A short history of the spy balloon BBC News

The US shot down what they believed to be a Chinese spy balloon at the start of February, sparking a global discussion on what the UFO could have been. But in an age of drones, satellites and hitech spy planes, why would any world power still be using balloons for surveillance An expert explains the reasons a technology first used during the French Revolutionary Wars remains so in demand today. Please subscribe HERE , BBCNews br, br,