Filming Fred Padula’s El Capitan began on May 20, 1968, with climbers Glen Denny and Lito Tejada-Flores among the team attempting to document one of the earliest ascents of Yosemite’s 3,000-foot Nose route. The production was conducted directly on the vertical wall, using the climbing equipment of the era: tubular-nylon swami belts instead of modern harnesses, pitons hammered into cracks, and early forms of removable protection. Because the ascent took three days, the climbers and filmmakers had to work through nightfall and sleep on tiny ledges suspended above Yosemite Valley. In one of the film’s most unnerving sequences, the screen is almost completely black as the team continues climbing after darkness overtakes them. During the belay, a bolt suddenly breaks loose and the climbers fall. They were fortunately unharmed, but the incident captured the genuine danger of making the film: the apparent 'set' was a sheer granite wall, and a failure in their protection system could have been fatal. Additional shooting continued into the fall and spring of 1969, while the footage remained in development and production for years before the completed film finally premiered at the San Francisco Museum of Modern Art in 1978.
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