As a group of dangerous convicts are transported under heavily armed guard aboard a cargo ship, they band together in a meticulously planned escape attempt. However, the situation quickly escalates into a violent, full-scale riot. As the escapees unleash a campaign of terror, they soon realize that even the most ruthless among them are not immune to the terror that lurks below deck, a horror that they had unknowingly unleashed." This statement describes a situation where a group of convicts attempts an escape while being transported aboard a cargo ship, but things take a turn for the worse as the situation escalates into a violent riot. The convicts also learn that there is a greater horror lurking below deck which they had unleashed unknowingly and they are not safe from it
