I don't like putting up reports when i've not discovered the site, but I've done so for two reasons:
1) The "finders" don't have cameras that work in the dark
2) The subsequent photos from Spark, Pixie and Bigjobs are going to be better.
I'm only showing a small selection because there are limits to what could be photographed down here (very much like Cathedral Steps) and I want to give everyone a chance to show something good.
Anyway, this place is OUTSTANDING, one of the finest underground structures I've visited for a long while. The caverns are enormous and go on for what seem like hundreds of yards.
Each level of the "pallets" in my photos (actually concrete sleepers) is at least a foot thick, so that should give you some scale.
The underground stream was also a bonus.
Present: Bigjobs, Pixie, Spark, Gibbo, and three new members who will be on shortly (Adam, Andy and arrrgh I've forgotten your name I'm so sorry, especially as we had some great conversations down there about local sites)