Abseiling
（重定向自Absail）
An abseil (/ˈæbseɪl/ or /ˈɑːpzaɪl/; fromGerman abseilen, meaning "to rope down"), also called a rappel after its French name, is a controlled descent of a vertical drop, such as a rock face, using a rope.
Climbers use this technique when a cliff or slope is too steep and/or dangerous to descend without protection. Many climbers use this technique to protect established anchors from damage. Rope access technicians also use this as a method to access difficult-to-reach areas from above for various industrial applications like maintenance, construction, inspection and welding. Rescue teams are also known for using this method as a way to access injured or stranded victims.