In August 1961, East German authorities began sealing off West Berlin with railway cars and barbed wire, a barrier that hardened over the following decades into concrete walls, guard towers, and death strips. This HISTORY production uses computer imagery to reconstruct how that structure grew from a hasty barricade into one of the most heavily fortified borders in the world, while archival footage and interviews trace the human cost behind the engineering. The film follows escape attempts, from tunnels dug under the death strip to homemade gliders and vehicles rigged to smash through checkpoints, some successful, many fatal. The Stasi's surveillance apparatus gets its own treatment, showing how East Germany policed its own citizens as tightly as it policed the border. The narrative closes with the political unraveling of 1989, when crowds breached the checkpoints and began tearing the wall down by hand. It is a straightforward, well-sourced account of a barrier that defined the Cold War for twenty-eight years.