Events
On This Day - October 12
| 1914 | F3 | Laid Down |
| 1914 | G4 | Laid Down |
| 1914 | G5 | Laid Down |
| 1942 | Thrasher (N37) | HMS Thrasher sinks a Greek sailing vessel with gunfire in the Aegean Sea, about 15 nautical miles east of Cape Drepano, Sithonia peninsula, Greece. |
| 1942 | Simoom (P225) | Launched |
| 1942 | Ultor (P53) | Launched |
| 1944 | Strongbow (P235) | HMS Strongbow torpedoes and sinks the Japanese merchant cargo ship Manryo Maru in the Malacca Strait. |
| 1991 | Triumph (S93) | Completed |
| 2011 | Olympus (N35) | There was a fire inside the Olympus submarine at Port Maitland's Marine Recycling Corp. About 10 workers had to evacuate the vessel. To took firefighters 24 hours to put the fire out. |