Ev, her husband Harold, and their friend Martin go scuba diving while on vacation in Puerto Rico. When they surface, they find that everyone on the island has died.Ev, her husband Harold, and their friend Martin go scuba diving while on vacation in Puerto Rico. When they surface, they find that everyone on the island has died.Ev, her husband Harold, and their friend Martin go scuba diving while on vacation in Puerto Rico. When they surface, they find that everyone on the island has died.