Documenting the two-month expedition and the struggles, highs, lows and triumphs as people from all walks of life attempt to climb Everest.

Russell spots a period of light winds that looks ideal for an early summit attempt. He'll have to push the climbers hard to be ready two weeks early.

The wait is over, and the groups set off on their five-day, 8,000-foot summit climb. It is a time of excitement, anxiety and extreme difficulty.

Team One heads into the `death zone', where the extreme altitude shuts down digestion and the body starts to consume its own muscle tissue for energy.

After a marathon 18-hour climb, members of Team One reach the summit. Mark Inglis becomes the first double amputee to make it to the top of Everest.

The climbers, suffering from summit fever, risk death as they refuse to turn back moments from the summit.