Spanish athlete locked herself inside a 230-foot-deep cave for 500 days in an unusual experiment. When she came out, she thought only 160 days had passed

Published 2 July 2026 · science

Inside the 230-foot-deep cave where 500 days changed everything Why scientists wanted someone to live underground A life with no contact with the outside world

Inside the 230-foot-deep cave where 500 days changed everything Why scientists wanted someone to live underground A life with no contact with the outside world How she kept herself busy for 500 days The remarkable reason she believed only 160 days had passed The psychological effects of living completely alone A world that kept moving without her She even wanted to stay longer The significance of the experiment Spanish endurance athlete and mountaineer Beatriz Flamini spent 500 days alone inside a cave 230 feet beneath the Earth's surface without sunlight, clocks or direct human contact, all in the name of science. The unprecedented experiment was designed to understand how prolonged isolation affects the human brain, body and perception of time. Cut off from the outside world since November 2021, Flamini lived in complete solitude until emerging in April 2023. What surprised both her and researchers was not her ability to survive the ordeal but her distorted sense of time. Flamini believed she had spent only about 160 days underground, unaware that 500 days had actually passed.Hidden around 230 feet beneath the ground near Motril in Spain's Granada province, the cave that became Beatriz Flamini's home was unlike any ordinary living space. There was no sunlight, no windows and no changing weather to mark the passing of the day. The temperature remained relatively constant, while silence and darkness surrounded her for months at a time. A modest living area contained food, drinking water, books, cooking equipment and cameras to record her daily activities, but there were no clocks, calendars, televisions, mobile phones or internet access.Every meal, every hour of sleep and every waking moment unfolded without a single clue about the outside world.Flamini entered the cave on November 21, 2021, as part of the Timecave Project, one of the world's most ambitious studies on prolonged human isolation.

For nearly 17 months, the cave became both her home and a real-world laboratory where researchers examined how the mind adapts when completely detached from everyday life.The project brought together psychologists, neuroscientists, chronobiologists and cave specialists from several Spanish institutions to explore how extreme isolation affects memory, emotions, sleep and decision-making.Researchers wanted to understand how the brain functions when everyday reference points disappear. Without daylight, routines or regular social interaction, they hoped to observe how people adapt to an environment where the normal perception of time gradually fades. The findings could help scientists better prepare people working in highly isolated environments, from deep-sea missions to future journeys into space.Life inside the cave followed no schedule except the one Flamini created herself.She had no access to a mobile phone, television, internet, radio or newspapers, leaving her completely disconnected from current events. Food was periodically delivered to a designated point by the support team without face-to-face interaction, preserving the integrity of the experiment. Apart from emergency communication if absolutely necessary, she did not see another person throughout the entire 500-day challenge.Over time, daily routines such as reading, exercising and preparing meals became the only structure she had.Rather than simply waiting for the experiment to end, Flamini maintained a disciplined routine. She exercised regularly, read dozens of books, knitted, cooked, cleaned her living space and kept detailed journals. She also recorded video diaries that researchers later analysed to better understand how prolonged solitude influenced her behaviour and emotional wellbeing.One of the more unusual habits she developed was rarely speaking aloud.