But Dark Star, with so many areas still to survey ... Mark Synnott inches his way through a narrow tunnel in the cave system. Watch him navigate the shaft. Just inside the entrance, Tonya ...

Ban Tham Cave in Son La is the only mountain tunnel road in Northwest Vietnam, offering a thrilling off-road experience through a dark, rocky passage. A must-visit for adventure seekers! Ban Tham Cave ...

Decidedly unremarkable from the top, that open door actually leads to something surprising and seemingly impossible: a hand-carved tunnel beaten into a rocky California bluff that leads to a cave ...

A team of explorers rappelled into the shaft-like cave and found a “pinkish” animal living in a cold river of the “deep dark zone.” Take a look.