Secrets of the Underground
More from this Show
Rob and Stefan are on the hunt for a fabled fortune deep in a cavern in the northern California woods.
01:35
Secrets of the Underground
This Underwater Camera Hunts for Missing Gold
i
Rob and Stefan search for evidence of the rum-running network reportedly built by the 'Purple Gang' under the Detroit River.
02:38
Secrets of the Underground
Searching for Booze Smuggling Tunnels Beneath the Detroit River
i
Rob and Stefan scan the grounds of Nikola Tesla's lab on Long Island with a magnetometer and find some surprising anomolies hidden underground that suggest evidence of tunnels Tesla claimed to have built.
01:53
Secrets of the Underground
Exploring What Lies Beneath Nikola Tesla's Lab
i
Rob and Stefan create a 3D map of the Nea Church in Jerusalem's sub-basement in search of King Herod's long-lost temple treasures.
01:28
Secrets of the Underground
How to Find Long Lost Treasure Under an Ancient Church
i
Secrets of the underground premieres on Valentine's Day!
00:59
Secrets of the Underground
Secrets of the Underground Promo
i
Where did this well known symbol come from?
00:48
Secrets of the Underground
The Origin of the Infinity Symbol
i
In order to further explore a cave in San Antonio, Rob Nelson crawls through incredible tight caverns. Don’t worry though, he’s only a little claustrophobic.
03:55
Secrets of the Underground
Rob Crawls Through Caverns
i
There’s a mysterious underwater rock circle that supposedly has carvings in it.
01:24
Secrets of the Underground
Underwater Stonehenge
i
Rob's gear malfunctioned underwater.
02:00
Secrets of the Underground
How Dangerous was the Lake Michigan Dive?
i
Go with Rob behind the scenes to see where parts of the show are shot!
01:43
Secrets of the Underground
Secrets of the Underground Set Tour
i
Gungywamp was one of Rob’s favorite spots during this season of Secrets of the Underground!
01:13
Secrets of the Underground
Gungywamp May Provide Proof of Europeans in the Americas Before Columbus
i
The Great Serpent Mound is a 1,348-foot-long prehistoric effigy mound in Ohio. Scientists are sure what it’s purpose was.
03:10
Secrets of the Underground
What is Buried Under Serpent Mound?
i
A collection of dinosaur marks can be found near Denver. Some of these markings are believed to be part of a mating ritual that can still be seen in modern bird species.
02:49
Secrets of the Underground
Dinosaurs Left Mating Ritual Marks in Colorado
i
Enormous dinosaurs and teeny birds have a lot more in common than you might think!
01:42
Secrets of the Underground
What do Plovers and Dinosaurs Have in Common?
i
First, scientists like to date the rock in which the fossil is on. Radiometric dating is a technique used to date materials such as rocks or carbon.
01:27
Secrets of the Underground
How Do Palenologists Date Fossils?
i
What is Pi and where did its symbol come from?
00:53
Secrets of the Underground
Where Did Pi Come From?
i
You May Also Like
Rob and Stefan are on the hunt for a fabled fortune deep in a cavern in the northern California woods.
01:35
Secrets of the Underground
This Underwater Camera Hunts for Missing Gold
i
Rob's gear malfunctioned underwater.
02:00
Secrets of the Underground
How Dangerous was the Lake Michigan Dive?
i
The official reports claim that all 57 workers died from Cholera, but something more sinister may have occurred.
03:05
Secrets of the Underground
The Mysterious Disappearance of Train Workers in Pennsylvania
i
First, scientists like to date the rock in which the fossil is on. Radiometric dating is a technique used to date materials such as rocks or carbon.
01:27
Secrets of the Underground
How Do Palenologists Date Fossils?
i
A collection of dinosaur marks can be found near Denver. Some of these markings are believed to be part of a mating ritual that can still be seen in modern bird species.
02:49
Secrets of the Underground
Dinosaurs Left Mating Ritual Marks in Colorado
i
Enormous dinosaurs and teeny birds have a lot more in common than you might think!
01:42
Secrets of the Underground
What do Plovers and Dinosaurs Have in Common?
i
In order to further explore a cave in San Antonio, Rob Nelson crawls through incredible tight caverns. Don’t worry though, he’s only a little claustrophobic.
03:55
Secrets of the Underground
Rob Crawls Through Caverns
i
There’s a mysterious underwater rock circle that supposedly has carvings in it.
01:24
Secrets of the Underground
Underwater Stonehenge
i
What is Pi and where did its symbol come from?
00:53
Secrets of the Underground
Where Did Pi Come From?
i
The cave in central Texas is home to more than 10,000 prehistoric fossils.
02:44
Secrets of the Underground
This Cave in Texas is Full of Ice Age Fossils
i
In this digital exclusive, Rob Nelson shares extra details about his time spent in this cave full of prehistoric fossils.
01:44
Secrets of the Underground
What Was Exploring Friesenhahn Cave Like?
i
Four-leaf clovers have been considered lucky for a LONG time!
01:18
Secrets of the Underground
Why Are Clovers Lucky?
i
A single bill contains dozes of symbols.
01:16
Secrets of the Underground
What Symbols are on American Money?
i
They’re very, very tiny simulations that allow scientists to learn more about the physics of earthquakes.
03:03
Secrets of the Underground
Scientists can Create Mini Earthquakes in a Lab
i
On the Oregon coast there is a natural hole that appears to drain the sea.
03:09
Secrets of the Underground
What is Thor’s Well?
i
Rob loved exploring Thor's Well despite how dangerous and difficult it was.
01:29
Secrets of the Underground
Rob's Favorite Location
i