Chernobyl: How bad was it?

Not long after midnight on April 26, 1986, the world’s worst nuclear power accident began. Workers were conducting a test at the Chernobyl Nuclear Power Plant in the Ukraine when their operations spun out of control. Unthinkably, the core of the plant’s reactor No. 4 exploded, first blowing off its giant concrete lid, then letting a massive stream of radiation into the air.
Read more: http://news.mit.edu/2019/chernobyl-manual-for-survival-book-0306?source=Snapzu