"Here be monsters"—this phrase has long been used to describe the ocean, a dark, impenetrable realm that can only hide unimaginable horrors from human sight... often until it is too late. A series of unexplained accidents occur at a submarine platform located 6,000 meters below the surface, prompting a team of scientists and cadres to be dispatched for an investigation. Soon, the group begins to be tormented by terrifying, elusive visions... and the streak of brutal deaths resumes. Is it merely a string of freak accidents and hallucinations driven by sheer paranoia, the claustrophobic setting, and dysbarism... or is there truly something else lurking within this abyssal station?