Updates to mortality on Mount Everest: 1921-2024

Area of Science:

• Mountaineering Safety
• Extreme Altitude Physiology
• Retrospective Observational Studies

Background:

• Mount Everest attracts increasing numbers of climbers annually.
• Evolving climbing techniques may influence mountaineer mortality patterns.
• Understanding historical and recent mortality trends is crucial for safety.

Purpose of the Study:

• To compare Mount Everest climber mortality patterns between two distinct periods: 1921-2006 and 2007-2024.
• To analyze changes in mortality rates and causes in relation to climbing advancements.
• To identify specific risks faced by climbers versus support staff (Sherpas).

Main Methods:

• Retrospective observational study utilizing data from the Himalayan Database.
• Analysis of mountaineer death accounts from 1921 to 2024.
• Comparison of mortality rates and incident altitudes between different climber groups and time periods.

Main Results:

• Overall mortality rate on Mount Everest decreased from 1.4% (1921-2006) to 0.7% (2007-2024).
• Climber fatalities on summit day remain high (76.5%), while Sherpa fatalities are concentrated during route preparation (82.2%).
• Mortality during summit descent decreased significantly but remains higher for climbers than Sherpas.

Conclusions:

• While overall mortality on Mount Everest has declined, significant risks persist, especially at extreme altitudes.
• Profound exhaustion and impaired consciousness are common causes of death above 8000m.
• Further safety improvements are possible, informed by persistent mortality patterns and awareness of risks during descent and at high altitudes.