Not underground (but the mines get mentioned) - think this may be of nterest to some:
https://www.bbc.co.uk/iplayer/episode/b0bsrqky/pubs-ponds-and-power-the-story-of-the-village-series-1-east-midlands

The outflow of Cromford Sough was diverted to feed the mill; the current entrance to the sough is through a feature locally known as the "Bear Pit".

The Bear Pit does feature