A Brave thrill-seeker walks across a highline above a huge 1,099 ft waterfall – without a safety harness. This incredible footage shows daredevil Spencer Seabrooke balance along a thin slackline suspended over the beautiful Shannon Falls in British Columbia, Canada. Filmed in August 2014, the 26-year-old was taking part in a highline festival which involved athletes from all over the world practising the vertigo-inducing discipline.