Illustrated by Brian Williams.
After Deeper, can the Tunnels adventure be any more dangerous? And where will it end? Will Burrows and his gang are far from finished as they free-fall down a subterranean pore. As they experience reduced gravity, the dark mysteries of the deep unfold and they discover a strange fungal shelf, which reveals not only artifacts from ancient civilisations, but also clues to a lost land at the end of the Earth.
Ages: 9+
