The World's Biggest Urban Zipline

For Speed Stick's #GearChallenge campaign, extreme filmmaker and YouTube sensation Devin Graham, aka Devin Supertramp, took to Panama City to test the world's largest urban zip line. Starting atop a 700-foot tall building, a group of fearless aerialists began their descent attached to a 10,000-foot long zip line, but the shock comes when the first lets go of his safety clip to freefall to the ground. This was all a part of the plan however, as each of them promptly opened a parachute to land saf...