If you’ve ever peered off a high-rise balcony and felt your stomach drop, you might not find this video very relaxing. Earlier this month Spencer Seabrook broke the World Record for solo slacklining, and a drone was there to film the whole thing. With no net, no harness and no shirt, the 26-year old Canadian daredevil successfully crossed a 64-metre gap between two cliffs in British Columbia, but not without a few potentially deadly trips and tumbles. The drop was only 290 metres—no biggie, right?Related:These 7 Daredevils Take Selfies To New HeightsExtreme Highliners Weave a Massive Web Between Mountains[Video] A Car Takes On an Obstacle Course Made of Drones