We joined Nate and Ben from the DeepFreedom channel on an epic underground adventure to explore the deepest known pit in the United States. Starting with a 125-foot rappel into a vast cave system, we ...

In this video, we visit a massive cave that holds the deepest pit in America. As we stand at the edge, we drop a rock down to see just how far it falls and listen for the impact. The sheer depth ...

Belize's Great Blue Hole is one of Earth's most mysterious features. Anyone peering into the 125 metre (410ft) deep pit will wonder what secrets and stories lie beneath. Now, scientists have ...

The tiny Chinese drone survived a mission to the bottom of the Mariana Trench - the deepest pit in any of the world's oceans. The high-tech explorer marks a revolution in the world of deep-sea ...