It was the ultimate whitewater adventure on the Mount Everest of rivers, and the biggest challenge of their lives.... October 1998 an American whitewater paddling team traveled deep into the Tsangpo Gorge in Tibet to run the Yarlung Tsangpo, known in paddling circles as the "Everest of rivers." On Day 12 of that trip, the team's ace paddler, one of four kayakers on the river, launched off an eight-foot waterfall and flipped. He and his overturned...