Scientists say the sinkholes in Lake Michigan, ranging from 300 to 600 feet across, formed as water dissolved limestone bedrock, causing surface collapse. Groundwater erosion creates caverns ...

A cenote is a natural pit formed by the collapse of limestone bedrock which created a little underground cavern complete with freshwater pool. The more daring of those on the trip took to ...

Cavern Diving is the exploration of underwater ... “cenotes,” which are natural sinkholes resulting from the collapse of limestone bedrock that exposes groundwater underneath.

Find Gypsum Cave stock video, 4K footage, and other HD footage from iStock. Get higher quality Gypsum Cave content, for less—All of our 4K video clips are the same price as HD. Video Back Videos home ...

A member of the Iranian Caving and Speleology Association confirmed the discovery of this limestone cave in Barzok by a local resident. The cave features multiple chambers and passageways and ...

Cave explorers have pushed through narrow gaps in rocky walls to uncover an extra 100 metres of tunnel on South Australia's Limestone Coast, with hopes it may link separate caves together.

UENO, Gunma Prefecture--The Fujido limestone cave, which burrows for around 2.2 kilometers and is one of the largest in the Kanto region, has reopened featuring alternating LED lighting.

NPCA shares the latest archaeological discovery at Mammoth Cave National Park, which has a pretty fascinating human history, too.

Gabriel Oluwasegun Olanrewaju, a professional boxer from Nigeria, died suddenly over the weekend after he collapsed in the third round of a light-heavyweight fight in Ghana, according to officials ...