But regardless of whether Islamic State’s floating condom-bomb works, the concept is entirely sound. For more than 50 years, the United States, Russia and others have experimented with similar weapons.
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Perhaps the most well known analogue is the barrage balloon. A simple device, the balloons are anchored to the ground with a heavy metal cable.
Strong enough to withstand the impact of an airplane, the line presents a dangerous hazard for enemy aircraft. A network of the unmanned blimps could protect cities or important military facilities.
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