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On This Day - May 28
| 1909 | C 25 (I 55) | Completed |
| 1909 | C 26 (I 56) | Completed |
| 1916 | E 18 (I 98) | E18 was sighted by a German naval aircraft off Memel during the morning, E18 dives. |
| 1916 | L 7 | Laid Down |
| 1916 | L 8 | Laid Down |
| 1940 | Seal (N 37) | The Swedish merchant Torsten hits a mine and sinks. The mine was laid by the British submarine HMS Seal in the Kattegat on 4 May 1940. |
| 1945 | Trump (P 333) | HMS Trump sinks a Japanese coaster with gunfire off the Sapudi Strait. |
| 1962 | Onyx (S 21) | HMS Onyx ordered from HM Dockyard Chatham |
