London's secret history is revealed. Visit the remains of the Roman port in Londinium on the River Thames along with the first bridge spanning it. Explore shipwrecks in the Thames Estuary: the 16th-century armed English Merchantman the Cherabin, the 17th-century warship the London, and the WWII Liberty Ship the SS Richard Montgomery.

Adolf Hitler's plans to dominate the oceans slowly unravel in a series of disastrous battles in World War II. Now it is revealed how the Third Reich's mighty fleet finally sank beneath the waves. Explored are: the German cruiser Admiral Graf Spee under the Atlantic off Uruguay; the German cruiser Blücher at the bottom of Oslofjord, Norway; the British battlecruiser HMS Hood, sunk by the German battleship Bismarck in the Battle of the Denmark Strait; the sunken Bismarck itself; and the German battleship Tirpitz, sunk by British Tallboy bombs off Håkøya Island in northern Norway. All shed new light on Hitler's reign of terror and ultimate demise.