The UnXplained · SEASON 7

Mysteries of the Underground

Episode 18 · 2025-10-31

★ 5.0
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The UnXplained poster
Season 7Episode 18★ 5.0/10
  • Documentary

Episode overview

Beneath our feet lie hidden ancient tunnels, sacred caves, and shadowy passages into a world of darkness shaped by nature, carved by man, and steeped in myth. Are these underground realms mere remnants of the past?

42 minutes

Season 7 episodes

1. The Golden Age of Pirates2024-10-04 2. Impossible Ancient Inventions2024-10-11 3. The Lost2024-10-18 4. Alien Contagion2024-10-25 5. Ancient Bible Relics2024-11-01 6. Islands of the Damned2024-11-08 7. Tales From Antarctica2025-06-06 8. Robot Revolution2025-06-13 9. Secret Societies2025-06-20 10. Secrets of the Spies2025-06-27 11. Secrets of the Civil War2025-07-11 12. Mysterious Urban Legends2025-07-18 13. Mad Scientists2025-07-25 14. Strange Tales from the American Frontier2025-08-01 15. Terrors of the Deep2025-10-03 16. Unlocking the Sixth Sense2025-10-10 17. The World's Deadliest Assassins2025-10-17 18. Mysteries of the Underground2025-10-31