Date- 19th Oct 11 Source- http://multimedia.esa.int/ 'ESA astronauts Tim Peake and Thomas Pesquet, Randolph Bresnik from NASA, Norishige Kanai from Japan and Sergey Ryzhikov from Russia went down to partly unexploded caves in Sicily on 17 September 2011 for six days. They lived and worked in the dark and humid underground environment for six days on ESA's CAVES 'mission'. The cave environment is isolated from the outside world, it has confinement, minimal privacy, technical challenges and limited hygiene and comfort. It is a completely new situation with interesting psychological issues: use of artificial light in constant darkness alters the perception of time and of colour and absence of natural time cues from daylight may alter the circadian rhythm and sleep patterns. Video has been shot shot on location and edited by Vittorio Crobu.'
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