Events
On This Day - August 13
| 1908 | C17 | Launched |
| 1910 | C33 | Completed |
| 1942 | Unbroken (P42) | HMS Unbroken torpedoes and damages the Italian heavy cruiser Bolzano and the Italian light cruiser Muzio Attendolo in the Ionian Sea off the north coast of Sicily. |
| 1942 | United (P44) | HMS United torpedoes and sinks the Italian transport ship Rosolino Pilo 50 nautical miles off Pantellaria. |
| 1943 | Vortex (P87) | Laid Down |
| 1945 | Anchorite (P422) | Laid Down |
| 1945 | Andrew (P423) | Laid Down |
| 2015 | Artful (S121) | Left Barrow and put to sea for the first time |
