Hai Lung-class

The Chien Lung class, also designated the Hai Lung class, consists of two diesel-electric attack submarines operated by the Republic of China Navy. Ordered from the Dutch builder Wilton-Fijenoord in September 1981, the design is a modified version of the Netherlands' Zwaardvis class, which was based on the United States Barbel-class teardrop hull. Construction began in 1982, though financial instability at the shipyard delayed progress until 1983. The class comprises two vessels: Hai Lung (SS-793) and Hai Hu (SS-794). While the Republic of China sought to purchase additional units in 1983 and 1992, the Dutch government declined further orders following diplomatic pressure from China.

The design incorporates a teardrop hull and utilizes a false deck with spring suspension for noise-producing machinery to facilitate silent running. Electronic systems include the Elbit TIMNEX 4CH(V2) electronic support measures system. For armament, the class originally utilized AEG SUT 264 wire-guided torpedoes. A capability enhancement initiated in 2008 integrated the UGM-84 Harpoon Block II anti-ship missile, with deliveries taking place between 2013 and 2016. This integration allows for the engagement of both maritime and land-based targets.

Hai Hu was commissioned in October 1987, and Hai Lung followed in April 1988. The primary operational roles of the class include the protection of sea lanes and the deterrence of naval blockades. In 2018, a modernization program was authorized to extend the service life of the vessels into the late 2030s. This project, overseen by RH Marine, includes upgrades to the combat systems, electronic warfare suites, hull, and mechanical systems. The submarines are also being equipped with Mark 48 heavy torpedoes as part of this modernization. The Hai Lung class is scheduled to be replaced by the Hai Kun-class submarines currently under development through the Indigenous Defense Submarine program.