Two sisters are exploring the deep blue sea until something goes wrong. As they submerge 47m they encounter a creature that only wants flesh and blood. As they fight their way back to the top, they shortly run out of oxygen. With only an hour left they're not only racing against time they are racing against life and death.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.