Former
prosecutor Ray Breslin is the founder and co-owner of Breslin-Clark, a security firm specializing in testing the security measures of
supermax prisons. Posing as an inmate to study facilities from within and exploit their weaknesses to escape, Breslin is driven by the murders of his wife and child by an escaped convict he had successfully prosecuted, and has garnered a reputation as the man who can
escape any prison. Breslin and his business partner, Lester Clark, receive a multimillion-dollar deal from
CIA operative Jessica Miller to test a new,
top secret prison for
disappeared persons on the condition that Ray and his team cannot know the prison's true location. Although this violates his principles, Breslin agrees. In
New Orleans, Breslin allows himself to be captured, pretending to be a
mercenary and posing under the alias Anthony Portos. Unexpectedly, the plan goes awry when his captors remove a tracking microchip implanted in his arm by Miller and drug him, preventing his colleagues from knowing where he has been taken. During the flight, he witnesses a mercenary named Drake kill another captive. Breslin wakes up inside the prison and realizes that the
warden, Willard Hobbes, is not the same warden who was supposed to release him in an emergency, rendering the secret evacuation code that Jessica gave him useless. He discovers that the prison cells have fully transparent walls and tend to rotate around various blocks, and that the guards surveilling the cells are clad in fully black masks and robes. He befriends another inmate, Emil Rottmayer, who claims to be a security expert for Victor Mannheim, a faceless
Robin Hood-type figure who steals from the wealthy. Staging an escape attempt, Breslin discovers he is aboard a massive
prison ship under the guise of an oil tanker somewhere in the middle of an ocean. Having been informed by Clark of Breslin’s job as a prison security tester, Hobbes reveals to Breslin that he is aware of his
true identity and will ensure Breslin spends the rest of his life in the prison (as requested by Clark, who intended to take over the joint business by getting rid of Breslin). Hobbes also notes that Breslin's book was the ideal blueprint for constructing the prison. Breslin offers Hobbes information on Mannheim in exchange for his release, to which Hobbes agrees. While Breslin feeds Hobbes false information about Mannheim, his colleagues, Abigail Ross and Hush, grow suspicious of Clark when Breslin's paycheck for the job is frozen. Hush discovers that the prison, codenamed "The Tomb," is owned by a for-profit organization linked to a notorious
private security contractor. Clark is also revealed to be in direct contact with Hobbes about Breslin's imprisonment. With help of an DIY-
sextant and another inmate named Javed who sneaks outside to secretly measure the ship’s latitude, Breslin and Rottmayer deduce they are somewhere in the
Atlantic Ocean near
Morocco. Breslin convinces the Tomb physician, Dr. Kyrie, to send a request for support from Mannheim’s associates and relay them the ship’s coordinates. Shortly after, Breslin, Rottmeyer and Javed stage a rebellion in their sector, overpower the guards and sneak out of the prison into the interior facilities of the ship. In the second escape attempt, Breslin kills Drake when he tries to intercept them, but the already wounded Javed, who was buying time for Rottmayer and Breslin to escape, is gunned down by Hobbes and his men. A helicopter sent by Mannheim’s associates arrives at the ship and engages in a gunfight with the guards. Rottmayer kills the guards on the deck and boards the helicopter, waiting for Breslin. Meanwhile, Breslin, who remained inside the ship to cut off the power supply, hides in the ship’s
septic tank and is flushed to the bottom of the ship when Hobbes’s men unintentionally
depressurize the tank. Reaching the helicopter as Hobbes fires at him, Breslin climbs the hanging ladder and shoots several leaking oil barrels, killing Hobbes in the explosion. The helicopter lands on a Moroccan beach, where Rottmayer reveals he is actually Mannheim himself and "Jessica Miller" is in fact his daughter, who hired Breslin to mastermind her father's escape. As punishment for his betrayal, Lester Clark is captured by Mannheim’s men, locked in a shipping container and sent off to an unknown location. ==Cast==