The Chernobyl nuclear disaster in 1986 was a result of flawed reactor design that was operated with inadequately trained personnel. It was a direct consequence of Cold War isolation and the resulting lack of any safety culture.
A big thank you to Andrew Leatherbarrow for compiling this story and allowing me post it here. Check out his awesome book- Chernobyl 01:23:40 and follow him on Twitter @Leatherbarrow and Instagram @andrewleatherbarrow