Rock climber Alex Honnold does the unthinkable in documentary Free Solo

Climber Alex Honnold, poses for a picture on the letter "H" of the iconic sign, in the Hollywood Hills of Los Angeles, California on Feb 1, 2019. PHOTO: REUTERS
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LOS ANGELES - In 2017, celebrated rock climber Alex Honnold did the unthinkable: a rope-free ascent up El Capitan, the 900-metre sheer granite cliff that towers over America's Yosemite National Park.

No one had ever completed a "free solo" climb of the treacherous rock wall - in other words, climbing it alone and without any ropes or other safety gear.

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