No Image

7.8

The UnXplained•Season 7•Episode 18

Mysteries of the Underground

7.8/10 · 21 votesOct 31, 202542 min

Ranked #11 of 18 in Season 7•matches the season avg

Discussion

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?

Previous episodeE17 · The World's Deadliest Assassins Next seasonSeason 8

Seasons8

All 1 2 3 4 5 6 7 8

Season 7 Episodes18

E1 8.1

The Golden Age of Pirates

E2 8.0

Impossible Ancient Inventions

The Lost

Alien Contagion

Ancient Bible Relics

Islands of the Damned

E7 8.0

Tales From Antarctica

Robot Revolution

Secret Societies

Secrets of the Spies

Secrets of the Civil War

E12 7.8

Mysterious Urban Legends

E13 7.7

Mad Scientists

E14 7.9

Strange Tales from the American Frontier

E15 7.7

Terrors of the Deep

E16 7.2

Unlocking the Sixth Sense

No image

E17 7.5

The World's Deadliest Assassins

No image

E18 7.8Now viewing

Mysteries of the Underground

Cast1

William Shatner

Self - Host

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"Mysteries of the Underground" is episode 18 of The UnXplained season 7. It scored 7.8/10 from 21 votes, ranking #11 of 18 episodes this season (season average 7.8). It aired on October 31, 2025.

Continue to Season 8 Best of Season 7