Secrets of the Underground - Episode Guide

Investigating rumors of a secret underground escape route used by the infamous gangster Al Capone; trying to uncover who or what built a vast landscape of earthen mounds in Washington state.

Exploring mysterious tunnels beneath Denver's airport, capitol building and downtown to investigate rumors of a secret organization that operates below; in Ohio, trying to uncover the ancient secrets of a giant mound shaped like a serpent.

Hunting for a legendary mass grave that could expose a dark secret of America's industrial past; using cutting-edge technology to find out why a giant lake is mysteriously disappearing high in the mountains.

Examining a set of bizarre markings that suggest a violent clash between prehistoric beasts; in California, Rob investigates to see if a strange lake is a home to alien life.

Descending into a cave 30 feet beneath Texas in search of evidence of a mass extinction event; heading to Lake Michigan to investigate an unexplained, Bermuda Triangle-like phenomenon that has caused ships to disappear for centuries.

Heading to California to investigate a network for major fault lines that could set off an unprecedented mega-quake; he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.

Investigating a cluster of ancient ruins in New England that suggest Europeans arrived in the Americas almost 1,000 years before Columbus; heading to California where a dormant super volcano may be showing new signs of life.

Investigating 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.

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 of the infamous legend.

Priceless gold and silver artifacts are believed to be in fabled lost Temple Treasures of Jerusalem and King Solomon's hidden mines; with unprecedented access, Rob Nelson and Stefan Burns use the latest technology to search for the legendary treasure.

Nikola Tesla died before he finished a mysterious invention, but the ground beneath his only remaining lab might hold clues; Rob Nelson and Stefan Burns are the first to use cutting-edge tech to investigate Tesla's underground secrets.

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.

New theories claim that the legendary sunken city of Atlantis could have actually been in the Americas; Rob Nelson and Stefan Burns investigate evidence that might shed more light on one of the world's greatest mysteries.

A strange cave freezes in the summer and melts in the winter; a massive sand dune swallows a small child in an instant.

When an infamous pirate city, Port Royal, Jamaica, sunk into the sea after a massive earthquake, a wealthy pirate's treasure may have disappeared with it; a hunt for the legendary lost pirate treasure of Henry Morgan.

Millions of dollars of stolen Gold Rush treasure is rumored to have been stashed in a cave in Northern California; the search for the legendary treasure.