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50 km from downtown Astrakhan to create reservoirs for natural gas storage. Because of the detonation depth (975 to 1,100 meters) and relatively low yield (3.2 to 13.5 kilotons), no radiation was released to the environment. These blasts had lower yields than the Project Sapphire blasts, which were 40 km south-southwest of Orenburg, to reduce any possible seismic destruction to nearby towns in the Volga delta including Astrakhan. At that time, the natural gas fields

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