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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