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S7E17

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S07E18: Mysteries of the Underground
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?
Genres:
Documentary
Air Date:
Oct 31, 2025
Runtime:
42 minutes
Production:
Prometheus Entertainment
Casts:
William Shatner, Tok Thompson
The UnXplained
Season 1
E1
Evil Places
E2
Mysterious Structures
E3
Strange Creatures
E4
Unnatural Nature
E5
Bizarre Rituals
E6
Life Beyond Death
E7
Mysteries of the Mind
E8
Incredible Survivors
E9
The Oak Island Curse
E10
Dark Prophecies
E11
Lost Civilizations
E12
Deadly Cults
E13
Extreme Weather Mysteries
E14
Mysterious Stones
E15
Vampires and Werewolves
E16
Amazing Animal Abilites
Season 2
E1
The Greatest Escapes
E2
Superhuman Senses
E3
Mysterious Curses
E4
The Truth About UFO's
E5
The Underground World
E6
Leading Double Lives
E7
Mysteries of the Bible
E8
Mysterious Mummies
E9
Secrets of America's Monuments
E10
The Search for Atlantis
E11
Extraordinary Engineering
E12
The Power Of Gold
E13
The Truth About Bigfoot
E14
Bizarre Vanishings
E15
Serial Killers
E16
The Mystery of Plagues
E17
Mysteries of the Moon
E18
Outrageous Robberies
Season 3
E1
The Hunt for Hidden Treasures
E2
Satanic Encounters
E3
The Search for the Ark of the Covenant
E4
Apocalypse When?
E5
Secrets of the Immortals
E6
Sacred Bones
E7
Mysteries of Mars
Season 4
E1
Mysterious Ancient Ruins
E2
The Mystery of Genius
E3
What Lies Below?
E4
Secrets of Abandoned Places
E5
Acts of God
E6
Serial Killer Creatures
E7
Mysterious Tombs
E8
Uncanny Curses
E9
Superhuman Feats
E10
Mysteries of the Missing Link
E11
Surviving the Impossible
E12
The Search For King Arthur
E13
Wonders of the Ancient World
E14
The Hunt For Jack The Ripper
E15
The Search for Extraterrestrial Life
E16
Real Life Monsters
E17
America's Lost Treasures
E18
The Bermuda Triangle and the Beyond
E19
Secrets of the Founding Fathers
E20
The Weird Wild West
E21
Devastating Disasters
E22
Mysterious Monoliths
Season 5
E1
Lost Cities
E2
Tales of the Dearly Departed
E3
Curses Unleashed
E4
Earth's Unsolved Mysteries
E5
The Power of Prophecy
E6
Mysterious Monsters
E7
Sacred Rituals
E8
UFO Hotspots
E9
Extraordinary Structures
E10
Holy Relics
Season 6
E1
The World Beneath Our Feet
E2
The Time Travelers
E3
Secrets of Ancient Structures
E4
Mysteries of the Vikings
E5
Strange Stories of the Presidents
E6
Bizarre Afflictions
E7
Strange Technology
E8
Unbreakable Codes
E9
Strange Stories of World War II
E10
Monsters Among Us
Season 7
E1
The Golden Age of Pirates
E2
Impossible Ancient Inventions
E3
The Lost
E4
Alien Contagion
E5
Ancient Bible Relics
E6
Islands of the Damned
E7
Tales From Antarctica
E8
Robot Revolution
E9
Secret Societies
E10
Secrets of the Spies
E11
Secrets of the Civil War
E12
Mysterious Urban Legends
E13
Mad Scientists
E14
Strange Tales from the American Frontier
E15
Terrors of the Deep
E16
Unlocking the Sixth Sense
E17
The World's Deadliest Assassins
E18
Mysteries of the Underground
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