Add Yahoo as a preferred source to see more of our stories on Google. There's something about caves that set all of my alarm bells ringing. Tight spaces, true darkness, and no real idea of what ...

Saskia Mulder in a scene from the terrifying British horror movie The Descent. (Pathé/Alamy) Spelunking sounds like a fun hobby, right up until you learn what it means. While the word itself has ...