The 1970 British Annapurna South Face expedition was a Himalayan climb that was the first to take a deliberately difficult route up the face of an 8,000-metre mountain. On 27 May 1970 Don Whillans and Dougal Haston reached the summit of Annapurna I which at is the highest peak in the Annapurna Massif in Nepal. Chris Bonington led the expedition which approached up a glacier from the Annapurna Sanctuary and then used rock climbing techniques to put fixed ropes up the steep South Face. Although the plan had been to use supplementary oxygen, in the event it was not possible to carry any cylinders high enough for the lead climbers to use on their summit bid.