Events
On This Day - October 28
| 1916 | Platypus (I 56) 1916 - 1957 | Launched |
| 1918 | G 2 (I A4) | Sank the German U-boat U78 |
| 1939 | Seal (N 37) | HMS Seal then departed Portsmouth for her 3rd war patrol. She was ordered to patrol in the North Sea near the Doggerbank. |
| 1939 | Sealion (N 72) | Left Portsmouth on her first war patrol in the North Sea. |
| 1941 | Thrasher (N 37) | HMS Thrasher sinks the Italian sailing vessel Esperia with gunfire north-east of Benghazi, Libya. |
| 1943 | Veto (P 88) | Laid Down |
| 1949 | Spark (P 236) | Sold to be scrapped at Faslane |
| 1949 | Surf (P 239) | Sold to be scrapped at Faslane |
| 1962 | Opportune (S 20) | Laid Down |
