Why do people risk their lives to summit the world's deadliest mountains?
Historian Natalia Mehlman Petrzela explores life, love and death on Earth's second-tallest peak in the new season of Extreme.
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THE SUMMIT: The story of the deadliest day on the world's most dangerous mountain
The first person to reach K2's summit ... of the disaster. Some people, including McDonnell, Van Rooijen, and Confortola decided to wait until morning to descend the mountain.