Journalist Sara joins timid Victor and pregnant wife Thais, instructors Ivan and Edgar, and local kid Drui in Senegal for some underwater exploration. When their craft blows up following a misfired bullet, they float around in the water for a while before seeing a ship. Their initial relief turns to horror as they see a man being tipped into the water from it but the ship is the group's only option. Hiding on board, things start to unravel for them in a horrific way.