Events
On This Day - July 31
| 1916 | J6 | Completed |
| 1942 | Traveller (N48) | While operating in the Adriatic HMS Traveller fires 6 torpedoes at the Italian gunboat Cattaro. The torpedoes however missed their target. |
| 1943 | Unsparing (P55) | HMS Unsparing torpedoes and sinks the Italian tanker Flegetonte off Bari, Italy. |
| 1943 | Terrapin (P323) | Launched |
| 1943 | O24 (Dutch) | Shelled in error by the American merchant Point Clear South of Ceylon. No damage was sustained. |
| 1945 | XE3 | XE-3 made a successful attack on a Japanese heavy cruiser of the Atago class at her moorings in Johore Strait, Singapore, on 31st July, 1945 for which a VC was awarded. Leading Seaman Magennis served as Diver in XE-3 during the same attack and was also awarded the VC. |
| 1945 | Tiptoe (P332) | HMS Tiptoe damages a Japanese coaster with gunfire off the Sunda Strait. |
| 1946 | Aeneas (P427) | Completed |
