Lake Karachay Is So Radioactive, It Will Kill You In 5 Minutes
120 million curies of radioactive cesium-137
During the 1950′s the Soviet Union started using Lake Karachay to dump waste from Mayak, a nearby nuclear waste storage and reprocessing facility built in 1945-48, in a great hurry and in total secrecy, as part of the Soviet Union’s nuclear weapon program. There are literally uncounted numbers of radioactively contaminated lakes and rivers near to the plant.
According to some sources, the act of standing on the shore of Lake Karachay for only a few minutes will deliver a lethal exposure of radiation, although it will take some time for you to die. Swimming is out of the question.