" My thoughts earthwormed down inside my body, chewing through my inner architecture. It was the feeling of being peeled open, turned inside out. I felt the rhythmic clenching of my heart, my lungs ballooning inside my ribs, my epiglottis flapping open and shut. In the absence of sight, my other senses bloomed. The sound of the stream, which I’d barely noticed when I entered the cave, now filled the whole chamber, unfurling in effusive patterns. Smells—mud, damp limestone—thickened to the point of feeling material. I could taste the cave. "

― Will Hunt , Underground: A Human History of the Worlds Beneath Our Feet