Chernobyl's horror explosion caused by pressing one, single button
- Posted on April 22, 2026
- By The Daily Star
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- 1 min read
Chernobyl's horror explosion caused by pressing one, single button

On 26 April 1986, a fateful safety test at Chernobyl's Reactor 4 went catastrophically wrong — triggered when one man pressed the AZ-5 fail-safe button, setting off a chain reaction that caused the world's worst nuclear disaster and affected tens of thousands of lives.