1:23AM.
Reactor 4 at the Chernobyl Nuclear Power Plant explodes, launching a plume of radioactive dust and smoke into the air.
It takes a day before the surrounding area is evacuated. Helicopters are called in from as far as Siberia and East Germany to dump cobalt and sand onto the reactor, costing the lives of several pilots.
Men are sent in to clean up the radioactive material often wearing nothing but a dust mask. Certain areas measured thousands of roentgens per hour.
The death toll is still unknown. May this day in history never be forgotten.