Plot synopsis: The very first submarine, which legend claims lurked beneath New York Harbor during the American Revolutionary War. The small ships that rescued thousands from Dunkirk. The destroyer that forced the easing of the Cuban Missile Crisis. Over the centuries, conflicts have prompted advances to ship designs, making vessels stronger, faster, smarter, and capable of changing the course of wars. Join us as we examine the world's greatest Combat Ships, and reveal how they shaped world history and inspired men and women to acts of incredible courage.