The Chernobyl elephant's foot was a highly radioactive lava-like mass that burned through several floors of the Chernobyl nuclear power plant starting in April 1986. It reached temperatures of roughly 3000 degrees Fahrenheit (1600 degrees Celsius) until it finally reached the basement and cooled down and solidified. In December of the same year members of the clean-up crew discovered an offshoot of the mass which is now called the elephant's foot. It was extremely radioactive, enough that if you stood next to it when it first formed the radiation could have killed you in roughly five minutes.
source: chemistry world













