Claustrophobia, I used to to work in the pit.
It wasn't that bad, as long as your lamp worked.
Turn your helmet lamp of in some areas of the pit and you couldn't see jack.
If your lamp failed, and you were in a tight restrained area, good luck.
Old argument.
What colour is a red scarf in 'total' darkness.
Answer, black.
You can't see it.
It's only red when light reflects off it.
If a spanner falls of a shelf in your shed (wind), and your not there,
does it make a noise.
Answer, no.
Only to the people who hear it fall.