"I thought I’d been down there for 35 days. It had been 63.”

https://dailygalaxy.com/2025/10/he-vanished-into-a-cave-for-63-days-and-came-out-discovery-shapes-science/ > In the summer of 1962, French geologist Michel Siffre descended 130 meters into the Scarasson cave in the French Alps. He left behind sunlight, clocks and calendars — and didn’t return for 63 days. What began as a glacier survey turned into a radical self-experiment in human time perception, one that would ultimately reshape modern science’s understanding of circadian rhythms and inspire decades of research across space medicine, neuroscience and sleep science. > 63 Days Underground, Alone and Timeless > At just 23 years old, Siffre had originally planned a brief geological survey. But he grew fascinated with one question: What happens to the human mind and body when it loses all sense of time? He designed a bold, stripped-down experiment. Inside the ice cave, there would be no sunlight, no clock, and no scheduled contact with the outside world — only a telephone for reporting when he woke, slept, or ate. > Within days, his perception of time started to shift. He no longer felt anchored to a 24-hour day. His internal cycles stretched — first to 24.5 hours, then to 36 hours of wakefulness in later experiments. ... > “I lost all notion of time,” Siffre recalled later. “I could tell if it was morning or evening, but that was it. I thought I’d been down there for 35 days. It had been 63.”

There are probably people on here who havent seen the sunlight for a lot longer

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