submarine HMS Thetis laid down
1936	Thunderbolt	Submarine HMS Thunderbolt laid down
1942	Sportsman	Submarine HMS Sportsman completed
1944	Spearhead	Submarine HMS Spearhead completed
1961	Opossum	Submarine HMS Opossum laid down
1982	Torbay	Submarine HMS Torbay laid down
1986	Pactolus	Depot Ship HMS Pactolus launched
1942	HMS Safari	HMS Safari sinks the Italian auxiliary minesweeper Rosina S. about 5 nautical miles south of Hammamet, Tunisa.
1943	HMS Sportsman	HMS Sportsman attacks and damages the Greek sailing vessel Spiridon with gunfire south of Lemnos island.
1944	HMS L26	HMS L-26 paid off Halifax NS
1944	HMS Trenchant	HMS Trenchant sinks two Japanese landing craft with gunfire off the eastern coast of Sumatra.