What is the function of this colossal structure near Chernobyl?

radar
559
heavy water radiator
133
protective screen
250
graduation tower
86
Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.
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reach: rather globalCold WarradarsSoviet UniontechnologyUkraineUSSR