"Between 1949 and the cessation of atomic testing in 1989, 456 explosions were conducted at the STS, including 340 underground (borehole and tunnel) shots and 1

"Between 1949 and the cessation of atomic testing in 1989, 456 explosions were conducted at the STS, including 340 underground (borehole and tunnel) shots and 116 atmospheric (either air-drop or tower shots)." http://en.wikipedia.org/wiki/Semipalatinsk_Test_Site http://en.wikipedia.org/wiki/Semipalatinsk_Test_Site Semipalatinsk hosts three of Kazakhstan's four nuclear reactors. They also have one of the world's biggest uranium deposits.