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In July 1962, French geologist and cave explorer Michel Siffre entered the Scarasson chasm in the Alps and remained underground for approximately 63 days. He deliberately removed clocks, calendars, sunlight, and ordinary time cues so he could study his body’s natural sleep-and-wake rhythm. Siffre communicated with a surface team when he woke, ate, and slept, but they did not reveal the time to him. As the experiment continued, his schedule drifted and his perception of short intervals became inc

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