Tina and Ben are a couple of young youtubers specialized in underwater
exploration videos. While diving in a remote 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. "