A high-tech survey reveals the dark secrets of U.S. nuclear tests at Bikini Atoll.

Of all the wrecks lying at the bottom of the Baltic, perhaps the most spectacular is the battleship Mars. Only recently discovered, she is finally ready to give up her secrets.

A legendary ancient Egyptian city, lost beneath the waves for 2,000 years, finally gives up its secrets.

In summer 1940, Great Britain stood alone against the Nazis. Now we uncover the wrecks that reveal the truth behind the Battle of Britain.

Uncovering the long-lost shipwrecks of legendary captains reveals why the Caribbean, more than all other seas, became famous for pirates.

Forgotten wrecks from the American Revolution are discovered. Cutting-edge computer graphics shed new light on the struggle for independence.

Draining American rivers, seas and oceans reveals military tactics from the American Civil War that rewrote the rules of warfare forever.

Hitler's latest weapons sink during a top-secret U-boat mission. An American aviation breakthrough brings victory to the Allies in the Pacific.

Underwater exploration reveals astonishing secrets: terrifying disasters, war-winning heroics and an engineering marvel that saves the city.