I've been interested in underground exploration for a few years now, i've got some pics of Farleigh down somewhere, that was one of the 1st places that i explored, i think the surface building has sadly been demolished, unless im mistaken. I've explored beneath the streets of Paris, known as the catacombs, around 300km's of passages from the disused quarry. Just a lil' starter for 10, wet your appetite kinda thing :-D