Jump to navigation Andy Lewis walks on a slackline roughly 45ft long, and about 100ft high off the ground, in an area called the Sand Flats in California, with no safety equipment... Credit: Heinz Zak / Barcroft Media ...Not satisfied that his act is risky enough, the daredevil decided to up the stakes by balancing on a part of the body not designed for walking on - his ankles Credit: Heinz Zak /