47 Meters Down

Two sisters on vacation in Mexico are trapped in a shark observation cage at the bottom of the ocean, with oxygen running low and great whites circling nearby, they have less than an hour of air left to figure out how to get to the surface. Lisa (Mandy Moore) and Kate (Claire Holt), who are on their way back from a recent breakup, must use their wits and whatever resources they can find to escape, with Captain Taylor's (Matthew Modine) warnings that one of his men will come down to rescue them but Javier is killed by a shark. As the sisters' situation becomes increasingly dire, Lisa begins to hallucinate due to nitrogen narcosis, leading her to mistake Kate as being still alive and trapped with her.