Searching out more hallways, more turns, Navidson eventually leads the way down a narrow corridor ending with a door. Navidson and Reston open it only to discover another corridor ending with another door. Slowly they make their way through a gauntlet of what must be close to fifty doors (it is impossible to calculate the exact number due to the jump cuts), until Navidson discovers for the first and only time a door without a door knob. Even stranger, as he tries to push the door open, he discovers it is locked. Reston's expression communicates nothing but incredulity. [89]