Hollow Earth Theory
Referenced in 2 episodes
Definition
A concept proposing that the Earth contains substantial interior space, which may be occupied by advanced civilizations or other beings, often explored in speculative fiction and conspiracy theories.
Related episodes
36.16 - MU Podcast - Beneath the Pyramids
Mysterious UniverseOct 23, 2026
Hosts Joe Hodgkin and Brandon Thomas recount Andrew Collins' 2009 book 'Beneath the Pyramids', which describes his search for a forgotten cave system beneath the Giza plateau first entered by Henry Salt and Giovanni Caviglia in 1817. Collins, his wife Sue and researcher Nigel Skinner-Simpson repeatedly entered the Tomb of the Birds and found natural caverns with apparent chisel marks, while dodging guards, bats and toxic guano dust. The story ends with a local legend of a giant guardian serpent protecting a Hall of Records, and with Zahi Hawass promising documentation that never arrived.
36.11 - MU Podcast - This Hollow Earth - Episode 01: Deep Lore
Mysterious UniverseSep 24, 2026
Mysterious Universe launches a multi-part saga based on Warren Smith's 1970s book This Hollow Earth, exploring the claim that vast inhabited worlds exist beneath our feet. Hosts Brayden Thomas and Joe Hodgdon cover Edmund Halley's concentric-sphere theory, the Agartha legend, the sinister Deros, and the deathbed tale of Norwegian sailor Olaf Jansen, who claimed to have lived among giants inside the Earth. The episode also ties hollow Earth lore to UFOs emerging from below, secret chambers under the pyramids, Nero's hunt for subterranean treasure, and reports of underground cities and beings.