Dosan Ahn Changho-class (KSS-III)

The Dosan Ahn Changho class represents the final phase of a long-term strategic initiative to establish an independent underwater combat capability. Developed as the third stage of a multi-decade attack submarine program, this class marks a transition from license-built designs to domestically engineered platforms. Design preparations commenced in 2007 to replace preceding classes with a larger, more versatile vessel. The program is structured into three distinct batches, with construction of the lead ship beginning in 2014 to meet evolving regional security requirements.

This platform is a diesel-electric attack submarine characterized by its integration of a vertical launching system for ballistic missiles. The hull is constructed from high-strength alloy steel to facilitate deep-submergence operations, while non-acoustic stealth is maintained through anechoic coatings and elastic mounts. Propulsion is provided by a diesel-electric system augmented by fuel-cell-based air-independent propulsion, allowing for extended submerged endurance. Later iterations incorporate lithium-ion battery technology to enhance underwater speed and durability. Its primary armament consists of submarine-launched ballistic missiles and heavyweight torpedoes, managed by an integrated combat suite and a comprehensive sonar array. It is the first air-independent propulsion vessel globally to possess ballistic missile launch capabilities.

Currently operated by the Republic of Korea Navy, the class entered active service in 2021. These vessels are utilized for long-range patrols and strategic deterrence, with several units now commissioned and active. Beyond domestic deployment, the design has been positioned for international procurement programs. It has been shortlisted for the Royal Canadian Navy’s replacement program and offered to meet the requirements of the Indian and Polish navies. The class is intended to remain a central component of maritime operations through the late 2020s as additional units are completed and deployed.