Next year marks the 100th anniversary of Titanic. For much of this past century, the world's most famous ship was lost to a watery grave. But tragedy turned to triumph in 1985, when the wreck was discovered 12,000 feet beneath the icy surface of the Atlantic. 

Technology has unlocked earth’s last frontier to adventurers, scientists, and treasure hunters. Shipwrecks and lost cities await, promising a wealth of knowledge about ancient civilizations, and other untold riches. But sites once protected by the ocean depths are now falling victim to plunder. We are in a race to the relics on the ocean floor --- against the elements and each other --- but what will be the fate of underwater cultural heritage?