| 1900 | 1898 - 1921: Rosario | Commissioned at Sheerness on 20 March, 1900 for service on the China Station |
| 1909 | C19 | Launched |
| 1909 | C26 | Launched |
| 1914 | W4 | Laid Down |
| 1917 | H27 | Laid Down |
| 1918 | H26 | Completed |
| 1941 | Graph (P715) | Launched |
| 1942 | X3 | Completed |
| 1944 | Graph (P715) | Lost when she ran aground on the west coast of the Island of Islay, Scotland |
| 1944 | Unswerving (P63) | HMS Unswerving sinks a Greek sailing vessel with gunfire off Crete. |
| The Dolphin Code | Read |
| The Dolphin Code has earned a solid international reputation, and is now well known within Western Submarine navies. It has even been rumoured that the late Soviet Naval Air Force used the code on occasion. The Royal Australian Navy additions were added in 1997 and serve to attest to the popularity of the DOLPHIN CODE | |
Joel C.E. Blamey
The Memoirs of a Submarine Engineer in Peace and War
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