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Rob and Stefan are on the hunt for a fabled fortune deep in a cavern in the northern California woods.
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01:35
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This Underwater Camera Hunts for Missing Gold
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Rob and Stefan search for evidence of the rum-running network reportedly built by the 'Purple Gang' under the Detroit River.
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Searching for Booze Smuggling Tunnels Beneath the Detroit River
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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.
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Exploring What Lies Beneath Nikola Tesla's Lab
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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.
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How to Find Long Lost Treasure Under an Ancient Church
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Secrets of the underground premieres on Valentine's Day!
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00:59
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Secrets of the Underground Promo
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Where did this well known symbol come from?
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00:48
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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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03:55
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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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01:24
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Underwater Stonehenge
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Rob's gear malfunctioned underwater.
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02:00
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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 Set Tour
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Gungywamp was one of Rob’s favorite spots during this season of Secrets of the Underground!
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01:13
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Secrets of the Underground
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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.
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03:10
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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.
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02:49
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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!
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01:42
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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.
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How Do Palenologists Date Fossils?
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What is Pi and where did its symbol come from?
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The cave in central Texas is home to more than 10,000 prehistoric fossils.
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This Cave in Texas is Full of Ice Age Fossils
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In this digital exclusive, Rob Nelson shares extra details about his time spent in this cave full of prehistoric fossils.
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What Was Exploring Friesenhahn Cave Like?
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Four-leaf clovers have been considered lucky for a LONG time!
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Why Are Clovers Lucky?
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A single bill contains dozes of symbols.
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01:16
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What Symbols are on American Money?
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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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03:03
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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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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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Rob's Favorite Location
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