I doubt if anything like that would be remotely acceptable, if you could get anyone to go back underground these days. Funnily enough in High Pit Wilmas reply, I can confirm it was just as bad early 1960s at the High Pit Choppington. In fact they were a HELL of a lot worse. Look at those conditions in the photos above, almost a palace compared to the High Pit, then add lots of water underfoot, we wore wellingtons, and constant dripping of water. I swear we were under the River Wansbeck!
Happy days!