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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| Ξιφίας [Xifias] (ex-Untiring, ex-Upstart, ex-P59) | Y10 | Vickers-Armstrong, Tyne, UK | 12.1941 | 20.1.1943 | 6/1943 // 7.1945 | to United Kingdom 5.1952 (Untiring) | |
| Αμφιτρίτη [Amfitriti] (ex-Upstart, ex-Untiring, ex-P65) | Y11 | Vickers-Armstrong, Barrow, UK | 3.1942 | 24.11.1942 | 4/1943 // 3.1945 | to United Kingdom 5.1952 (Upstart) |
| 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 or Paxman diesel-generators/ 2 electric motors |
| Power, h. p. | 615 / 825 |
| Max speed, kts | 11.25 / 10 |
| Fuel, t | diesel oil 38, later 55 |
| Endurance, nm(kts) | 4050(10) / |
| Armament | 1 х 1 - 76/45 20cwt QF Mk II, 4 - 533 TT (bow, 8 torpedoes or 6 M2 mines) |
| Electronic equipment | type 267QW radar, type 129, type 138 sonars |
| Complement | 33 |
| Diving depth operational, m | 60 |
British submarines of U class, transferred to Greece in 1945 after RN service.
None.
No significant events.

