Scientist Spends 5 Days in Pitch-Black Cave, Revealing New Insights into Human Consciousness

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Bioengineer Kiana Aran spent five days alone in a pitch-black cave in rural Poland, outfitted with biosensors to track changes in her body and brain. The removal of light and sound caused surprising reactions, including heightened senses, altered immune response, and even hallucinations. Aran hopes the data can provide new insights into human consciousness and how we perceive the world.

Why it matters

Sensory deprivation studies have been conducted for decades, but usually involve shorter stays. Aran’s extended time in the cave provides a rare opportunity to observe the long-term physiological and psychological effects of complete isolation from external stimuli, which could lead to a better understanding of the human mind and body’s response to such conditions.

The details

During her five-day stay, Aran’s body exhibited several notable changes. Her olfactory receptors spiked, making food taste more intense. Her immune system became activated, as if her body sensed something was wrong. Her glucose metabolism also shifted, likely due to the disruption of her circadian rhythm. By the second day, her skin and saliva microbiome had altered, though her gut microbiome remained more resilient. Mentally, Aran experienced hallucinations and restlessness, but eventually found a sense of calm and appreciation for the people in her life.

• In November 2024, Aran entered the underground cave in rural Poland.
• She emerged from the cave five days later.

What they’re saying

What’s next

Aran plans to continue experimenting with sensory deprivation, including repeated use of sensory deprivation tanks over six weeks, to further study the body’s responses to a lack of external stimuli.