Why is living and working underground in a cave similar to being in space? Experienced spacewalkers and astronauts from ESA's underground training course CAVES explain how climbing down a cavern is not unlike spacewalking across the International Space Station.<br /><br />ESA astronaut Paolo Nespoli, Canadian Space Agency astronaut Jeremy Hansen, NASA astronauts Jack Fischer and Mike Barratt recount their experience of spending a week hundreds of metres underground. <br /><br />Subtitles are available in English, French and German.
