Fed by a yet-to-be-located underground river, the cave's subterranean lake is thought to be 200 feet deep in spots. Even more interesting are the bones of prehistoric animals that lie scattered at ...

Local porters ferry the expedition team’s equipment across an underground river to reach various chambers within the cave system. Author Neil Shea squeezes through a passage to enter a ...

A second, related new species was found in an underground river that feeds into a cave from a river on the surface, ...

To enjoy the caves safely and comfortably, wear shoes with nonskid soles and take a jacket. Complete your underground trips with a river trip or a walk on the River Styx Spring Trail. The least ...

The Sistema Sac Actun is the world’s longest underground river system, stretching an incredible 95 miles. This epic network of submerged caves and winding tunnels, discovered to be connected in ...

which manages the nearly 300-acre Camuy River Cave Park. Highlights of the tour include the largest stalagmite in Puerto Rico, glimpses of the underground river (and maybe some bats), and a 450 ...

Hidden River Cave will soon commemorate an incident that occurred nearly 100 years ago, which impacted the local area for years to come. On January 30, 1925, cave explorer Floyd Collins became trapped ...

A vast cavern is taking shape beneath a major Toronto intersection as part of the push to build the new $27 billion Ontario Line. The new transit ...

Register for 2025 now at tours@newscientist.com and we will contact you later this year with confirmed tour details. Explore Slovenia's breathtaking underground wonders on a gentle walking tour to ...