It's a new season on Everest, the world's deadliest mountain, and more climbers than every have arrived at Base Camp ready to risk their lives to stand on top of the world. Huge avalanches tear down the mountain at 200 miles an hour and strike terror into the hearts of rookies and expert mountaineers alike; an amateur climber makes Everest history with a daring dash for the summit but another pays the ultimate price as the biggest avalanche of the season buries climbers alive.