Events
On This Day - July 15
| 1916 | H 3 | Submarine H3 was on patrol in the Adriatic. While attempting to penetrate the Austrian anchorage at Cattaro on 15th July 1916 she struck a mine which exploded, seriously damaging H3, which then sank with the loss of all hands. |
| 1916 | K 4 | Launched |
| 1919 | H 49 | Launched |
| 1941 | Taku (N 38) | HMS Taku sinks the Italian auxiliary minesweeper Vincenso P. about 25 nautical miles south-east of Auegia, Libya. |
| 1941 | Unbeaten (N 93) | HMS Unbeaten sinks two sailing vessels with gunfire at Marsa Zuag roads, Libya. |
| 1941 | P 33 | HMS P 33 torpedoes and sinks the Italian merchant Barbarigo off Pantellaria Island. During a counter attack P 33 was damaged by the Italian torpedo boat Procione. |
| 1943 | United (P 44) | The Italian submarine Remo was torpedoed and sunk in the Gulf of Taranto by the British submarine HMS United |
| 1945 | Supreme (P 252) | HMS Supreme sinks three Japanese coasters with gunfire in the Gulf of Siam. |
| 1945 | Trenchant (P 331) | HMS Trenchant sinks three small Japanese vessels with gunfire north-east of the Lombok Strait. |
| 1970 | Churchill (S 46) | Completed |
| 1971 | Dolphin badges | Submarine Dolphin badges first issued. |
| 2012 | Turbulent (S 87) | Decommisioned at Her Majesty's Naval Base Devonport |
