In 1962, French geologist Michel Siffre spent two months in an underground cave

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In 1962, French geologist Michel Siffre spent two months in an underground cave. He did this to learn more about our biological clock and perception of time   In 1962, French geologist Michel Siffre,  French geologist,  Michel Siffre,  an underground cave, biological clock, perception of time

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00:00In 1962, French geologist Michael Siffre spent two months in an underground cave.

00:08He did this to learn more about our biological clock and perception of time.

00:15Michael lived underground without a clock, calendar or sun,

00:20eating and sleeping based only on his internal sensation.

00:25To check the result of the experiment, Siffre set up a camp for his colleague at the entrance to the cave.

00:35He signaled when he woke up, ate and went to bed.

00:40As a result of the experiment, Michael's internal clock switched to a 48-hour mode.

00:48This day became twice as long.

00:53If we tried to count two minutes, it turned out to be almost five.

00:59And when it was time to end the experiment, Siffre was sure that only half of it had passed.

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