In the manner of Lewis Carroll's Alice, Richard Stanley disappears down a series of holes in the ground to investigate the subterranean world of tunnels, caverns and conduits that thread their way across the country unseen beneath our feet.
This week our hero, aided and abetted by Anthony Burton, finds himself in the depths of a Cornish tin mine and a Welsh coalpit.
(Stereo/Binaural - The full binaural effect can only be heard through stereo headphones)