November 20th - On This Date - RN Submarine Service

1917	H33	Submarine HMS H33 laid down
1917	H34	Submarine HMS H34 laid down
1917	H47	Submarine HMS H47 laid down
1940	Unbeaten	Submarine HMS Unbeaten completed
1976	Sceptre	Submarine HMS Sceptre launched
1943	HMS Sibyl	HMS Sibyl sinks two Greek sailing vessels with gunfire in the Gulf of Saloniki, Greece.
1944	HMS Spark	HMS Spark sinks a Japanese sailing vessel with gunfire of the Mergui Archipelago, Burma.
1944	HMS Tally-Ho	HMS Tally-Ho sinks the Japanese auxiliary minelayer Ma 4 about 30 nautical miles east of the southern tip of Great Nicobar Island.
2009	HMS Astute	Arrived at Faslane for the first time. The submarine's arrival on the Clyde marks the beginning of a process that will see Faslane become the UK's sole operating submarine base over the next decade.