It was May 4, 1975. The Japanese Women’s Everest Expedition team had been living at a high altitude for six weeks, and were less than a week away from their scheduled bid for the summit of Mount Everest. Exhausted, having established camp five at just below 8,000m on the south side of the mountain, Junko Tabei and her team descended to camp two at 6,300m to rest.

Then – avalanche!

In the early hours, tons of ice and snow engulfed the camp, burying several of the teammates. Crushed by the snow and ice, Tabei was unable to move. It took the strength of four Sherpas, the elite Nepali climbing guides assisting the expedition, to pull her out. Suffering severe bruising, Tabei argued that she did not need to be returned to base camp to recover, and would remain at camp two.

“There was no way I was leaving the mountain,” she later recalled in her .

It had taken five years for this group – the first all-women team – to get to Everest. The pressure on them to succeed was immense, given the limited number of annual international permits to climb Mount Everest issued by the Nepalese government. If they gave up, they might have to wait...