• 7:13 - 9:41
THC 96: Richard Sauder | Underground Bases, Strange Experiments, & Secret Civilizations
Tunnel Boring Machines, Gargantuan Earthworm Technology
Richard Sauder describes the massive tunnel boring machines (TBMs) used to grind through solid rock, noting that some cutting faces reach diameters of 56 feet. These electrically powered machines function like gargantuan earthworms, trailing hundreds of feet of apparatus to remove debris as they create deep underground networks.