| 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 | |
| Loss position | |
| History | Renamed Tenacity in November 1940.
Renamed Adherent in 1947. Sold into mercantile cervice in 1960 being renamed Hermes. |
| Noteable events involving Diligent include: 16 Jan, 1941 |