In January of 1962, 29 East Berliners escaped to West Berlin via a tunnel they had dug beneath the Berlin Wall, led by Erwin Becker, a chauffeur in the car pool of the East Germany Parliament, who served as technical adviser on this film. The film opens with Karl Schroeder (Don Murray), chauffeur to an East German Major, seeing a friend killed as he tried to drive his truck thr......