The uranium reactors at Chernobyl in Ukraine, site of the world’s worst nuclear accident in April 1986 and occupied by Russian forces since just after the invasion began on February 24th have been cut off from the electric grid, which is very bad because without power the facility cannot cool down the spent fuel remaining at the site, Reuters reports. Ukrainian nuclear authority Energoatom said that without power to cool them down, the 20,000 spent fuel assemblies at the site could heat up and cause “the release of radioactive substances into the environment. The radioactive cloud could be carried by wind to other regions of Ukraine, Belarus, Russia, and Europe.”