Linda Moulton Howe reports on the newly discovered Comet Hale-Bopp while Richard Sauder presents compelling evidence for extensive secret underground installations across the United States. Sauder, author of "Underground Bases and Tunnels," discusses advanced excavation technologies including nuclear-powered boring machines capable of creating vast subterranean complexes. His academic background and meticulous research lend credibility to investigations into both legitimate underground facilities and more speculative claims about classified installations housing joint human-alien operations. The conversation covers everything from AT&T's documented underground telecommunications infrastructure to alleged deep underground military bases connected to UFO phenomena. Sauder addresses reports from military personnel and abductees who describe being taken to underground facilities, examining the intersection of government secrecy and extraterrestrial contact claims. The episode explores gravity anomaly detection methods, strategic rationales for underground installations during the Cold War, and technologies that might enable construction of facilities far beneath Earth's surface. Art Bell skillfully navigates between documented facts about legitimate underground construction and more controversial theories about hidden installations. This investigation raises profound questions about what might exist beneath our feet and challenges listeners to consider how much human activity remains hidden from public view.