Events
On This Day - March 15
| 1907 | C10 | Launched |
| 1910 | D3 | Laid Down |
| 1910 | 1891 - 1920: St George | Recommissioned as Depot Ship |
| 1916 | V4 | Completed |
| 1934 | Clyde (N12) | Launched |
| 1940 | Trusty (N45) | Laid Down |
| 1940 | Turbulent (N98) | Laid Down |
| 1941 | Umbra (P35) | Launched |
| 1942 | X3 | Launched |
| 1943 | Trooper (N91) | 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 (P237) | 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 (N45) | Laid Down |
| 1968 | Revenge (S27) | Launched |
