In the second episode, Will Smith descends 3,300 feet to the bottom of the ocean in a deep-water submersible, where even fewer people have gone than outer space. Along the way down, Will and explorer Diva Amon investigate how colour is used in the natural world and the role of bioluminescence. In the oceans, nearly 80 percent of animals use bioluminescence in some way, possibly the most common form of communication on the planet.

In 1940, France has fallen and Hitler orders Operation Sealion, the invasion of Great Britain. But first the Luftwaffe must defeat the RAF for seaborne landings to succeed. In July 1940 an epic struggle in the skies above England begins. Only a brilliant defensive system and the bravery of young pilots stand in the Luftwaffe’s way. Wave after wave of German bombers are attacked by British planes. Featuring the last interview with the youngest Spitfire-pilot in the battle, Geoffrey Wellum.

When Japan’s military expansion in the Pacific reaches its fever pitch, Roosevelt is forced to act. By cutting off oil supplies, he hopes to force Japan to back down. But far from sedating their imperial expansions, he pushes them to take one of the greatest gambles in military history – taking their entire striking fleet 4000 miles across the Ocean to attack the American Pacific fleet in Pearl Harbor. It’s a huge gamble, and if it goes wrong, it will spell suicide for Japan.

For the past century, Russian history has also been the history of its security services. They were used by the Soviet state to crush dissent. Millions suffered at their hands. Mass executions, secret wars, spies capable of stealing the atomic bomb, poisoning scandals all add up to the most extraordinary and dangerous security network the world has ever known. But even today, the security network is arguably stronger than ever. This is the History of the KGB, told through its veterans and its victims.
Founded in 1917, Cheka was the predecessor organization of the KGB. Set up as a 'temporary' measure by Lenin, unknown number of Soviet citizens would die at the hands of the secret services as internal dissents in the 1920s. An inglorious chapter is the "Great Terror" phase, when millions of Soviet citizens were convicted and executed in mock trials under Stalin's rule in the 1930s. Outside the Soviet Union, during the WWII they were busy infiltrating German High Command, British Intelligence and America's Manhattan Project. The Cold War had begun in earnest.

In the aftermath of Japan’s devastating attack on the US Pacific fleet at Pearl Harbor, the Japanese Imperial Navy moves in for a knockout blow. A surprise attack against the island of Midway is planned to draw the remaining American aircraft carriers out for a decisive battle. Admiral Yamamoto devises a meticulous plan. But the attack is in the hands of his by-the-book Admiral, Nogumo. When a genius American code-breaker unearths their plans – the Japanese attack is thrown into chaos.

By August 1949 the USSR became the world's second superpower, thanks to its spies who had stolen America's atomic secrets. But by March 1953, Stalin is dead and KGB chief, Beria, is executed later the same year. Nikita Kruschev tries to reduce the power of the security service, splitting it into several sections...but it doesn't last and, soon, the KGB is back.
In the USSR, countless KGB operatives spied on opponents of the regime at home, guarded the state and party leadership, and abroad tried to find out as much as possible about the intentions of the NATO countries and, if possible, to sabotage them.