Four years after enduring an accident that nearly left him paralyzed, Australian mountaineer Steve Plain is now the fastest person to reach the top of the tallest mountain on each of the worldâs seven continents, shattering the previous record by eight days. Earlier this morning, Plain, along with his guides Jon Gupta and Pemba Sherpa, reached the top of Mount Everest, completing the seven-summit tour in just 117 days, as AFP reports.