Events
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On This Day - March 15
| 1907 | C 10 (I 30) | Launched |
| 1910 | D 3 (I 73) | Laid Down |
| 1910 | St George 1891 - 1920 | Recommissioned as Depot Ship |
| 1916 | V 4 | Completed |
| 1934 | Clyde (N 12) | Launched |
| 1940 | Trusty (N 45) | Laid Down |
| 1940 | Turbulent (N 98) | Laid Down |
| 1940 | Sterlet (N 22) | Ordered to return to Harwich, docking on the 16th of March |
| 1941 | Umbra (P 35) | Launched |
| 1942 | X 3 (Piker) | Launched |
| 1943 | Trooper (N 91) | HMS Trooper fires 4 torpedoes against the Italian merchant Belluno about 30 nautical miles south of Isola di Capri, Italy. All torpedoes missed. |
| 1945 | Scythian (P 237) | HMS Scythian sinks two Japanese sailing vessels with gunfire of the Mergui Archipel, Burma. |
| 1955 | The 6th Submarine Flotilla | The 6th Submarine Flotilla was formed and was based at Halifax, Nova Scotia. |
| 1956 | Narwhal (S 03) | Laid Down |
| 1968 | Revenge (S 27) | Launched |
