47 Meters Down (2017)

Trapped in a shark observation cage at the bottom of the ocean during their Mexican vacation, two sisters find themselves in a race against time. With oxygen levels decreasing rapidly and hungry great whites lurking in the vicinity, they must come up with a plan to reach the surface before it's too late. As the minutes tick by, panic sets in and desperation takes hold. Will they be able to outsmart the predators and make it back to safety in time? Only time will tell.