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ABC News
ABC News
National

Why have there been so many deaths on Mount Everest this spring climbing season?

A record number of permits where given for people to join expeditions up Mount Everest this year.  (Reuters: Navesh Chitrakar/File)

Australian engineer Jason Kennison was the 10th climber to die on Mount Everest this spring in one of the deadliest climbing seasons in recent history.

The 40-year-old South Australian man died of altitude sickness, where the brain swells from lack of oxygen, according to tour operator Asian Trekking.

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