Beneath an unassuming town in Missouri is the world's largest subterranean lake. 457,000 square feet of diving await along ...

(This program is no longer available for streaming.) Follow a fearless team of scientists as they venture into blue holes—underwater caves that formed during the last ice age, when sea level ...

Once upon a time, shallow, rock-strewn barreling waves belonged to bodyboarders. Slabs like Ours, the Box and the Cave were ...