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Captain Maria Sanchez and Dr. Robert Sullivan lead a daring expedition aboard the research sub Pacifica to uncover the deepest ocean secrets. Among their breathtaking finds ancient stone ruins, hinting at a long-lost civilization. But before they can investigate, a mammoth lurking vessel destroys parts of the ruins, sending the terrified crew fleeing.
Analysis of the ruins shakes scientists, believing they belong to extraterrestrials. Undaunted, Pacifica returns-only to be ambushed by strange mechanical beasts in a desperate battle for survival. Through close calls and close encounters, the crew begins piecing together clues that this advanced race' sophisticated astronomy led to their demise. Yet their discoveries attract a sinister presence determined to guard these ruinsn at all costs. When Pacifica unleashes energy pulses, lethal sentinels emerge from the abyss to ravage both crew and ruins.
As the crew risks everything to lift the veil on humanity's aquatic origins, they realize a shadowy intelligence is watching-and willing to destroy all who trespass on its ancient domain. An intelligence that now stirs the ocean's deepest depths.
