| Navy | The Royal Navy |
| Type | MS Whaler |
| Class | [No specific class] |
| Pennant | FY 1700 |
| Built by | Smiths Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 8 Jul 1929 |
| Commissioned | Mar 1940 |
| End service | |
| History | Whaler of South Georgia Co. Ltd. (Chr.Salvesen & Co., Middlesborough, U.K.), taken over by the Admiralty in March 1940. Returned to owner in April 1946. |
Commands listed for HMS Sirra (FY 1700)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Ch.Skr. Arthur Pitchers, RNR | 2 Oct 1940 | 13 Feb 1941 |
| 2 | T/Lt. Richard Lawrence Hippisley, RNVR | 13 Feb 1941 | 31 Jan 1944 |
| 3 | T/Skr. Harry Chamberlain, RNR | 31 Jan 1944 | 13 Apr 1944 |
| 4 | Skr. Martin Freeman Kent McWilliam, RNR | 13 Apr 1944 | mid 1945 |
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