Eastwood insisted on doing all his own climbing and stunts—a decision met with disapproval by the director of the International School of Mountaineering, Dougal Haston, who experienced the dangers of the Eiger first-hand, having been with American climber John Harlin when he fell to his death. Cameraman Frank Stanley also thought climbing the perilous mountain to shoot a film was unnecessary. While filming on the Eiger, Stanley fell and sustained injuries that forced him to use a wheelchair for some time. Stanley blamed Eastwood for the accident because of lack of preparation, describing him as a director and actor as a "very impatient man who doesn't really plan his pictures or do any homework". One of the most dangerous stunts that Eastwood ever attempted involved him hanging from a rope 4000 ft above the valley floor in the penultimate scene. The scene required him to cut himself free so he could be pulled to safety by his rescuers. As he cuts the rope supporting his weight, he drops precariously before being saved by a rigged cable. Eastwood later said, "I didn't want to use a stunt man, because I wanted to use a telephoto lens and zoom in slowly all the way to my face—so you could see it was really me." After 5 weeks at the Eiger, the production unit traveled to Zurich to film the opening scenes of the film around the area of the Grossmünster cathedral and the Limmat River, the Münsterbrücke bridge, the Café Bauschänzli, the Kirchgasse, the Napfgasse, and the Restaurant Karl der Grosse.