When an avalanche killed climber Nirmal Purja, his friends faced the hardest mission of all

As he picked his way past the frozen slope towards two bodies, Mingma Gyalje Sherpa knew his friends were gone. Together, the three of them had climbed the world's highest peaks, under crisp mountain skies and in treacherous snowstorms. Nirmal Purja and Kili Pemba Sherpa were two of the strongest climbers Mingma G had ever known. But this July, an avalanche swept through Pakistan's Broad Peak while the two were on their way up, engulfing everything in its path. The drone images seemed clear: no-one had survived.

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