What happened in Chelyabinsk-40?
Building of a secret nuclear facility
A nuclear testing accident
A massive labor strike
The signing of a peace treaty
Answer
Chelyabinsk-40 was a secret Soviet nuclear test site, located near the town of Ozyorsk in the Chelyabinsk Oblast. In 1957, a nuclear test accident occurred at Chelyabinsk-40, resulting in the release of radioactive material into the atmosphere. The accident was not publicly acknowledged by the Soviet government until 1990.
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