Attack Submarines (Diesel-Electric)
Hai Lung class LOA 220′ / 67.1 m TDISP 2,660 tons submerged (2 active, service since 1987) modified version of the Dutch Zwaardis class.
Hai Shih class LOA 312′ / 95.1 m TDISP 2,410 tons submerged. WW2 USN submarines of the Balao and Tench classes (USN service 1945 or 1946-1973), updated through GUPPY II program. (service since 1973). ROCS Hai Shih SS-791 (1973) formerly Tench class USS Cutlass SS-478 (1945-1973). A 2017 refit has meant this is likely the longest actively serving submarine in history. ROCS Hai Pao SS-792 (1973) formerly Balao class USS Tusk SS-426 (1946-1973). Both boats were transferred with torpedo tubes deactivated, but reportedly this was reversed.