Actually I was just saying that they weren't keeping it totally secret; & it's not unique either:
http://www.panoramio.com/photo/114056946
& these would presumably be more prolific if it wasn't for the metal lining:
https://www.ianvisits.co.uk/blog/2013/09/09/photos-from-inside-an-abandoned-tube-tunnel/
Also there's one in South Wales, although I can't remember the name of it.
The profusion of formations in Ogof Capel are probably also due to the limeworkings above.
Mike
http://www.panoramio.com/photo/114056946
& these would presumably be more prolific if it wasn't for the metal lining:
https://www.ianvisits.co.uk/blog/2013/09/09/photos-from-inside-an-abandoned-tube-tunnel/
Also there's one in South Wales, although I can't remember the name of it.
The profusion of formations in Ogof Capel are probably also due to the limeworkings above.
Mike