I'm a severe claustrophobe. After getting trapped in a slide in my local McDonald's at five years old, I swore off all tight and dark spaces forever. So it's not entirely surprising that I couldn't ...

Inside the world’s deepest cave, 7,000 feet below the surface, a sudden flood turns an epic expedition into a desperate fight ...

Beneath the Earth’s surface lies a world so extreme and isolated that it seems more like an alien planet than part of our own ...