Just saw a link to this virtual tour:
http://sem-s.de/k/b-hoehle/360b-hoehle.html

Some of the hauling techniques look impressive, including the railway and the monorail (although it takes a while to work out which way they are moving the spoil!), it'd be great to know more about the project. Also, if nothing else, the photography is excellent too!

Try
http://www.caveseekers.com/caves/Blaetterteighoehle/cave.html

Lovely photos - thanks for sharing that. It does look ever so clean and dry for a dig though.

God, I'm thinking of 'digging holidays' now, Ours are all so shitty...