Spy balloons are really blowing up right now. The US has shot down one confirmed Chinese balloon and has engaged several other unidentified flying objects. But like so many things we cover on this podcast, it's an old method in a new outfit. Spy balloons for reconnaissance go back all the way to the French Revolution and pop up again in the American Civil War.

To talk through the history of spying from the sky, Dan is joined on the podcast by the curator at the International Spy Museum Dr Andrew Hammond who also hosts their podcast Spycast. They discuss the ideas that have taken off and the ones that haven't... including pigeons with cameras, drones disguised as dragonflies and satellites in outer space.

Produced by Mariana Des Forges and mixed by Dougal Patmore.

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