Jason Willinger

The training and the acclimatisation climbs are over; the expedition leaves Base Camp heading for the summit. David Tait and Phurba Tashi are within hours of the summit, but even if they make it, they're only a quarter of the way through their challenge.

After Russell announces the two summit teams, the expedition leaves for their summit attempts while David Tait and Phurba Tashi are getting close to the top. At Advanced Base Camp, some of the dangers of Everest are highlighted.

Daring climbers -- including a millionaire and a former astronaut -- again gear up to take on Mount Everest in the annual quest to reach the summit. The mountain is ready to rumble, with unpredictable weather and harrowing adventures in store.

Russell gives Team One a final talk before their summit attempt. After reaching the summit for a first time, David Tait and Phurba Tashi are descending on the south side -- out of radio contact.