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Detailed explanation-1: -April 26, 1986, 1:23:58 a.m. The first explosion, to be quickly followed by at least one more, blows the 1,000-ton roof right off the reactor and shoots a fireball high into the night sky.

Detailed explanation-2: -On April 26, 1986, the Number Four RBMK reactor at the nuclear power plant at Chernobyl, Ukraine, went out of control during a test at low-power, leading to an explosion and fire that demolished the reactor building and released large amounts of radiation into the atmosphere.

Detailed explanation-3: -International Chernobyl Disaster Remembrance Day is observed annually on April 26. It is a day that forever remembers the tragic day that The Chernobyl Nuclear Power Plant, officially named the Vladimir Lenin Nuclear Power Plant, experienced a malfunction during a systems test.

Detailed explanation-4: -On April 26, 1986, a sudden surge of power during a reactor systems test destroyed Unit 4 of the nuclear power station at Chernobyl, Ukraine, in the former Soviet Union. The accident and the fire that followed released massive amounts of radioactive material into the environment.