caving is cool..."it was so black it was nothing" about explains the worldI quite like being underground. I did a bit of caving when at uni as they had a speliology club there.
We went down one once in the middle of the hot Aussie summer. It was cool down there and we were crawling through squeezes for hours. When we put the lights off it was so black there was nothing.
When we finally got out the sense of colour was intense!
