Dosan Ahn Changho-class Submarine

The Dosan Ahn Changho-class submarines are the final phase of the Korean Attack Submarine program, a three-phased program to build 27 attack submarines for the Republic of Korea Navy between 1994 and 2029. The lead vessel ROKS Dosan Anh Changho was launched in 2018. It began sea trials in 2019 and will be ready for service by 2020.

This new class will have a submarine version of the Korean Vertical Launching System which will be able to carry up to ten indigenous "Chonryong" land-attack cruise missiles and "Hyunmoo" submarine-launched ballistic missiles, becoming the first submarine in the South Korean navy to have this kind of capability. It will also have many other improvements compared to its predecessors built with a greater degree of South Korean technology, especially in the later batches, which will include Samsung SDI lithium-ion batteries. Measured to weigh over 3800 tonnes submerged during sea trials, they are the largest conventional submarines ever built by South Korea. The Batch II vessels will increase their displacement by approximately 450 tonnes (4,250 tonnes submerged), according to the Defense Acquisition Program Administration.

The 2nd vessel of first batch was observed nearing completion in the Geoje shipyard of Daewoo Shipbuilding & Marine Engineering on May 12, 2019.

Batch One

 * ROKS Dosan Ahn Chang-ho (SS-083) - sea trials
 * ROKS Son Byong-hi (SS-085) - under construction
 * ROKS Yi Dongnyeong (SS-086) - under construction

Batch Two

 * ROKS Lee Bong-chang (SS-087) - planned for construction
 * ROKS Unnamed (SS-088) - planned for construction
 * ROKS Unnamed (SS-089) - planned for construction

Batch Three

 * ROKS Unnamed (SS-091) - planned for construction
 * ROKS Unnamed (SS-092) - planned for construction
 * ROKS Unnamed (SS-093) - planned for construction