The Devil's Climb

Climbers Alex Honnold and Tommy Caldwell set out on a daring expedition to tackle Alaska's formidable Devils Thumb. Battling harsh conditions and daunting peaks, they push their physical and mental limits, while their deep friendship faces its toughest trial yet.

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'The Devil’s Climb': Tommy Caldwell & Alex Honnold on Their 'Crazy' Nat Geo Buddy Trip

Documentary sees pals trek 2,500 miles by bicycle, sailboat and foot before climbing 9,000 ft peak.