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Construction on a luxury beach resort unearths ancient bones and pirate relics. A group of frat guys partying on the beach disturb a sunken grave with their drunken antics. That night, one of them vanishes. Then another. A ghostly mermaid with barnacle-covered skin, torn fins, and broken jewelry begins stalking them from the ocean, luring them with singing before killing them in brutal, symbolic ways-slashing, drowning, dismemberment.