French volunteers emerge from cave after 40-day isolation study

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The underground isolation experiment saw the subjects, aged between 27 and 50, give up watches, phones and natural light, exchanging modern comforts for a cave system with a constant 12 Celsius temperature and 95 percent humidity.

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A group of 15 volunteers has left a cave in southwestern France where they had stayed for 40 days, in an study called the "Deep Time" project probing the limits of human adaptability to isolation, reports RFI.