The KSS-III submarine, also classified as the Dosan Ahn Changho-class submarines - is a series of diesel-electric attack submarines currently being built for the Republic of Korea Navy (ROKN), jointly by Daewoo Shipbuilding & Marine Engineering (DSME) and Hyundai Heavy Industries (HHI). The KSS-III is the final phase of the Korean Attack Submarine program, a three-phased program to build 27 attack submarines for the ROKN, between 1994–2029.
The KSS-III initiative consists of the development of nine diesel-electric attack submarines, capable of firing submarine-launched ballistic missiles (SLBM), to be built in three batches.