Secrets of the Underground Season 2: Episode Guide & Ratings

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.

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.

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.

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 & Stefan Burns use cutting-edge technology to 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, 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.

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.

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.