Once climbers manage to cross the 8,000 m mark, they are said to enter what is known as the "death zone." This area of the Everest presents climbers with significant challenges against survival. It is said that, any part of the body, when exposed to air in this region, can easily get a frostbite. Fast blowing winds are another potential threat to life, apart from the drastically low atmospheric pressure. At the summit, climbers have access to only a third of the oxygen we normally require to breathe.