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The Petrovaradin fortress with its underground represents the largest preserved anti-mine warfare system in Europe. The system of mine and listening tunnels, which extends under Petrovaradin, is about 20 kilometers long and has not yet been fully explored. The Petrovaradin fortress has long been the strongest and most modern armed fortress. of the Austrian monarchy, which was called Gibraltar on the Danube because of its dominant position. introduced to some of the secrets of this fortress by the members of the Association of Researchers of Petrovaradin, who have been taking care of its underground for years, from which they have so far brought out several tens of tons of garbage, rubble and other construction waste. The show's editor, Branko Stanković, is the author of 18 documentaries and two dramas that were screened on RTS, as well as many documentary shows, which, like the films, were awarded at domestic and international festivals. Label and copyright: Radio-television of Serbia Any copying of video and/or audio recordings and uploading to other channels is prohibited! #kvadraturakruga #rts