Events
On This Day - April 25
| 1916 | E22 | HMS E22 was on surface passage in the North Sea. At just after 1150 a torpedo fired from the German submarine UB18 struck the vessel sending her immediately to the bottom. Of the crew of 33 only two survived having been picked up by U18 and taken as Prisoners of War. ERA F S Buckingham and Signalman W T Harrod. |
| 1918 | H23 | Completed |
| 1918 | R1 | Launched |
| 1918 | R2 | Launched |
| 1940 | Trident (N52) | HMS Trident fires two torpedoes against the German merchants Palime and Pelikan about 30 nautical miles south-west of Lindesnes, Norway. Both torpedoes missed. |
| 1941 | Upholder (N99) | HMS Upholder torpedoes and sinks the Italian Antonietta Lauro, near Kerkennah Buoy #3, Tunisia. |
| 1941 | P311 | Laid Down |
| 1945 | Sea Scout (P253) | HMS Sea Scout sinks a Japanese coaster with gunfire off Sumbawa Island, Netherlands East Indies. |
| 1956 | Porpoise (N14) | Launched |
| 1979 | Trafalgar (S107) | Laid Down |
