A group of friends — Luke, Kate, Matt, Suzie, and Warren — set out on a sailing trip along the Great Barrier Reef. Their relaxing journey turns into a nightmare when their boat capsizes after hitting a submerged reef.

With no radio signal and the boat slowly sinking, most of the group decide to swim to a nearby island — except for Warren, who believes it’s too dangerous. As they swim through shark-infested waters, a great white shark begins stalking them.

One by one, the group members are picked off in chilling fashion, as the line between survival and death becomes increasingly thin.