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From the liner notes

When a tropical storm forces an offshore drilling company to evacuate non–essential personnel from the "Charlie" oil rig, the small but experienced crew left behind settles in to ride out the storm. Isolated on the rig, their routine night is interrupted when a crew member goes missing and an extensive search proves futile. Slowly, they discover that a deadly creature is stalking the crew, eliminating them one by one. Surrounded by nothing but raging ocean with no hope of escape, the roughnecks must survive the stormy night with an unrelenting force of death hunting them down.