Tina (Camille Rowe) and Ben (James Jagger) are a couple of young youtubers specialized in underwater exploration videos. While diving in a remote French lake, they discover a house submerged in deep waters. What was initially a unique finding soon turns into a nightmare when they understand the house was the scene of atrocious crimes. Trapped, with their oxygen reserves falling dangerously, Tina and Ben realize the worst is yet to come: they are not alone in the house.
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