The Edge (1977)

The Edge is an extreme sports film directed by Roger Brown and filmed by Barry Corbet. The work employed small cameras to capture point-of-view whitewater kayaking, mountaineering, freeskiing, and hang gliding. The last segment consisted of two hang-glider pilots ascending a very tall peak in Canada and flying from the summit. They experienced rapid sink rates and were constrained to fly a short distance in ground effect above a crevasse-laced glacier. A large snow avalanche, captured on their cameras, slid behind them and pushed both pilots off the glacier and over a steep face. From that point both were able to land without injury.