The Tokyo District Court is ordering a partial halt to the construction of an underground tunnel, which caused a large sinkhole to form in Chofu city, because it poses a danger to nearby residents.

Researchers have found a "unique" collection of "cave pearls"—some of which contain archaeological artifacts—in an ancient tunnel, a study has reported. Cave pearls are a type of "speleothem ...

A team of archaeologists announced the discovery of a hidden Inca tunnel network that puzzled scientists for centuries in ...

Researchers from the Hebrew University of Jerusalem uncovered rare cave pearls containing man-made objects within an ancient subterranean water system near Jerusalem. Their findings were recently ...