Tunnels: #3 Freefall

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.