Through the first phase, KSS-I, the ROK Navy acquired nine 1,200-ton . For the second phase, KSS-II, the ROK Navy planned to acquire nine 1,800-ton "Sohn Wonyil"-class submarines with Air-Independent propulsion (AIP) system; the lead boat of her class, ROKS "Sohn Wonyil" (SS 072) was launched at a shipyard of Hyundai Heavy Industries on June 9, 2006. The Type 214 submarine is expected to play a key role in safeguarding the country's maritime interests. For the third phase of the program, the lead boat of KSS-III, the "Dosan Ahn Changho" (SS 083) was launched in 2018. A total of nine 3,000-ton KSS-III submarines are expected to be built in South Korea with indigenous technologies (i.e. not going under license as the previous KSS-I and KSS-II submarines).