Lewis Pugh's mind-shifting Mt. Everest swim : After he swam the North Pole, Lewis Pugh vowed never to take another cold-water dip. Then, he heard of Mt. Everest's Lake Imja -- a body of water at an altitude of 5,300 meters, entirely created by recent glacial melting -- and began a journey that would teach him a radical new way to approach both swimming and think about climate change.

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Lewis Pugh swims the North Pole: Lewis Pugh talks about his record-breaking swim across the North Pole. He braved the icy waters (in a Speedo) to highlight the melting icecap. Watch for astonishing footage -- and some blunt commentary on the realities of supercold-water swims.

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