Follow the history of the combatants last line of defense, from the armor od medieval knights to the latest revolutionary invention: Dragon Skin. Find out how a priest invented the first bullet-proof vest, and how a pizza boy came up with the concealable body armor.

Carrying nuclear missiles of unimaginable destructive power, torpedoes capable of wiping out entire fleets, and special forces for clandestine missions, today's subs are the ultimate marine warfare package. We trace the submarine's ancestry from the first submersibles to today's Virginia-Class attack submarines.