This episode explores ancient texts and legends that describe intelligent beings living beneath Earth's surface, focusing particularly on a passage from the Zohar, a mystical Jewish text compiled in the late 13th century from teachings attributed to second-century rabbi Shimon Bar Yochai. According to the episode, the Zohar describes "seven earths"—hidden realms beneath our planet's surface inhabited by both human and non-human intelligences. Ancient Aliens theorists point to similar accounts across cultures, including Buddhist legends of Shambhala, a subterranean city ruled by long-lived kings, and modern reports of reptilian humanoids witnessed in caves. The episode suggests these consistent cross-cultural narratives might indicate that Earth has hosted other intelligent species in underground environments for millennia, potentially explaining encounters attributed to supernatural beings throughout history.
Mainstream scholars view the Zohar's "seven earths" as mystical metaphor rather than literal geography—symbolic representations of spiritual realms or states of consciousness within Kabbalistic cosmology. The text emerged during medieval Spain's rich tradition of Jewish mysticism, when allegorical interpretations of reality were standard theological practice. Geologically, while Earth does contain vast cave systems and unexplored subterranean spaces, the extreme heat and pressure of deeper layers make them inhospitable to complex life as we know it. Still, the episode raises genuinely intriguing questions about why so many ancient cultures independently developed elaborate underworld mythologies, and whether these stories preserve dim memories of early human encounters with now-extinct hominin species who may have sheltered in caves.