Explore the hidden history of City 40, now known as Ozersk, a closed city in Russia created by the Soviet Union during the Cold War. Discover how it remained off the maps and out of the public eye until 1991, and how a courageous documentary crew managed to uncover the city's secrets. Delve into the fascinating and eerie world of Ozersk, where no outsiders were allowed in, and the residents couldn't leave. This episode sheds light on an obscure chapter of Cold War history that has only recently become known to the Western world.