evidence: Mount Everest summit attempt in winter to be first in 27 years if successful [...] - Only a handful of climbers have made the summit of Everest in winter, these men will try without additional oxygen - Spaniard Alex Txikon has already summited famed Himalayan peak Nanga Parbat in the winter - Twelve people died on Mount Everest during the 2019 climbing season. [...] While there are no rules prohibiting climbers from attempting to scale Everest during the winter, only a handful have reached the mountain's 8,850-metre-high peak during that season.