The UnXplained
S07E18 Mysteries of the Underground
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?
Season 7 Episodes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
The Golden Age of Pirates
Impossible Ancient Inventions
The Lost
Alien Contagion
Ancient Bible Relics
Islands of the Damned
Tales From Antarctica
Robot Revolution
Secret Societies
Secrets of the Spies
Secrets of the Civil War
Mysterious Urban Legends
Mad Scientists
Strange Tales from the American Frontier
Terrors of the Deep
Unlocking the Sixth Sense
The World's Deadliest Assassins
Mysteries of the Underground