| Navy | The Royal Navy |
| Type | Submarine |
| Class | U |
| Pennant | P 42 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | 23 Aug 1940 |
| Laid down | 30 Dec 1940 |
| Launched | 4 Nov 1941 |
| Commissioned | 29 Jan 1942 |
| End service | |
| History | HMS Unbroken was transferred on loan to the Soviet Union on 26 June 1944. Renamed V-2 by the Soviets. Returned in 1949 and scrapped at Gateshead on 9 May 1950. |
| Career notes | Became the Soviet submarine V-2 |
Commands listed for HMS Unbroken (P 42)
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| Commander | From | To | |
| 1 | Lt. Alastair Campbell Gillespie Mars, RN | 18 Nov 1941 | 12 Apr 1943 |
| 2 | Lt. Bruce John Bevis Andrew, DSC, RN | 14 Apr 1943 | 8 Jan 1944 |
| 3 | Lt. Peter Langley Langley-Smith, RN | 8 Jan 1944 | 26 Jun 1944 |
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Noteable events involving Unbroken include:
26 Apr 1942
HMS Unbroken (Lt. A.C.G. Mars, RN) damaged the Italian sailing vessel Vale Formoso II with gunfire off Bordighera, Liguria, Italy.
1 May 1942
HMS Unbroken (Lt. A.C.G. Mars, RN) fires her last two torpedoes at German U-boat U-74 (Oblt. K. Friedrich) about 30 nautical miles southeast of Almeria, Spain. Both torpedoes missed their target. (see map)
8 Aug 1942
HMS Unbroken (Lt. A.C.G. Mars, RN) fires two torpedoes at the Italian merchant Algerino (1370 GRT) off Capri. Both torpedoed missed their target.
13 Aug 1942
HMS Unbroken (Lt. A.C.G. Mars, RN) torpedoed and damaged the Italian heavy cruiser Bolzano and the Italian light cruiser Muzio Attendolo in the Ionian Sea off the north coast of Sicily in position 38°43'N, 14°57'E. (see map)
19 Oct 1942
HMS Unbroken (Lt. A.C.G. Mars, RN) torpedoed and damaged the Italian merchant Titania (5397 GRT) north-west of Tripoi, Libya in position 34°45'N 12°31'E. The Titania is taken in tow by the Italian destroyer Ascari. The Titania is sunk early the next day by HMS Safari (Cdr. B. Bryant, DSC, RN) east of Tunisia in position 34°45'N, 12°31'E. (see map)
19 Jan 1943
HMS Unbroken (Lt. A.C.G. Mars, DSO, RN) torpedoed and sank the Italian merchant Edda (6107 GRT) near Gerba, Tunisia in position 33°45'N, 11°12'E.
3 Apr 1943
HMS Unbroken (Lt. A.C.G. Mars, DSO, RN) attacked the German destroyer Hermes with torpedoes about 20 nautical miles south of Cape Saprtivento in position 37°46'N, 15°38'E. Unfortunately the torpedoes miss the target. (see map)
4 Apr 1943
HMS Unbroken (Lt. A.C.G. Mars, DSO, RN) torpedoed and damaged the German (former Norwegian) tanker Regina (9545 GRT) off Punta Stilo, Sicily, Italy in position 38°15'N, 16°30'E. (see map)
22 Apr 1943
HMS Unbroken (Lt. B.J.B. Andrew, DSC, RN) torpedoed and sank the Italian auxiliary minesweeper No. 17/Milano (379 GRT) off Cape San Vito, Sicily, Italy in position 38°11'N, 12°45'E. (see map)
19 May 1943
HMS Unbroken (Lt. B.J.B. Andrew, DSC, RN) torpedoed and sank the Italian pilot vessel F 20 / Enrica (269 GRT) 3 nautical miles bearing 260° off Pizzo Calabro in position 38°45'N, 16°00'E. (see map)
21 May 1943
HMS Unbroken (Lt. B.J.B. Andrew, DSC, RN) torpedoed and sank the Italian merchant Bologna (5439 GRT, former French Monaco) 8 nautical miles bearing 210 of Capo Vaticano in position 38°30'N, 16°00'E. (see map)