The Chernobyl disaster occurred in 1986. Specifically, the catastrophic nuclear accident took place on April 26, 1986, at the Chernobyl Nuclear Power Plant in Ukraine, which was then part of the Soviet Union. The explosion and subsequent fire released large quantities of radioactive particles into the atmosphere, leading to widespread contamination and health effects. It is considered one of the worst nuclear disasters in history, resulting in evacuation and resettlement of thousands of people. The incident has had a lasting impact on nuclear energy policies and public perception while also leading to significant advances in reactor safety protocols.