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ALIn November 2021, Spanish extreme athlete Beatriz Flamini descended alone into a cave roughly 70 meters underground in southern Spain and cut off all contact with the outside world. No phone. No clock. No sunlight. The cave stayed near constant temperature, damp and silent, with total darkness except for a headlamp. Supplies were lowered periodically, but no one spoke to her and no updates about the world were given. Days had no markers. There was no sunrise or sunset, no external noise, no human voice. Flamini reported hallucinations early on, including distorted sounds and the sense that time was folding in on itself. Sleep cycles broke down. She journaled obsessively to keep track of her thoughts, rationed food, and exercised in the confined space to prevent physical collapse. At points she believed she had been underground for only a few months when far more time had passed. The isolation took visible physical tolls. Weight loss, muscle atrophy, and sensory distortion were documented by researchers monitoring the experiment from above. Medical teams later confirmed her circadian rhythm had completely decoupled from real time. She lost the ability to accurately estimate days, weeks, or seasons. The cave became the entire world, with no reference point for before or after. After 500 days underground, Flamini emerged in April 2023. She believed she had spent about 160 days below the surface. Medical staff immediately intervened, documenting severe disorientation, weakness, and delayed cognitive processing. She was escorted away for evaluation as researchers confirmed she had completed 500 consecutive days in isolation, setting a world record.
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