In the 1980s, the Institute of Physics of the Earth (IPE) in Moscow was challenged by the Soviet Academy of Sciences with an ambitious task to become the Soviet representative in an unprecedented joint project with the United States of America in a defense‐sensitive area. In 1986–1988, a series of experiments was held on two major nuclear test sites, in Nevada in the United States and Semipalatinsk in Kazakhstan, to prove the scientific possibility of verifying the exact location and yield of underground nuclear explosions. The story hardly sounds sensational; however, there are reasons to believe that it stands out...

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