Sector 7: On an oil rig platform, located south of Jeju Island, Hae-Joon (Ha Ji-Won) works as the equipment manager for a small, but dedicated crew. Joining the crew is Jung-Man (Ahn Sung-Ki), a former colleague of Hae-Joon�s late father, and now newly assigned captain of the platform's underwater exploratory ship "Eclipse." Though his job is to oversee the withdrawal of the platform, Jung-Man suggests conducting one last drilling.