| Navy | The Royal Navy |
| Type | Submarine |
| Class | U |
| Pennant | P 51 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | 23 Aug 1940 |
| Laid down | 30 Jul 1941 |
| Launched | 16 Apr 1942 |
| Commissioned | 2 Jul 1942 |
| End service | |
| Loss position | |
| History | Scrapped at Hayle in September 1949. |
Commands listed for HMS Unseen (P 51)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Lt. Michael Lindsay Coulton Crawford, DSC, RN | Jun 1942 | ??? | |
| 2 | T/Lt. Terence Douglas Wood, DSC, RNVR | 16 Apr 1944 | 5 Feb 1945 | |
| 3 | Lt. John Arthur Cross, RCNVR | 5 Feb 1945 | 15 Sep 1945 | |
| 4 | Lt. Ian Macfarlane Stoop, DSC, RN | 15 Sep 1945 | Oct 1945 ? | |
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Noteable events involving Unseen include:
16 Jan 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) torpedoes and sinks the italian merchant Zenobia Martini (1454 GRT) north of Gerba Island, Tunisia in position 33º56'N, 11º06'E. (see map)
18 Jan 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) torpedoes and sinks the Italian naval auxiliary Sportivo (1598 GRT) 5 nautical miles bearing 20 of Zuara, Libya in position 33º00'N, 12º08'E. (see map)
4 Feb 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) torpedoes and sinks the Italian merchant Le Tre Marie (1086 GRT) about 6 nautical miles south of Punta Alice, Italy in position 39º16'N, 17º11'E. (see map)
4 Mar 1943
While patrolling off Soussa, Tunisia HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) destroys the wreck of the German merchant Macedonia (2875 GRT) and a salvage barge.
24 Mar 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) fires four torpedoes against the Italian merchant Saluzzo (3747 GRT, former French Tamara) about 30 nautical miles west-south-west of Isola Marettimo, Italy in position 37º52'N, 11º27'E. All torpedoes fired however missed their target. (see map)
18 Apr 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC, RN) torpedoes and sinks the German auxiliary submarine chaser UJ-2205 (1168 GRT, former French Le Jacques Coeur) north-north-west of Isola di Femmine, Sicily, Italy in position 38º15'N, 13º13'E. (see map)
4 Aug 1943
While on patrol off Cape Rizzuto, Calabria, Italy, HMS Unseen (Lt. M.L.C. Crawford, DSC and Bar, RN) fires four torpedoes against what is identified as an Italian Regolo-class light cruiser. All torpedoes fired however missed their target.
27 Aug 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC and Bar, RN) torpedoes and sinks the Italian merchant Rastello (1550 GRT, former Greek Messaryas Nomikos) 48 nautical miles bearing 338 of Brindisi, Italy in position 41º30'N, 16º38'E. (see map)
28 Aug 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC and Bar, RN) sinks the Italian sailing vessel Fabiola (103 GRT) with gunfire and scuttling charges 3 nautical miles bearing 250 of Saseno Island, Albania.
21 Sep 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC and Bar, RN) torpedoes and sinks the German minelayer Brandenburg (3895 GRT, former French Kita) and the German nightfighter direction vessel Kreta (2600 GRT, former French Ile de Beauté) about 7 nautical miles north-east of Isola di Capraia, Italy in position 43º08'N, 09º58'E. (see map)
22 Oct 1943
HMS Unseen (Lt. M.L.C. Crawford, DSC and Bar, RN) torpedoes and sinks the German barge F 541 (155 GRT) off Imperia, Liguria, Italy.