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Where did this well known symbol come from?
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Secrets of the Underground
The Origin of the Infinity Symbol
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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.
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Secrets of the Underground
Rob Crawls Through Caverns
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There’s a mysterious underwater rock circle that supposedly has carvings in it.
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Secrets of the Underground
Underwater Stonehenge
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Rob's gear malfunctioned underwater.
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Secrets of the Underground
How Dangerous was the Lake Michigan Dive?
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Go with Rob behind the scenes to see where parts of the show are shot!
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Secrets of the Underground
Secrets of the Underground Set Tour
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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
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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?
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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
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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?
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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?
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What is Pi and where did its symbol come from?
00:53
Secrets of the Underground
Where Did Pi Come From?
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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
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A single bill contains dozes of symbols.
01:16
Secrets of the Underground
What Symbols are on American Money?
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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
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Funny enough, these symbols were used to classify plants before classifying humans and animals.
00:54
Secrets of the Underground
Where Did the Female and Male Symbols Originate?
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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?
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They’re very, very tiny simulations that allow scientists to learn more about the physics of earthquakes.
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Secrets of the Underground
Scientists can Create Mini Earthquakes in a Lab
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On the Oregon coast there is a natural hole that appears to drain the sea.
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Secrets of the Underground
What is Thor’s Well?
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Rob loved exploring Thor's Well despite how dangerous and difficult it was.
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Secrets of the Underground
Rob's Favorite Location
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In order to see fine details underwater, scientists use special tech.
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Secrets of the Underground
How Do Scientists Scan Underwater?
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Over the past five thousand years, shorelines have been completely reworked.
01:28
Secrets of the Underground
How Have Lake Levels Changed?
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Supervolcanoes occur when magma in the mantle rises into the crust but is unable to break through it and pressure builds in a large and growing magma pool until the crust is unable to contain the pressure.
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Secrets of the Underground
This Popular Tourist Spot Sits Atop a Supervolcano
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Near Fresno, California, there are alarming signs of possible volcanic activity.
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Secrets of the Underground
A Supervolcano Could Be Waking Up in California
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Out of all the places that Rob visited during the filming of Secrets of the Underground, which one does he think people should definitely visit?
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Secrets of the Underground
Rob’s Go-To Spot
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Rob Nelson and the Secrets of the Underground crew stayed after hours to capture footage at this infamous prison.
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Secrets of the Underground
What Was It Like Shooting At Alcatraz After Dark?
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Gungywamp was one of Rob’s favorite spots during this season of Secrets of the Underground!
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Secrets of the Underground
Gungywamp May Provide Proof of Europeans in the Americas Before Columbus
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Secrets of the underground premieres on Valentine's Day!
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Secrets of the Underground
Secrets of the Underground Promo
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Get ready for the new Science Channel series, Hacking the Wild!
00:30
Hacking the Wild
Andy Quitmeyer is Hacking the Wild
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Using just a simple hand drill and a large stick, Andy was able to make a clothes dryer!
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Hacking the Wild
How to Hack the Wild: Clothes Dryer
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You get start a fire using the acidity from a pineapple!
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Hacking the Wild
How to Hack the Wild: Pineapple Fire Starter
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Andy needs fresh water, so he looks to a laptop screen and old snail shells to help him fight dehydration.
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Hacking the Wild
Using a Laptop Screen and Snail Shells to Distill Water
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01:04
Hacking the Wild
How to Hack the Wild: Arrow Camera
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