What is 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.

Answers distribution

radar
heavy water radiator
protective screen
graduation tower
answers
flagUnknown
68%
13%
15%
2%
44
flagPoland
50%
15%
24%
9%
640

Gender

men57%
women32%
radar
57%
32%
heavy water radiator
14%
23%
protective screen
16%
38%
graduation tower
11%
5%

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What is the function of this colossal structure near Chernobyl?
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Author: Ninjai
Illustration: wikimedia
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