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| Name | No | Yard No | Builder | Laid down | Launched | Comm | Fate |
|---|---|---|---|---|---|---|---|
| Simpson (ex-Spot) | 21 | Mare Island N Yd, Vallejo, USA | 8.1943 | 19.5.1944 | 8.1944 // 23.1.1961 | stricken 1982 | |
| Thomson (ex-Springer) | 22 | Mare Island N Yd, Vallejo, USA | 10.1943 | 3.8.1944 | 10.1944 // 12.1.1962 | for spares 9.1972 |
| Displacement standard, t | |
|---|---|
| Displacement normal, t | 1845 / 2415 |
| Length, m | 92.2 wl 95.0 oa |
| Breadth, m | 8.31 |
| Draught, m | 4.65 |
| No of shafts | 2 |
| Machinery | 4 Fairbanks-Morse diesel-generators / 4 electric motors |
| Power, h. p. | 5400 / 2740 |
| Max speed, kts | 20.25 / 8.75 |
| Fuel, t | diesel oil 378 - 472 |
| Endurance, nm(kts) | 11000 (10) / 96 (2) |
| Armament | 1 x 1 - 127/25 Mk 40, 1 x 1 - 40/60 Mk 3, 10 - 533 TT (24 torpedoes or 40 mines, 6 bow, 4 stern) |
| Electronic equipment | SS, ST, SV radars, WFA, JT sonars, APR-1 ECM suite |
| Complement | 60 |
| Diving depth operational, m | 120 |
Former USN Balao class submarines.
1966, Thomson; 1977, Simpson: CT was streamlined; - 1 x 1 - 40/60
No significant events.

