On November 20, 1998, a North Korean vessel was detected and captured off the waters of the Kangwha Island in an attempt to infiltrate spies, who subsequently escaped to the North. On December 17, 1998, one semi-submersible under control of the Nampo Liaison Office was sunk by the ROK Navy while trying to infiltrate the coast near Yosu. The infiltration was detected by night surveillance equipment of our guard units prior to the infiltration, and a navy¡©air force joint operation sank the semi-submersible about 56 miles south of Yokji-do while it was making its way back to the North in the early morning of December 18.

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