This video depicts the route of the British attempts in the 1930s, from the Tibetan side via the Rongbuk Glacier and North Col, and offers a sense of the challenges those early climbers faced: Cold, wind, thin air, and unforgiving terrain. On this side of the mountain, the rock strata slope downward, making for treacherous footing. An enduring mystery is whether Mallory and Irvine summited in 1924 via this route (probably not). English subtitles. Running time: 57 min., 10 sec.