Sector 7 / 7 gwanggu (2011)

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.