The UnXplained
S04E03 What Lies Below?
More than 80% of the Earth's oceans remain unexplored, and in many ways, the underwater world is the final frontier. As new technology allows us to explore oceans and deep lakes more than ever before, what will we find? Will we discover profound secrets about the oceans? Underwater ruins that were lost for thousands of years? Or perhaps something even more extraordinary?
Season 4 Episodes
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Mysterious Ancient Ruins
The Mystery of Genius
What Lies Below?
Secrets of Abandoned Places
Acts of God
Serial Killer Creatures
Mysterious Tombs
Uncanny Curses
Superhuman Feats
Mysteries of the Missing Link
Surviving the Impossible
The Search For King Arthur
Wonders of the Ancient World
The Hunt For Jack The Ripper
The Search for Extraterrestrial Life
Real Life Monsters
America's Lost Treasures
The Bermuda Triangle and the Beyond
Secrets of the Founding Fathers
The Weird Wild West
Devastating Disasters
Mysterious Monoliths