| 1915 | J2 | Laid Down |
| 1941 | Usk (N65) | HMS Usk sailed from Malta for a patrol off the NW coast of Sicily on 19 April 1941. Anti-submarine activity was intense and Usk was ordered to alter her position. What happened to Usk is not known but she is most likely mined in the vicinity of Cape Bon some time after 25 April 1941. She was reported overdue on 3 May 1941 |
| 1941 | Triumph (N18) | HMS Triumph sinks the Italian auxilary patrol vessel V 136/Tugnin F. with gunfire about 10 nautical miles west of Marsa el Brega, Libya. |
| 1941 | P32 | Completed |
| 1942 | Unrivalled (P45) | Completed |
| 1943 | Upshot (P82) | Laid Down |
| 1944 | Tantalus (P318) | HMS Tantalus torpedoes and sinks the Japanese army cargo ship Amagi Maru about 40 nautical miles south of Port Blair, Andaman Islands. |
| 1944 | Unswerving (P63) | HMS Unswerving sinks two sailing vessels with gunfire in the Gulf of Nauplia, Greece. |
| 1945 | H6 | Scuttled in the harbour at Kiel whilst in German service as U-D1 |
| 2019 | King George VI (S129) | The First Sea Lord, Admiral Sir Philip Jones KCB ADC, announced King George VI as the name of the fourth in class submarine for the Dreadnought Programme. The name was announced this, ahead of a service at Westminster Abbey to mark the 50th year of Operation Relentless – which provides Continuous at Sea Deterrence (CASD).
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