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On This Day - May 5
| 1909 | C 22 (I 52) | Completed |
| 1909 | C 23 (I 53) | Completed |
| 1909 | C 24 (I54) | Completed |
| 1915 | V 1 | Completed |
| 1917 | P 512 | Laid Down |
| 1920 | P 552 | Commissioned |
| 1928 | Odin (N 84) | Launched |
| 1930 | Poseidon (N 99) | Completed |
| 1938 | Maidstone (F44) 1937 - 1978 | Submarine depot ship HMS Maidstone commissioned |
| 1938 | Maidstone (F44) 1937 - 1978 | Commissioned |
| 1939 | Triad (N 53) | Launched |
| 1939 | Truant (N 68) | Launched |
| 1940 | Seal (N 37) | The small Swedish fishing vessel GG 256 / Almy hits a mine and sinks. The mine was laid by the British submarine HMS Seal in the Kattegat on 4 May 1940. |
| 1943 | Tactician (P 314) | HMS Tactician sinks the Italian auxiliary patrol vessel V17/Pia with gunfire about 10 nautical miles west of Grosseto, Italy. |
| 1943 | Sea Devil (P 244) | Laid Down |
| 1944 | Unswerving (P 63) | HMS Unswerving sinks three sailing vessels with gunfire in the Gulf of Nauplia, Greece. |
| 1945 | Scythian (P 237) | HMS Scythian sinks a small Japanese vessel with gunfire in the Strait of Malacca. |
| 1945 | Statesman (P 246) | HMS Statesman sinks two Japanese sailing vessels with gunfire in the Strait of Malacca. |
| 1955 | Minnow (X 54) | Launched |
| 1962 | Ocelot (S 17) | Launched |
