While under heavily armed guard, the dangerous convicts aboard a cargo ship unite in a coordinated escape attempt that soon escalates into a bloody, all-out riot. But as the fugitives continue their brutal campaign of terror, they soon discover that not even the most vicious among them is safe from the horror they unknowingly unleashed from the darkness below deck. Follows dangerous criminals on a cargo ship who are transported from the Philippines to South Korea, as they unleash a sinister force after an escape attempt leads to a riot.