Two sisters on vacation in Mexico take a shark-cage dive that turns into a nightmare when the cable snaps, plunging them 47 meters into the ocean. With limited oxygen, circling sharks, and no easy escape, 47 Meters Down delivers tense underwater survival, claustrophobic suspense, and shark-driven terror in equal measure.

Från IMDB:
Two sisters vacationing in Mexico are trapped in a shark cage at the bottom of the ocean. With less than an hour of oxygen left and great white sharks circling nearby, they must fight to survive.