Nova: Deadly Ascent

With the highest and coldest peak in North America, Alaska's Mount McKinley (commonly referred to as Denali) is one of the deadliest mountains on Earth. This enthralling "Nova" documentary follows a team consisting of medical researchers, rescuers, mountaineers, military special forces members, and an astronaut as they employ NASA technology to try to unravel Denali's secrets-including that of a mysterious disease that strikes climbers at extreme altitudes. 56 min.