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Despite all of our modern technology and sophistication, there is much that we still don't know about what lies beneath our feet, deep underground. What is at the center of the Earth? Is there really a solid core of heavy metals, or could it be a hollow environment, as many researchers claim? And just how much of mankind's history took place underground? Recent discoveries of ancient underground structures such as the city of Derinkuyu and the Malta Hypogeum suggest that there may be more structures down there, waiting to be re-discovered. If much of our past was subterranean, could our future be as well?

Release Date: 2019-07-19
Seasons: 1 2 3 4 5 6 7
TMDb: 6.5/10
  • Country: US
  • Language: English | Français | Português
  • Runtime: 43

Other episodes for this season

The Greatest Escapes
Episode 1 - The Greatest Escapes
Superhuman Senses
Episode 2 - Superhuman Senses
Mysterious Curses
Episode 3 - Mysterious Curses
The Truth About UFO's
Episode 4 - The Truth About UFO's
The Underground World
Episode 5 - The Underground World
Leading Double Lives
Episode 6 - Leading Double Lives
Mysteries of the Bible
Episode 7 - Mysteries of the Bible
Mysterious Mummies
Episode 8 - Mysterious Mummies
Secrets of America's Monuments
Episode 9 - Secrets of America's Monu...
The Search for Atlantis
Episode 10 - The Search for Atlantis
Extraordinary Engineering
Episode 11 - Extraordinary Engineering
The Power Of Gold
Episode 12 - The Power Of Gold
The Truth About Bigfoot
Episode 13 - The Truth About Bigfoot
Bizarre Vanishings
Episode 14 - Bizarre Vanishings
Serial Killers
Episode 15 - Serial Killers
The Mystery of Plagues
Episode 16 - The Mystery of Plagues
Mysteries of the Moon
Episode 17 - Mysteries of the Moon
Outrageous Robberies
Episode 18 - Outrageous Robberies