In search of much-needed relaxation, Susan and Daniel decide to take a tropical island vacation. While on a scuba diving tour several miles off the coast, the couple is accidentally left stranded in the middle of the ocean. As time slowly ticks by, Susan and Daniel are terrified to discover they are not alone, but adrift in shark-infested waters. Now the couple must fight to stay afloat, keep warm, and somehow stay alive in this intense, critically acclaimed tale of survival against impossible odds.