| Navy | The Royal Navy |
| Type | Rescue Tug |
| Class | Assurance |
| Pennant | W 18 |
| Built by | Cochrane & Sons Shipbuilders Ltd. (Selby, U.K.) |
| Ordered | |
| Laid down | 27 Dec 1939 |
| Launched | 22 Jun 1940 |
| Commissioned | 19 Oct 1940 |
| End service | |
| History | Renamed Tenacity in November 1940. Renamed Adherent in 1947. Sold into mercantile cervice in 1960 being renamed Hermes. |
We don't have any commands listed for HMS Diligent (W 18)
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Notable events involving Diligent include:
16 Jan 1941
HMS Westcott (Lt.Cdr. W.F.R. Segrave, RN), HMRT Superman and HMRT Tenacity together pick up 143 survivors from the British passenger ship Oropasa that was torpedoed and sunk by German U-boat U-96 southeast of Rockall in position 56°28'N, 12°00'W.