For every twelve climbers who make it back from the summit, one dies.
This is David's third time summiting, and Phurba's fifteenth.
The spot where Mogens slips off the path and is saved only by the rope he's attached to is the same spot where Tim fell the year before.
Climbers over age sixty are ten times more likely to die on descent than younger climbers. A quarter of the climbers over sixty die on descent.
In his excitement upon summiting, Rod forgets that he must wear his goggles to protect his eyes. Unprotected for twenty minutes, he has perhaps eight hours before his eyesight begins to be dangerously impaired. Snow blindness usually takes about 48 hours to heal, but in serious cases, blindness can be permanent.
His climb funded by Motorola, Rod makes the first cell phone call from the peak of Mt Everest. He taped the cell phone battery to his chest to keep it from freezing.
Russell has a live feed to the Sherpacams rom the Discovery Channel's live feed for the first time during a summit attempt, giving him the opportunity to assess his climbers more clearly than ever before.
Tim breaks several bones in his right hand early into his final push for the summit, but doesn't tell Russell of his injury for fear that he'd be told to turn around.
Supplemental oxygen is necessary up in the Death Zone, but it has dangers of it's own. In order to keep the lines from freezing, all water has been removed. As a result, those who are breathing it are being dehydrated by it at the same time.
Kobayashi Yuzo (Japanese Climber)
Yoshida Takenori (Japanese Climber)
Josette Valloton (Swiss Climber)
Each bottle of oxygen carted up the mountain costs $650, so any climber who wants to start on oxygen early has to pay a hefty price for the privilege.
Ultraviolet radiation increases 5% for every 1,000 feet. At the Second Step (28,300 ft), where the Irish climber lost his glasses for 20 minutes, the UV radiation was 15 times the safe limit, causing snow blindness. Snow blindness is a severe sunburn of the cornea, and in extreme cases, the accompanying blindness can become permanent.
David and Phurba pass the South Col, which is the most dangerous stretch on Mt Everest, and the location of the highest single day death toll on the mountain. In 1996, eight people lost their lives in one day. This inspired the Jon Krakauer book "Into Thin Air", which Tim read while in the hospital after his accident, and made him decide to climb Everest.
South Side Elevations:
*Hillary Step - 28,850 ft (8,793.5 m)
*South Summit - 28,700 ft (8,748 m)
*Balcony - 27,500 ft (8,382 m)
*South Col Camp 4 - 26,000 ft (7,925 m)
*South Camp 3 - 24,300 ft (7,407 m)
*South Camp 2 - 21,300 ft (6,492 m)
North ABC is at the same elevation as South Camp 2.
David summits for the second time, having first summited in 2005. But he is only one quarter of the way through his double traverse of Everest, having to go down the south face, and then climb back up the south face to summit a second time, and then return back down the north face. This is Phurba's eleventh summit, but he has never climbed the south face of Everest.
In the Death Zone, climbers bodies are burning a 1,000 calories an hour, the same as a marathon runner.
Aside from being potentially explosive if mishandled, oxygen released from the bottles when opened to connect it to the climbers airmask rapidly cools, and can easily cause frostbite if the climber isn't wearing gloves while changing bottles.
David is dedicating his climb to raising awareness of child abuse, and to prove that being the victim of child abuse doesn't mean that a person can't achieve the highest goals in life.
To make a safe weather window for the double traverse, David and Phurba are told that they must skip Camp 2 and continue climbing to Camp 3. But previously it was said that climbers must acclimatize overnight every 1,500 feet or risk dangerous altitude sickness, and they will be doubling that distance in their climb.
Russell again divides his clients into two teams of climbers going up on different days. Team one is for the faster climbers, and includes Rod, Darius, Fred, and surprisingly, Tim. Team One also includes Chinese climber Li Yong.