The finish of WWII is generally known-Japan is nuked, making an impression on Japan, yet the world. Counting the Soviet Union.
Stalin, subsequent to finding out about Hiroshima and Nagasaki, chose the USSR expected to accelerate its atomic program. They required an office to make their nukes, one that was isolated from the outside world.
Along these lines, amidst Russia, in the southern Ural mountains, in excess of 1000 miles from Moscow, Mayak was built. With a few reactors, its motivation was to make weapons-grade plutonium. From 1945 to 1948, a huge number of Gulag prisoners were compelled to develop this office. In 1949, the Soviet Union exploded its first nuclear bomb.
Alongside this plant came a city, Chelyabinsk-40, or City 40. The groups of the researchers and specialists lived there, yet no one other than those individuals realized they even lived; City 40 was a concealed city of 100,000 individuals. No one went in or out. The individuals who would not live here were executed.
This thought of a mystery city was stolen from the American atomic venture, alongside the greater part of the data on atomic material science. This implied security was careless; they didn't know better. Specialists didn't wear defensive apparatus, took care of plutonium with exposed hands, and couldn't have cared less about nature.