The death of Floyd Collins one century ago is being remembered as a catalyst for the formation of Mammoth Cave National Park, ...

More is known about the terrain of Mars than about what lies hidden beneath the Earth’s surface. Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet.

From a protected cove on Long Island, Dean’s Blue Hole—Earth’s deepest known underwater cave—plunges more than 600 feet into darkness. The entry to South Passage is decorated by ...

Researchers have returned to an underground thermal lake they first came across in 2021 in southern Albania and confirmed it ...

The Burj Khalifa would go 2,722 feet below the surface. The deepest known point in a cave is in Krubera Cave in Georgia. Switzerland's Gotthard Base Tunnel is the deepest railway tunnel.

Now, digital analysis of rock surfaces reveals how other ghosts of the deep past—this time from ... are some of the largest known cave images found in North America and may represent spirits ...