The Chernobyl disaster, which occurred on April 26, 1986, at the Chernobyl Nuclear Power Plant in Ukraine, is considered the worst nuclear disaster in history. The immediate death toll included 2 people

killed by the explosion and 28 more who died from acute radiation sickness. Over the years, the long-term effects of radiation exposure have led to varying estimates of increased cancer mortality, with some sources estimating up to 4,000 deaths among the most exposed populations

The disaster also resulted in the evacuation of approximately 116,000 people from the surrounding areas.