Events
On This Day - June 20
| 1912 | Alecto (J10) 1911 - 1949 | Commissioned |
| 1915 | Talbot / Medway II 1951 - 1946 | Completed |
| 1940 | Parthian (N 75) | Scored the first hit in the Mediterranean when sinking the Italian submarine Diamante off Tobruk |
| 1940 | Salmon (N 65) | HMS Salmon fires two torpedoes against a German convoy about 15 nautical miles south-west of Egersund, Norway. Both torpedoes missed their intended targets. |
| 1940 | Clyde (N 12) | About 40 nautical miles north-west of the island of Halten, Norway. HMS Clyde hit the German battleship Gneisenau in the bow with one torpedo, putting her out of action for many months. Lt. Cdr. D. Ingram was awarded the DSC. for the action. |
| 1940 | Tigris (N 63) | Completed |
| 1943 | United (P 44) | HMS United torpedoes and sinks the Italian merchant Olbia about 20 nautical miles south of Cape Spartivento, Italy. |
| 1943 | Volatile (P 96) | Launched |
| 1944 | Storm (P 233) | HMS Storm attacks the German submarine U-1062 with torpedoes in the Malacca Strait. The torpedoes however miss their target. The u-boat had left Penang the previous day. |
| 1944 | Ultor (P 53) | HMS Ultor torpedoes and sinks the German tug Cebre south of Cannes, southern France. |
| 1944 | Urtica (P 83) | Completed |
