Part 5/13:
For instance, Hancock interprets the soft volcanic ash stone—carved with primitive handaxes dating purportedly back 12,000 years—as evidence of a prehistoric civilization capable of complex underground engineering. Milo counters that the tunnels are subject to natural formation, and the dating methods Hancock relies upon are not scientifically rigorous. The handaxes found nearby are dated to roughly 9,500 years ago, but their association with the tunnels is tenuous at best.