September 29, 1957 –
An explosion at the Chelyabinsk-40 complex, a Soviet nuclear fuel processing plant, irradiated the nearby city of Kyshtym with strontium-90, cesium-137 and plutonium on this date.
This accident releases twice the radioactivity of the Chernobyl incident.
Oops
And so it goes
The Haus of Dcaligari 