Lake Karachay, known to be the most polluted lake on the planet, lies south of Siberia and east of the Ural Mountains in Russia. Used as a reservoir for nuclear waste from the Mayak atomic weapons complex, its toxic waters are now mostly covered in concrete. Scientist who visited Lake Karachay in 1990 measured the radiation on the shore and the needles of their Geiger counters determined that a lethal dose would be received in only one hour. The radioactive fallout of three nuclear disasters read more...