A team of artist hackers set out to expose the devices spying on us by sending a balloon to the edge of space.
Russian-born Danja Vasiliev and New Zealander Julian Oliver are part of a growing movement of coders and hackers who use their skills to create questioning and humorous digital art.
Along with Gordan Savicic, they wrote the Critical Engineers manifesto, which posits: "The greater the dependence on a technology the greater the need to study and expose its inner workings, regardless of ownership or legal provision
We follow the duo and their colleague Bengt Sjölén as they construct and launch their latest project: a weather balloon modified with a computer and radio scanning equipment to monitor and intercept what is impossible to pick up from Earth - transmissions in the upper atmosphere.
Director: Ladan Anoushfar
Producers: Hugh Hartford, Anson Hartford, Dan Davies