well the minimum fission rods for health and safety rules were 22 and only 8 got used the staff went ahead of it regardless of the warnings of other people reactor 4 was going to be shut down in a few days though so they were testing it one more time but they cut off the steam causing the reactor to overheat and breach the roof exposing the uranium to the outside air emitting radioactive gas into the atmosphere but the major explosion was when the rest of the uranium hit the cooling water, those brave firefighters should be remembered 100s sacrificed there lives by going inside unprotected to put the fire out

i agree Chernobyl isnt the worst disaster but it had more of an impact on a global stanzas