Cheonghaejin-class submarine rescue ship

The "Cheonghaejin"-class ASR (Hangul: ; Hanja: ) is a submarine rescue ship class of the Republic of Korea Navy. Only one ship has been built in her class, ROKS "Cheonghaejin" (ASR 21), in 1995. Its operations include rescuing trapped sailors in submarines, naval operation support for submarines, underwater research and mapping support, and recovery of sunk vessels. It is equipped with a deep submergence rescue vehicle (DSRV) that operates up to , and a rescue chamber that holds up to nine people.
Once all nine "Son Wonil"-class submarines are delivered to the Republic of Korea Navy, another ASR ship of the same class is planned to be built.