The UnXplained
S7 · E18 — Mysteries of the Underground
S7:E18 · Mysteries of the Underground
18 episodes in this season
The Golden Age of Pirates
42 min
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
