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http://en.wikipedia.org/wiki/Nuclear_Explosions_for_the_National_Economy#Problems

Another catastrophe resulted from the Globus-1 explosion near village Galkino, 40 kilometers from Kineshma city on September 19, 1971.[4] It was a very small underground explosion of 2.5 kilotons that was a part of the seismological program for oil and gas exploration. Unexpectedly a large amount of radioactive gases went out through the cracks in the ground, creating a significant highly radioactive spot of two kilometers in diameter in the relatively densely populated area of European Russia. To make things worse, a small tributary of the Volga, the Shacha, changed its location and threatened to flood the very hole of the explosion. This could have led to nuclear pollution of the entire Volga region.

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