S. Korea's domestically designed and built 3,000-ton Dosan Ahn Chang-ho submarine has successfully crossed the Pacific Ocean, the longest voyage.

S. Korea's domestically designed and built 3,000-ton Dosan Ahn Chang-ho submarine has successfully crossed the Pacific Ocean, the longest voyage.

S. Korea is preparing to publicly unveil a development roadmap for a nuclear-powered attack submarine program after the successful Pacific deployment.