Jun and Tae-hyun, best friends from childhood are Ship Salvation Unit (SSU) Officers of the Korean Navy. They are exact opposites. Jun is a rebellious former national diving champion and Tae-hyun is a perfect officer. Lieutenant Soo-jin completes this triangle of friends. They face the greatest challenge of their lives when they are called to rescue a submarine that has sunk to an extremely perilous depth of 187 meters, a rescue mission that tests their courage and frie...more

Jun and Tae-hyun, best friends from childhood are Ship Salvation Unit (SSU) Officers of the Korean Navy. They are exact opposites. Jun is a rebellious former national diving champion and Tae-hyun is a perfect officer. Lieutenant Soo-jin completes this triangle of friends. They face the greatest challenge of their lives when they are called to rescue a submarine that has sunk to an extremely perilous depth of 187 meters, a rescue mission that tests their courage and friendship deep in the ocean blue.
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