Watch ‘Untethered’: The Terrifying Art of Free Solo Slacklining

Spencer Seabrook set the world record for the longest free solo highline in Squamish, British Columbia, in 2015. Watch him walk a 200-foot line without safety equipment 750 feet above the ground.

“Untethered” is a film by Levi Allen. It originally released in 2015 but was taken down due to contracts. Now, the filmmaker re-uploaded the 30-minute documentary all about the slacklife.