It definitely wouldn’t work, if a foreign power really wanted to target their systems that happens to be airgapped you just shift your tactics accordingly. You do spearhead attacks on specific individuals, and then get them to unsuspectingly infiltrate the system for you. This was how Stuxnet and similar worms worked in Iran.
There are other techniques for infiltrating/hacking airgapped computers, like listening to the harddrive, or getting computers to communicate via inaudible frequencies on their speakers/mics, and there’s others that escape my mind.
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