| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | Algerine |
| Pennant | J 275 |
| Mod | Reciprocating engined |
| Built by | Lobnitz & Co. Ltd. (Renfrew, Scotland) |
| Ordered | 25 Jun 1941 |
| Laid down | 31 Jan 1942 |
| Launched | 29 Sep 1942 |
| Commissioned | 12 Feb 1943 |
| End service | |
| History | HMS Hydra (T/A/Lt.Cdr. Charles Thomas Jegon Wellard, RNR) was mined off Ostend, Belgium on 10 November 1944. |
Commands listed for HMS Hydra (J 275)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Harry Whittaker Brammall, DSO, DSC, RNR | 11 Jan 1943 | 27 Oct 1943 |
| 2 | T/A/Lt.Cdr. Charles Thomas Jegon Wellard, RNR | 27 Oct 1943 | late 1944 |
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