From conquering the oceans' depths to defending the freedoms of the seas, ancient man pushed the technological boundaries to the limits in the mega battle for the oceans. New discoveries will reveal how an ancient destroyer rammed its way to victory in one of the most significant battles in human history. In Denmark, a team of divers builds and tests the world's first-ever deep-sea diving suit designed 350 years before the history books tell us it was possible to walk along the seabed. Can CSI science unravel the mystery of a time-traveling ghost ship? And in a groundbreaking sea cannon experiment, naval experts will discover how a 16th-century war fleet blasted their way to victory against an enemy armada seven miles wide, without the loss of a single ship.