The events in the final climbing scenes are loosely based on the 1936 Eiger tragedy, when, during an attempt to the first ascent of the North Face all four members of the climbing party (Andreas Hinterstroisser, Toni Kurtz, Willy Angerer and Edi Reiner) died in circumstances that are picked up in this film. Willy Angerer was injured by rockfall during the ascent (the french climber in the film). After attempting to escape the face by ascending, the party decided to retreat but got stuck on the way down above the Hinterstroisser traverse. This passage had been first climbed by Andreas Hinterstroisser on their way up, however they could not cross it back due the fact that they had not left fixed ropes in place, combined with ice covering the rock since the weather had meanwhile deteriorated (as shown in the film). The climbers tried a desperate attempt to abseil down an overhanging section of the wall, approximately above the railroad window (as shown in the film), but Hintertroisser, Reiner and Angerer fell to their deaths in the attempt. Toni Kurtz, like Eastwood in the film, survived the fall but was hanging from a rope and unable to abseil or climb back. A rescue party of mountain guides managed reaching a position directly below Kurtz and provide him with a rope to abseil. Tragically, unlike Eastwood in the movie, Kurtz had by then reached the limit of his strength and, when his carabiner got stuck into a knot in the rope, he was unable to cut the rope above him with his frostbitten hands and free himself. He died only a few meters above his rescuers. These events have been later portrayed on film with more strict factual adherence in 'The Beckoning Silence' (2007) and North Face (2008).