A rescue operation is underway to save an expert American caving instructor who fell ill a week ago while more than 3,400 feet deep in a cave.

Mark Dickey had been trapped underground in a cave in Turkey since Aug. 31, when he fell ill more than 3,400 feet below the surface.

A rescue operation has been launched to save American caver Mark Dickey, who is stranded hundreds of meters underground in southern Turkey.

They can be a life-threatening disaster—or a pricey nuisance. Here’s what you need to know about the depressions and holes ...

National park caves all over the nation are a great way to explore cool things underground.