Prehistoric animals once roamed — and ruled — planet Earth ... So, what happened to these Ice Age cave bears? Although their cousins walk the earth today, Ursus spelaeus slowly went extinct ...

Cave divers are at the forefront of this research, helping us access some of the deepest and darkest subterranean and water-filled parts of our planet. Take a deep breath ... Understanding more about ...

There is no light deep in the rocky world of caves - but there is an abundance of animals specially adapted to the challenge of life in total darkness. There are caves all over the planet, but only a ...

Follow a fearless team of scientists as they venture into blue holes—underwater caves ... find animals seen nowhere else on Earth, and recover a remarkable record of the planet's climate.

making it a key focus in the search for life beyond Earth. Joshua's team ventured deep to study fluorescent minerals and lifeforms found at depths of hundreds of feet underground in this cave.