Video: 'Chernobyl Disaster 1986: What really happened?'

(Saturday, April 26, 1986, 1:23:45 a.m. MSK; during the Cold War) — The world’s worst nuclear accident occurred this morning at the Chernobyl Nuclear Power Plant in the town of Pripyat, Ukraine (then part of the Soviet Union), killing at least 30 Soviets immediately.

Video: 'Chernobyl Nuclear Disaster: News Report From April 28, 1986'

Video: 'ABC News Nightline: Chernobyl Accident - 04/28/86'

Video: 'Chernobyl Nuclear Explosion Disaster Explained (Hour by Hour)'

An explosion and fire in the No. 4 reactor released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe, forcing hundreds of thousands from their homes in the most heavily hit areas.

Video: 'The Chernobyl Disaster: How It Happened'