In 2011, Sir Branson celebrated the completion of his spaceport in the New Mexico desert by abseiling down one side of it while swigging champagne straight from its bottle. (thetravelmagazine.net)
NASA's Jet Propulsion Laboratory is already developing a rover called Axel that can abseil down cliffs and could head into a Martian cave. (newscientist.com)
You will first abseil down a 10 meter cliff face after which... (sa-venues.com)