They’re very, very tiny simulations that allow scientists to learn more about the physics of earthquakes.

On the Oregon coast there is a natural hole that appears to drain the sea.

Rob loved exploring Thor's Well despite how dangerous and difficult it was.

In order to see fine details underwater, scientists use special tech.

Over the past five thousand years, shorelines have been completely reworked.

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.

Near Fresno, California, there are alarming signs of possible volcanic activity.

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?

Rob Nelson and the Secrets of the Underground crew stayed after hours to capture footage at this infamous prison.

Gungywamp was one of Rob’s favorite spots during this season of Secrets of the Underground!

Secrets of the underground premieres on Valentine's Day!

Bizarre behavior, strange nature and unexplained sights. When caught on CCTV they allow scientists to study them and get to an explanation.

Thought statistically impossible, it's caught on tape. It's this type of thing that drives experts like David Wallace to keep using science to solve mysteries.

Southeast of Mexico City, hundreds goats are found dead and completely drained of blood. Is this the work of the legendary chupacabra?

A fireball in the sky over Sri Lanka in 2012 is followed days later by a mysterious downpour of red rain. During the search for a rational explanation, investigators find evidence of strange living cells with no earthly comparison.

On March 24, 1967, men see an unidentified object hovering over Montana’s Malmstrom Air Force Base, home to nuclear weapons, which are all disabled simultaneously.