Outline of the Chernobyl disaster
The following outline provides an overview of and topical guide to the Chernobyl disaster, a nuclear accident that occurred on 26 April 1986, when the no. 4 reactor of the Chernobyl Nuclear Power Plant, located near Pripyat, Ukrainian SSR, Soviet Union (now Ukraine), exploded during a test.
Source: Wikipedia — Outline of the Chernobyl disaster (CC BY-SA 4.0)