UNDERWORLDS OF KALININGRAD

Russian nuclear missiles threaten Europe from Kaliningrad, while Königsberg's German fortresses and bunkers still lie hidden underground in the Russian exclave. Diggers explore these secret locations that were once part of East Prussia's magnificent royal city, which experienced fierce fighting in 1945 and whose Amber Room was hidden in the castle cellar. Stalin renamed the destroyed city. Today, high-tech researchers are uncovering the buried Prussian underground buildings, searching for the legendary Amber Room and marvelling at German engineering skills, while Artur unveils his vision of the old Königsberg.