Photo credit:Bert Kaufmann/Flickr
The transmitting antennas used by Duga were massive.
Others thought its purpose was to jam western broadcasts or disrupt submarine communications.
Only when the concept was proven, work began on the ultra-high powered operational system.
The Ukrainian government now allow tourists to visit the still standing antennas of Duga.
Photo credit:thepurpleblob/Flickr
The Duga control center.
Photo credit:Paul Duncan/Flickr
