Divers plunging into Mexico's submerged Sac Actun cave system in 2007 stumbled upon a hidden world of Ice Age fossils, ...

Divers in Mexico's Yucatan Peninsula say they have discovered the world's largest underwater cave. Underwater archaeologists discovered last week that the cave system known as Sac Actun, located near ...

Hidden beneath the surface, a pristine underwater cave can preserve traces of vanished worlds with a clarity that dry land rarely matches. In the still water and sealed chambers, sediments, bones, and ...