(the secret city at the heart of the test range named for Igor Kurchatov, father of the Soviet atomic bomb) was home to many of the brightest stars of Soviet weapons science. The Soviet Union operated the Semipalatinsk Test Site (STS) from the first explosion in 1949 until 1989; 456 nuclear tests, including 340 underground and 116 atmospheric tests, took place there.

Some land around Semey has suffered environmental