Entering the cave is completely prohibited from being near ‘Chelyabinsk-40′ nuclear complex, also known as ‘Mayak’ (’Lighthouse’), where on September 29 1957 an explosion of nitrate and dry acetate occurred in a deposit of highly radioactive waste and produced a release of 20 million Curies of radioactivity into the atmosphere. The explosion was caused by a failure of the cooling system of the tank.
Over the past 45 years, about half a million people in the region have suffered the consequences of the incident, exposing them to up to 20 times the radiation suffered by the victims of Chernobyl.
