In this episode of The Box of Oddities, Kat and Jethro wander into one of the strangest phrases ever to appear in official U.S. government records: “Unexplained human presence detected.” Buried inside real Freedom of Information Act documents, this calm, clinical line appears again and again across decades of federal incident reports—acknowledging signs of human movement, interaction, and intention… without ever finding a human being. What does it mean when trained professionals confirm a presence, rule out mechanical causes, and then simply stop writing? The conversation drifts through surveillance systems, human perception, AI pattern recognition, and that deeply familiar feeling that someone was just there—close enough to leave a trace—before vanishing. From there, the episode plunges (sometimes literally) into Devil’s Hole, Nevada: a narrow limestone fissure hiding a warm surface pool, a bottomless-seeming abyss, and the only natural habitat of the critically endangered Devil’s Hole pupfish. The hosts explore how this unassuming opening drops more than 1,200 feet into darkness, has claimed multiple divers, reacts to earthquakes thousands of miles away, and even attracted the obsessive attention of Charles Manson. With stories of vanished bodies, seismic sloshing, baffling depths, and fragile life clinging to a single rocky shelf, this episode blends government mystery, geological terror, and existential unease—plus a brief, emotional detour involving a rescued monarch butterfly named Crumplewing. As always, it’s strange, funny, unsettling, and just grounded enough in real documentation to make it linger long after the episode ends. Learn more about your ad choices. Visit megaphone.fm/adchoices