The film’s editor, Angus Breton, said: “They are old mine workings and they are very dramatic environments so there is a bit of danger and excitement in the film.
“I think that’s really the crux of it because when they’re down there, taking risks together, that’s when everything else melts away and they can really find this kind of peace.
“When you’re down a mine shaft with your life on the line, you’re not worried about your bills, you’re not worried about that little argument with your wife the night before, it all just goes away and you can find that quietness that everyone is looking for.”