Swiss-French explorer-researcher Christian Clot gives a press conference before he and 14 volunteers spend 40 days in a grotto as part of a scientific experiment at the Prehistory Park in Tarascon-sur-Ariege on March 14, 2021. - Almost a year after the first lockdown in France, Christian Clot and 14 volunteers aged between 27 and 50 will live from March 14, 2021 in the Lombrives cave in Ariege for 40 days without seeing the light of day or having notion of time. (Photo by GEORGES GOBET / AFP) (Photo by GEORGES GOBET/AFP via Getty Images)
