How did the chernobyl plant stop?

The Chernobyl disaster occurred on April 26, 1986, when a reactor at the plant experienced a catastrophic failure during a safety test. The reactor's design flaws and operator errors led to an uncontrollable power surge, resulting in explosions and the release of radioactive materials. The plant was ultimately stopped by manually shutting down the reactor and using a combination of water and sand to extinguish the fires and contain the release of radiation. The reactor was later encased in a concrete sarcophagus to prevent further contamination.