A homeowner noticed something strange on his property, then uncovered a deep cave hidden beneath the ground. What started as curiosity quickly turned into a serious exploration, with darkness, drops, ...

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 inside a river cave, a massive waterfall drops nearly 280 feet into complete darkness. Reaching the bottom required a ...