A remotely operated vehicle exploring a dark limestone cave 385 meters beneath the ocean surface near a remote Japanese ...

In this handout photo provided by the National Institute of Anthropology and History, underwater archaeologist Octavio del Ro takes photos of the remains of a prehistoric human skeleton discovered ...

The deepest caves on Earth are still being studied by scientists. They are unique environments created over millions of years ...

There was a real underground wildlife scene. A groundbreaking survey of previously unexplored caves in Cambodia has yielded 11 species that are new to science, including pit vipers, snails and other ...

Scientists say caves on Mars and icy moons may host microbial life and serve as future habitats for astronauts to be sent to ...