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| Name | No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|
| 돌고래 051 [Tolgorae 051] | 051 | Hyundai, Ulsan | 2.4.1983 | 1.3.1985 | stricken 12.2003 | |
| 돌고래 052 [Tolgorae 052] | 052 | Hyundai, Ulsan | 15.12.1989 | 8.11.1990 | stricken 6.2016 | |
| 돌고래 053 [Tolgorae 053 | 053 | Hyundai, Ulsan | 30.8.1991 | 12.12.1991 | stricken 6.2016 |
| Displacement standard, t | |
|---|---|
| Displacement normal, t | 150 / 175 |
| Length, m | |
| Breadth, m | |
| Draught, m | |
| No of shafts | 1 |
| Machinery | 1 diesel-generator, 1 electric motor |
| Power, h. p. | |
| Max speed, kts | 9 / 6 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | |
| Armament | 2 - 533 TT (bow, 2) |
| Electronic equipment | STN Atlas sonar suite |
| Complement | 6 + 8 combat swimmers |
| Diving depth operational, m | 100? |
Reportedly the first was delivered in 1983, the second in 1988. May not be assigned to the ROKN proper. Photos show a broad hull, a bulbous bow sonar installation, and a small sail incorporating a folding snorkel mast. There is a single periscope. Are supported by the tender Dadohae (ASL 50).
None.
No significant events.

