What on Earth? Season 6 Episode 5 - The Cave to Hell

Airdate: 2019-Jul-11

Episode summary:

When a sinister cave is discovered in a remote corner of Iceland, experts uncover a secret underworld tunneling to unknown depths, and using cutting-edge tech, they investigate if this strange place could hold secrets of alien worlds.

About What on Earth? series:

What on Earth? is a documentary series using satellite images of strange geological occurrences and man-made structures on Earth to examine such ma...Show more >