After that, work moved quickly: with the poisonous maw of the reactor finally covered, the Sredmash teams installed a ventilation system to stabilize the atmosphere inside the Sarcophagus and connected a network of radiation- and temperature-monitoring devices to a freshly decontaminated room nearby filled with computer equipment. There was still no sign of the missing 180 tonnes of uranium from the reactor core, and Academician Legasov and the other scientists remained concerned about the possibility of a new chain reaction. So inside the new structure the Sredmash engineers also installed a
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