STARRING: Ryu Su Young, Shin Hyun Jun, Shin Eun Kyung
SYNOPSIS: TaeHyun and SooJin are all Ship Salvation Unit (SSU) Officers of the Korean Navy. Jun is a rebellious former national diving champion and his best friend TaeHyun, is a perfect officer. Lieutenant SooJin completes this triangle. They face the greatest challenge of their lives, when they are called to rescue a submarine, which after a drill accident has sunk to an extremely perilous depth of 300 meters.
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