Not being a set of underground pictures, this is perhaps slightly off-topic... but it was so stunning in the Dales on Sunday that I thought I'd share a few of these:
http://www.flickr.com/photos/54400681@N03/sets/72157625421621515/
- Mark
http://www.flickr.com/photos/54400681@N03/sets/72157625421621515/
- Mark