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.

Cast:Alex Honnold, Tommy Caldwell,

Genre:Documentary,

country:United States of America,

Production:National Geographic, Plimsoll Productions,