Title: Kwahak ŭi yangsim, Ch'ŏnanham ŭl ch'ujŏk hada
Subjects: Shipwrecks, Ch'ŏnanham (Ship), Investigations, Research, Maritime terrorism, Submarines (Ships), Military relations, Cheonan (Ship)
Places: Korea (South), Paengnyŏng Island
People: Sŭng-hŏn Yi (1963-)