Firefighters on the burning turbine-hall roof
In the first hours after the reactor explosion on 26 April 1986, fire crews under Lieutenants Volodymyr Pravyk and Viktor Kibenok climbed onto the roofs of the reactor building and turbine hall to put out fires. They had no usable information about radiation levels, and the instruments on hand went off-scale. They stopped the fire from spreading to the neighbouring unit, but many received fatal doses and died within weeks in a Moscow hospital. The case shows how an emergency response built for conventional fire sends its most committed responders into a hazard they have no means of perceiving.