A group of mercenaries, along with two hostages, are fleeing through an open field from an unknown enemy. As they traverse the hostile terrain, they come across an armored tank. Out of desperation, they decide to take refuge inside the tank, hoping it will provide temporary safety from their relentless pursuers. The confined environment begins to take a toll on the group's mental stability as old tensions resurface and paranoia sets in. To make matters worse, mysterious substances and strange artifacts found inside the tank exacerbate their fears and distrust.

As the mercenaries struggle to stay calm and formulate an escape plan, the lines between reality and hallucination blur. Each member of the group wrestles with their own psychological demons, leading to increasingly erratic behavior. With no clear way out and the terror outside mounting, their chances of survival dwindle. The pressure cooker environment forces them to confront their deepest fears and secrets, all while trying to maintain some semblance of order within the metal confines. Ultimately, they must band together or risk being consumed by the darkness both outside and within the tank.