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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| В-2 [V-2] (ex-Unbroken, ex-P42) | 797 | Vickers-Armstrong, Barrow, UK | 12.1940 | 4.11.1941 | 1/1942 // 5.1944 | to UK 2.1949 (Unbroken) | |
| В-3 [V-3] (ex-Unison, ex-P43) | 798 | Vickers-Armstrong, Barrow, UK | 12.1940 | 5.11.1941 | 2/1942 // 5.1944 | to UK spring 1950 |
| Displacement standard, t | 540 |
|---|---|
| Displacement normal, t | 646/732 |
| Length, m | 60.0 |
| Breadth, m | 4.90 |
| Draught, m | 4.65 |
| No of shafts | 2 |
| Machinery | 2 Paxman-Ricardo diesel-generators/ 2 electric motors |
| Power, h. p. | 615 / 825 |
| Max speed, kts | 11.25 / 10 |
| Fuel, t | diesel oil 55 |
| Endurance, nm(kts) | 4050(10) / |
| Armament | 1 x 1 - 76/45 20cwt QF Mk II, 4 - 533 TT (bow, 8 or 6 mines) |
| Electronic equipment | type 291W radar, type 129, type 138 sonars |
| Complement | 33 |
| Diving depth operational, m | 60 |
Former British submarines of U class, transferred to USSR on account of reparations from Italy.
None.
No significant events.

