An elite group of climbers saved a French mountaineer in a daring night-time rescue on a Pakistan peak nicknamed "killer mountain", but officials on Sunday called off the search for a second missing climber.
The team of Polish climbers — with support from the Pakistani military — launched the attempt to rescue stranded French mountaineer Elisabeth Revol on Saturday afternoon, but were unable to reach Polish national Tomek Mackiewicz on Nanga Parbat.
"The rescue for Tomasz is unfortunately not possible — because of the weather and altitude it would put the life of rescuers in extreme danger," wrote Ludovic Giambiasi, a friend of Ms Revol, in a series of updates on Facebook.
"It's a terrible and painful decision."
The four rescuers were flown by the Pakistani military from the base camp of K2 — the world's second-highest peak — to reach the stranded climbers.
They were part of a Polish expedition seeking to become the first mountaineers to summit K2's peak during the winter, when good climbing days are rare.
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"The K2 climbers who stopped their historic effort for a winter K2 summit will descend with Elisabeth Revol — one life saved," Karar Haideri, spokesman for the Alpine Club of Pakistan, said on Sunday.
The team was evacuated by helicopter after a five-and-a-half-hour descent down the mountain to Nanga Parbat's Camp One early on Sunday.
The group was then airlifted by helicopter to a hospital in nearby Skardu, where Ms Revol was set to be treated for a number of injuries.
"[Ms Revol] has frostbite and some [snow] blindness," said Asghar Ali Porik from Jasmine Tours, who helped organise the K2 expedition.
Pakistani climber Karim Shah, who was in contact with the expedition, said the rescue effort was unmatched in the climbing world, with the team ascending 1,200 metres in complete darkness along a treacherous route without a fixed rope.
"No one did such a climb before," said Mr Shah.
"Most people, it takes two or three days, and they did it in eight hours in the darkness."
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Following the operation, the Polish team is set to return to the K2 base camp where it will continue its summit attempt.
"This operation hasn't affected the K2 [expedition]," said Michal Leksinski, a spokesman for the team.
"This will go into the history of mountaineering. It was one of the greatest rescue attempts in history."
The rescue mission was launched after the missing alpinists were located on Friday by fellow mountaineers using binoculars, who spotted Ms Revol attempting to climb down while Mr Mackiewicz appeared to be crawling due to frostbite.
The pair ran into trouble after making a late descent to a camp on Thursday. They were trapped on the side of the mountain for the night without a tent, battered by frigid temperatures and high winds, said Mr Shah.
Nanga Parbat, in northern Pakistan, is the world's ninth-highest mountain at 8,125 metres.
It earned the nickname "killer mountain" after more than 30 climbers died trying to climb it before the first successful summit in 1953.
The mountain was first summited in the winter in February 2016 by Italian alpinist Simone Moro and his team — Alex Txikon of Spain and Pakistani climber Ali Sadpara — who overcame frostbite and pummelling winds to reach the peak.
In July last year, a Spaniard and an Argentinian were presumed dead after they went missing while trying to summit Nanga Parbat.