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This Drone video shows the Flakturm VII – Augarten in Vienna. The Flak Towers fulfilled two purposes: They held cannons and spotlights that should fight airplanes from the ground; and they were important bunkers with an autonomous electricity, air and water supply system. 

They are made of 20ft thick reinforced concrete...that is bunker concrete, bunker concrete has by weight up to 2 to 1 ratio pf reinforcing steel to concrete.


Ali Buck (Youtube)

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