In 1997 Warren Macdonald, an Australian mountain climber, was climbing through a remote mountainside in Australia when a one-ton boulder fell onto his legs trapping him for 45 hours. This trauma resulted in both of his legs being amputated mid-thigh. After his rehabilitation, he returned to climbing using speciality climbing prostheses developed by Kevin Carroll and Hanger clinician Chad Simpson. In 2003 Macdonald climbed to the top of Mount Kilimanjaro in Tanzania, making him the first bilateral transfemoral amputee to accomplish such a feat.