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Something awaits 8,000 feet under the sea off the southern tip of Jeju Island.
The Eclipse is the offshore drilling rig stationed at Sector 7, a mining area in the vast open sea located off the southern tip of Jeju Island. The oil drilling excavations end in failure and headquarters gives the order to withdraw.
Captain Jeong-man is sent to oversee the crews withdrawal from the Eclipse. However, Hae-jun, the equipment manager (played by Ha Ji-won), is adamantly opposed to the headquarters order, as she is certain that oil will be discovered in Sector 7. Motivated by Hae-juns conviction of finding oil, the Captain suggests conducting one last drilling exercise.
While Hae-jun and the crew are fully engaged in their final attempt, they lose communication with headquarters, and the crew is overwhelmed by the disconcerting feeling that something is out there.
As bodies begin disappearing one by one, the few surviving need to think fast and fight for their lives in a non-stop battle against the mutant monster from the sea. Survival looks unlikely, but Hae-jun and the crew are determined to take any chance to get out of Sector 7 alive.