Events
On This Day - February 09
| 1915 | H10 | Laid Down |
| 1942 | Unison (P43) | Completed |
| 1943 | Unbending (P37) | HMS Unbending sinks Italian minelayer Eritrea east of Monopoli, Italy |
| 1945 | Venturer (P68) | HMS Venturer, commanded by James S Launders, torpedoed and sank the U-864 (all hands lost) in the North Sea west of Bergen, Norway. This is the only known incident in all of naval warfare in which one submarine sinks another while both are submerged |
| 1954 | Sidon (P259) | Taken in hand for refit at Cammell Laird, Birkenhead. Completed November 1954. |