| 1901 | 1900 - 1922: Shearwater | Commissioned |
| 1942 | Unique (N95) | Lost cause unknown to the west of Gibraltar |
| 1942 | Taku (N38) | HMS Taku sinks a small Greek sailing vessel with gunfire west of Kos, Greece |
| 1942 | Upstart (P65) | Launched |
| 1958 | Rorqual (N74) | Completed |
| Triumph (N18) | |
| Built By: | Vickers (Barrow) |
| Build Group: | T Group 1 |
| Fate: | The boat was mined on or around 6th January 1942. She had earlier struck a mine in December 1940 but miraculously survived. There were no miracles the second time. |
| Built By: | Vickers (Barrow) | Build Group: | 2400 |
| Fate: | |
| Laid up 1995 then Lease/Sold to Canadians in 2000, became Chicotimi. Caught fire en route to Canada with the loss of one life | |
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