NaN/100 votesLoading...#1 - Capone's Escape Tunnels
Season 1 Episode 1 - Aired 2/14/2017
Rob Nelson investigates rumors of a secret underground escape route used by the infamous gangster Al Capone. In Washington state, Rob tries to uncover who -- or what -- built a vast landscape of earthen mounds in Washington state.
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#2 - Mystery of the Serpent Mound
Season 1 Episode 2 - Aired 2/21/2017
Rob Nelson explores mysterious tunnels beneath Denver's airport and capitol building to investigate rumors of a secret organization operating below. In Ohio, he tries to uncover the ancient secrets of a mound shaped like a serpent.
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#3 - America's Buried Massacre
Season 1 Episode 3 - Aired 2/28/2017
Rob Nelson hunts for a legendary mass grave that could expose a dark secret of America's industrial past. High in the mountains, a giant lake is mysteriously disappearing, and Rob uses cutting-edge technology to find out why.
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#4 - Rocky Mountain Monsters
Season 1 Episode 4 - Aired 3/7/2017
Rob Nelson examines a set of bizarre markings that suggest a violent clash between prehistoric beasts. In California, he investigates if a strange lake is a home to alien life.
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#5 - Great Lakes Bermuda Triangle
Season 1 Episode 5 - Aired 3/14/2017
Rob descends into a cave 30 feet beneath Texas in search of evidence of a mass extinction event. Then, he heads to Lake Michigan to investigate a Bermuda Triangle-like phenomenon that has caused ships to vanish for centuries.
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#6 - California's Hidden Doomsday
Season 1 Episode 6 - Aired 3/21/2017
Rob Nelson heads to California to investigate a network for major fault lines that could set off an unprecedented mega-quake. Then, he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.
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#7 - Secret History of the New World
Season 1 Episode 7 - Aired 3/28/2017
Rob investigates ancient ruins in New England that suggest Europeans arrived in the Americas almost 1,000 years before Columbus. Then, he heads to California where a dormant super-volcano may be showing new signs of life.
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#8 - American Stonehenge
Season 1 Episode 8 - Aired 4/4/2017
Rob Nelson investigates the mysterious pattern of rocks at the bottom of Lake Michigan known as Underwater Stonehenge. At the notorious Alcatraz prison, Rob uses state-of-the-art technology in search of rumored escape tunnels.
Director: N/A
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NaN/100 votesLoading...#9 - Legend of the Nazi Gold
Season 2 Episode 1 - Aired 10/28/2017
A legendary train filled with stolen Nazi gold is said to be hidden in Poland. Using cutting-edge technology, Rob Nelson and Stefan Burns explore deep underneath the earth's surface and in abandoned Nazi tunnels in search for the infamous legend.
Director: N/A
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NaN/100 votesLoading...#10 - King Solomon's Treasures
Season 2 Episode 2 - Aired 11/4/2017
Priceless gold and silver artifacts are believed to be in fabled lost Temple Treasures of Jerusalem & King Solomon's hidden mines. With unprecedented access, Rob Nelson and Stefan Burns use the latest technology to search for the legendary treasure.
Director: N/A
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NaN/100 votesLoading...#11 - Tesla's Final Secrets
Season 2 Episode 3 - Aired 11/11/2017
Nikola Tesla died before finishing a mysterious, earth-shattering invention, but the ground beneath his only remaining lab might hold clues. Rob Nelson & Stefan Burns are the first to use cutting-edge tech to investigate Tesla's underground secrets.
Director: N/A
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NaN/100 votesLoading...#12 - Doomsday Volcano of the Gods
Season 2 Episode 4 - Aired 11/18/2017
A massive supervolcano beneath Naples, Italy may be on the verge of erupting again, which could have apocalyptic consequences across the planet. Rob Nelson and Stefan Burns use cutting-edge technology to investigate this disturbing new evidence.
Director: N/A
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NaN/100 votesLoading...#13 - Atlantis in America
Season 2 Episode 5 - Aired 11/25/2017
New theories claim that the legendary sunken city of Atlantis could have actually been in the Americas. Rob Nelson & Stefan Burns use cutting-edge technology to investigate evidence that might shed more light on one of the world's greatest mysteries.
Director: N/A
Writer: N/A
NaN/100 votesLoading...#14 - Mystery of the Ice Cave
Season 2 Episode 6 - Aired 12/2/2017
A strange cave freezes in the summer and melts in the winter, and a massive sand dune swallows a small child in an instant. Rob Nelson and Stefan Burns use cutting-edge technology to investigate these mysteries of the natural world.
Director: N/A
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NaN/100 votesLoading...#15 - Lost Pirate City Treasure
Season 2 Episode 7 - Aired 12/9/2017
When an infamous pirate city sunk into the sea after a massive earthquake, a pirate's treasure might have disappeared with it. Rob Nelson and Stefan Burns use cutting-edge technology to hunt for the legendary lost pirate treasure of Henry Morgan.
Director: N/A
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#16 - Quest for the Gold Rush Fortune
Season 2 Episode 8 - Aired 12/16/2017
Millions of dollars of stolen Gold Rush treasure is rumored to have been stashed in a cave in Northern California. Rob Nelson and Stefan Burns use cutting-edge technology to search for the legendary treasure.
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The Best Episodes of Secrets of the Underground
Every episode of Secrets of the Underground ranked from best to worst. Let's dive into the Best Episodes of Secrets of the Underground!
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.
Genres:RealityDocumentary
Network:Science
Best Episodes Summary
"Capone's Escape Tunnels" is the best rated episode of "Secrets of the Underground". It scored N/A/10 based on 0 votes. Directed by N/A and written by N/A, it aired on 2/14/2017. This episode scored NaN points higher than the second highest rated, "Mystery of the Serpent Mound".