The show reveals how an ancient destroyer rammed its way to victory in one of the most significant sea battles. In Denmark, a team of divers build and test the world's first ever deep sea diving suit, designed in the 15th century. CSI science helps unravel the mystery of an unknown ship found off the coast of Britain. And in a sea cannon experiment, naval experts explore how a 16th century war fleet blasted their way to victory against the Spanish armada.