Science & EnvironmentConfirmed
The Chernobyl 1986 Soviet Cover-Up
At 1:23 AM on April 26, 1986, Reactor No. 4 at the Chernobyl Nuclear Power Plant in Pripyat, Ukrainian SSR, exploded during a safety test. Soviet authorities delayed public acknowledgment for approximately 36 hours; evacuation of Pripyat (population approximately 50,000) began 36 hours after the explosion. International detection came not from Soviet disclosure but from the Swedish Forsmark Nuclear Power Plant, where workers on April 28 triggered radiation alarms that were traced to contamination coming from the USSR. The cover-up is confirmed through post-Soviet declassification of Politburo transcripts and KGB documents, IAEA investigations, and the memoirs of Valeri Legasov, the chief Soviet scientist on the disaster response team. Legasov died by suicide in April 1988 after making public his criticisms of Soviet nuclear safety culture.