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On This Day - August 20

1917E47Lost for reasons unknown.
1934Grampus (N56)Laid Down
1940Cachalot (N83)Torpedoed and sunk U-51 in the Bay of Biscay west of Nantes, France.
1940Undaunted (N55)Launched
1941Thrasher (N37)HMS Thrasher sinks the Greek sailing vessel San Stefano with gunfire off Cape Malea, Greece.
1941Unique (N95)HMS Unique torpedoes and sinks the Italian troop tansport Esperia 11 nautical miles off the Tripoli lighthouse, Libya.
1941Upholder (N99)HMS Upholder torpedoes and sinks the Italian merchant Enotria 5 nautical miles off Cape San Vito, Italy.
1943O24 (Dutch)Torpedoed and sank the Japanese auxiliary gunboat Chosa Maru 8 nautical miles southwest of Penang, Malaya. The Chosa Maru had left Penang a few hours before when the Japanese heard of the attack on the German Quito the day before.
1944Satyr (P214)HMS Satyr fires four torpedoes against the German merchants Bochum and Emma Sauber off Skudesnes, Norway. All torpedoes missed their targets.
1962Otter (S15)Commissioned
2015Artful (S121)Arrived at Faslane for the first time

LossesSubmarine Badges