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Abseiling, also known as rappelling, is a technique used for descending a vertical or near-vertical surface, such as a rock face, cliff, or building. This adventure sport requires the use of a rope and a specially designed device, known as a descender, to control the descent. Abseiling is often used as a means of access or egress in climbing, canyoneering, and caving, and it is also a popular activity in its own right. The basic technique of abseiling involves the use of a harness, which is a...