26 April 1986

The Chernobyl disaster occurs in the Ukrainian Soviet Socialist Republic.

The Chernobyl disaster was a catastrophic nuclear accident that occurred on April 26, 1986, at the Chernobyl Nuclear Power Plant in the Ukrainian SSR, which was then part of the Soviet Union. The accident occurred during a late-night safety test of one of the plant’s reactors, when a sudden power surge caused a massive explosion and fire that released a huge amount of radioactive material into the air.

The explosion and resulting fire killed two plant workers on the night of the accident, and another 29 people died from acute radiation sickness in the following weeks. The disaster also contaminated large areas of land and water with radioactive fallout, forcing the evacuation of over 100,000 people and causing long-term health effects for many more.

The Chernobyl disaster is considered to be the worst nuclear accident in history, both in terms of the immediate human impact and the long-term environmental and health consequences. It led to significant changes in nuclear safety practices and regulations around the world