Professional diver Andrew Ryzebol tells PEOPLE exclusively of his risky underwater explorations 200 feet beneath uncharted ice with nothing ... I bet you can't touch the bottom,'" he remembers.

A team of archeologists in South Africa had to climb to new heights to find an important set of tools made by humans about 20 ...

He’s wearing a white helmet with his name and “Cave Rescue” printed ... Hood’s northwest side. You can see it from Portland, Oregon, a wedge of snow and ice between two broken ridgelines ...

"I go through periods of time where I specifically train just to try and see ... can picture what that looks [like] underneath. So, as we're hiking out on the ice, we're looking at how things ...