The Catastrophic Price of a Safety Test

The world's worst nuclear disaster actually began as a simple safety test. Engineers were trying to simulate a blackout to improve emergency cooling, but a hidden design flaw triggered a massive, uncontrollable power surge.

During the 1986 experiment, the reactor became unstable and ultimately exploded after operators struggled to shut it down. The disaster resulted in costs estimated at 700 billion dollars and forced the evacuation of over 100,000 people. Remarkably, the Soviet government only acknowledged the event after radiation sensors in Sweden detected the fallout. This event remains the most expensive and damaging industrial accident in human history.