In the second episode we witness the demise of the Imperial German fleet – and the rise of Japan as a major power. Against the backdrop of the deadliest war the world has ever seen, we learn how submarines and aircraft carriers change naval tactics forever. The First World War had barely ended when a new one was announced, one also fought on the oceans. WWII features aircraft carriers, battle cruisers, destroyers, submarines. Naval battles play out on surface, underwater and in the air. The era of battleships ended. Aircraft carriers became the new symbols of power on the seas. U-boats come up against Allied destroyers in the Atlantic, who are armed with hedgehogs and depth charges. Nations staked their futures in naval battles. Warships played a role in the outbreak of the Second World War. The end of the war was ultimately sealed on board a warship.

In a moment where a new weapon has potentially made warships irrelevant, they become more important than ever. We are there when nuclear weapons first go to sea, and balance on the knife's edge of mutually assured destruction. With the end of World War II, the future of warships themselves is at stake: The use of atomic bombs calls into question the fundamental utility of warships. Nuclear age brings nuclear powered naval forces: carriers, submarines, frigates. In 1955, first nuclear powered submarine allowed crew to remain underwater forever. Nuclear energy is more than just a weapon: Nuclear-powered ships achieve ranges and speeds like never before. Nuclear-powered submarines can operate almost indefinitely. And remain invisible until they fire their missiles and torpedoes.

In the last episode we venture a glimpse into the future. We see new powers rise – and witness an old power reborn. Finally, we ask ourselves and our characters: In a world where David can take on Goliath, what is the future of warships? The Cold War is over. Only one superpower remains: the United States. As the 21st century arrives, technology takes center stage in marine warfare. Soviet Union has collapsed and US is unchallenged on the seas. Until now, ships fought against ships. But what happens when new enemies break traditional rules? In the age of asymmetric warfare, insurgent groups fight against nations. Terrorism emerges as a new enemy. Technology is the tool against terrorism. New powers rise, old ones are reborn. China is a rising power. Submarine robots and drones offer a glimpse into the future of warships.