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The family of a Nepali climber who dragged himself off Mount Everest six days after being abandoned called for an investigation into rescue efforts, as doctors said on Friday he is in a stable condition and recovering in hospital.

Mountaineer Dawa Sherpa, 57, vanished in bitter conditions on the upper reaches of the world’s highest mountain early on May 30.

His family thought he was dead and had even begun ritual mourning prayers.

He was found crawling towards Base Camp on Thursday morning by the Sagarmatha Pollution Control Committee (SPCC), a Nepali team that helps set routes on Everest and clean up waste left behind.