BBC News
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image captionFor 40 days and 40 nights, the cave-dwelling volunteers swapped modern comforts for basic necessities
A group of French volunteers have emerged from a cave after a 40-day study exploring the limits of human adaptability to isolation.
The 15 participants lived in the Lombrives cave in south-west France with no phones, clocks or sunlight.
They slept in tents, made their own electricity, and had no contact with the outside world.
The project aimed to test how people respond to losing their sense of time and space.
The so-called Deep Time experiment came to an end on Saturday, allowing the eight men and seven women, aged 27 to 50, who took part to leave the cave.