Events
On This Day - November 20
| 1915 | E 11 (I 91) | Sank the Gunboat Sevket Numa in the Sea of Marmara. |
| 1917 | H 33 | Laid Down |
| 1917 | H 34 | Laid Down |
| 1917 | H 47 | Laid Down |
| 1937 | O 22 (Dutch) | Laid Down |
| 1939 | Undine (N 48) | HMS Undine departed Rosyth for Blyth where she arrived later the same day. |
| 1939 | Sturgeon (N 73) / Zeehond (Dutch) | Sank the anti-submarine trawler Gauleiter Telshow, This was the first British submarine success of WWII. |
| 1939 | Sterlet (N 22) | Arrived at Newcastle-on-Tyne where she started her re-fit at the Swan Hunter shipyard. The work was scheduled to take around a fortnight. |
| 1940 | Unbeaten (N 93) | Completed |
| 1943 | Sibyl (P 217) | HMS Sibyl sinks two Greek sailing vessels with gunfire in the Gulf of Saloniki, Greece. |
| 1944 | Spark (P 236) | HMS Spark sinks a Japanese sailing vessel with gunfire of the Mergui Archipelago, Burma. |
| 1944 | Tally-Ho (P 317) | HMS Tally-Ho sinks the Japanese auxiliary minelayer Ma 4 about 30 nautical miles east of the southern tip of Great Nicobar Island. |
| 1976 | Sceptre (S 104) | Launched |
| 2009 | Astute (S 119) | 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. |
