Deep inside the cave system, explorers encountered a vertical pit plunging more than 600 feet into darkness. The depth, scale ...

The Hranicka Abyss is at least 1,325 feet deep, and likely goes down further. — -- A team of explorers believe they have discovered the deepest known underwater cavern the world in eastern Czech ...

Deep underground, flowing water leads explorers into a cave shaped by constant motion and time. The waterfall inside Nash Cave reveals narrow passages, slick rock, and areas rarely documented.