From 1996 to 2012, a secret joint operation of Kazakh, Russian, and American nuclear scientists and engineers secured the waste plutonium in the tunnels of the mountains.
Dari tahun 1996 sampai 2012, sebuah operasi gabungan rahasia Kazakh, Rusia, ilmuwan nuklir Amerika dan insinyur mengamankan limbah plutonium di terowongan pegunungan.