The battleship USS Arizona Memorial in Hawaii's Pearl Harbor is a scientific treasure due to the marine environment that formed around it.

Reliving the Japanese attack on Pearl Harbor Dec. 7, 1941, and the sinking of the battleship USS Arizona.

Exploring the depths of Devils Hole, an underwater cave in Nevada's Ash Meadows National Wildlife Refuge where the rarest fish in the world, the Devils Hole pupfish, lives.

A journey to Arizona's Montezuma Well, home to the origin story of Southwest Native American tribes, and a bizarre mystery that continues to baffle researchers.

A treasure of the National Park Service, Buck Island is home to some of the most spectacular coral reefs in the Caribbean. Join dive teams as they search for shipwrecks, and protect coral from destructive diseases.

A top secret aircraft project known as Sun Tracker crashed into the desert waters of Lake Mead in 1948, but is now open for diving after being discovered decades later.