Mysteries of the Underground (S07E18)
S07E18
Hidden beneath the ground are ancient tunnels, sacred caves, and mysterious pathways leading to a dark world formed by nature, shaped by human hands, and rich with legend. Are these subterranean spaces simply echoes of a bygone era?
Show
The UnXplained
Episode
S07E18
Air Date
Oct 31, 2025
Season 7 Episodes
S07E01
The Golden Age of Pirates
S07E02
Impossible Ancient Inventions
S07E03
The Lost
S07E04
Alien Contagion
S07E05
Ancient Bible Relics
S07E06
Islands of the Damned
S07E07
Tales From Antarctica
S07E08
Robot Revolution
S07E09
Secret Societies
S07E10
Secrets of the Spies
S07E11
Secrets of the Civil War
S07E12
Mysterious Urban Legends
S07E13
Mad Scientists
S07E14
Strange Tales from the American Frontier
S07E15
Terrors of the Deep
S07E16
Unlocking the Sixth Sense
S07E17
The World's Deadliest Assassins
S07E18
Mysteries of the Underground