On this day in 1986, the world’s worst nuclear disaster: 4th reactor at Chernobyl nuclear power station in USSR exploded. This is the only known photo taken of reactor number 4 on the day of the explosion. GalleryOn this day in 1986, the world’s worst nuclear disaster: 4th reactor at Chernobyl nuclear power station in USSR exploded. This is the only known photo taken of reactor number 4 on the day of the explosion.
