Behind the walls of a forbidden city, the only thing more dangerous than its secrets is the truth.
Hidden in the heart of Russia, there is a Soviet-era city where thousands of people live and work behind barbed-wire fences monitored by armed guards. It is Ozyorsk (Ozersk), located in the Chelyabinsk Oblast, one of the most polluted places on the planet and home to the largest stockpiles of nuclear material. Its code name: City 40.
Explore how one man's relentless drive and invention of the atomic bomb changed the nature of war forever, led to the deaths of hundreds of thousands of people and unleashed mass hysteria.
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