Death zone
In 2006, climber Lincoln Hall, had been left for dead on Everest on May 25, 2006. He did survive the event. The lack of oxygen in his blood made it easier for him to get frostbite.  He also had headaches, nausea, vomiting and hallucinations.  He said later this was caused by cerebral edema. This is a swelling of the brain.  This is caused at high altitude when blood leaks into the brain. It  can kill a person if the brain becomes too compressed.  Hall was left for dead after his breathing and heartbeat stopped.  He was found the next morning. A team of four, led by American climber Daniel Mazur, found Hall was sitting cross-legged near a ten-thousand foot cliff's edge. He was not wearing his gloves or hat. He also did not have any oxygen equipment and his climbing suit was not zipped . Mazur later said that Hall seemed lucid. He said that Hall's first words were, "I imagine you're surprised to see me here." A very large rescue operation was created and Hall was rescued. He lived for seven years after the event.. He spoke and wrote books about his experiences on Everest,. Hall died in 2012 from mesothelioma.