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The Khumbu Icefall is an icefall at the head of the Khumbu Glacier and the foot of the Western Cwm, which lies at an altitude of 5,486 metres (17,999 ft) on the Nepali slopes of Mount Everest, not far above Base Camp and southwest of the summit. The icefall is regarded as one of the most dangerous stages of the South Col route to Everest's summit. The Khumbu glacier that forms the icefall moves at such speed that large crevasses open with little warning. The large towers of ice or seracs found at the icefall have been known to collapse suddenly. Huge blocks of ice tumble down the glacier from time to time; their size ranging from that of cars to large houses. It is estimated that the glacier advances 0.9 to 1.2 m (3 to 4 ft) down the mountain every day.
Most climbers try to cross the icefall during the very early morning, before sunrise, when it has partially frozen during the night and is less susceptible to movement. As the intense sunlight warms the area, the friction between the ice structure lessens and increases the chances of crevasses opening or blocks falling. The most dangerous time to cross the Khumbu Icefall is generally mid- to late-afternoon. Strong, acclimatized climbers can ascend the icefall in a few hours, while climbers going through it for the first time, or lacking acclimatization or experience, can make the journey in 10–12 hours. "Camp I" on Everest's South Col route is typically slightly beyond the top of the Khumbu Icefall.
On occasion, a climber will experience a large block of ice crashing down in their vicinity. The resulting blast of displaced air and snow can result in a billowing cloud of light ice and snow being deposited on a climber. This is sometimes referred to as a "dusting." To those that have experienced it, it is a very unnerving experience. If a climber is caught in an avalanche or other "movement" event in the icefall, there is very little they can do except prepare for potential entrapment by heavy blocks of ice, or immediate movement afterwards to try to rescue others. It is virtually impossible to run away, or even to know which way to run.
People who have died in the icefall and whose bodies have not been recovered have reportedly shown up at the base of the icefall many years later as the ice continually migrates downward toward Everest base camp. In these cases, the bodies have been recovered and given proper burials.
Since the structures are continually changing, crossing the Khumbu Icefall is extremely dangerous. Even extensive rope and ladder crossings cannot prevent loss of life. Many people have died in this area, such as a climber who was crushed by a 12-story block of solid ice. Exposed crevasses may be easy to avoid, but some may be hidden under dangerous snow bridges through which unwary climbers can fall.
Around 6:30 am local time on the morning of 18 April 2014, sixteen Nepalese climbers were killed by an avalanche in the Khumbu Icefall. As of 22 April, thirteen bodies have been recovered and three remain missing, presumed dead. The climbers were preparing the route through the dangerous icefall for the Spring climbing season when the avalanche engulfed them. Nine others were also injured with blunt trauma injuries.
- UNITEC Institute of Technology. "Hillary Challenge". Ministry of Education, Wellington, New Zealand. Retrieved 2009-01-30.
- "Mount Everest avalanche kills 12 Nepalese guides". CBC News. 18 April 2014. Retrieved 2014-03-18.
- Krakauer, Jon (21 April 2014). "Death and Anger on Everest". The New Yorker. Retrieved 22 April 2014.
Of the twenty-five men hit by the falling ice, sixteen were killed, all of them Nepalis working for guided climbing teams.
- Burke, Jason; Rauniyar, Ishwar (18 April 2014). "Mount Everest avalanche leaves at least 12 Nepalese climbers dead". The Guardian. Retrieved 2014-03-18.
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