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What was the function of this colossal structure near Chernobyl?

radar

heavy water radiator

protective screen

graduation tower

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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