Honnold is familiar with the challenges of free-soloing, having climbed Yosemite’s 3,000-foot El Capitan among other feats, but ascending a skyscraper comes with its own unknowns.

American climber Alex Honnold don successfully climb up one Taiwan skyscraper without rope, harness or safety equipment.

The whole thing played out live at Taipei 101 on Netflix on Saturday, lasting a little over an hour and a half.