How fun. Practical implementation in most cases is movie plot level implausible, but for certain high value systems we already know that state level actors have

How fun. Practical implementation in most cases is movie plot level implausible, but for certain high value systems we already know that state level actors have the resources and patience to do something like build a side channel link by having air gapped systems relay in and out via acoustics with HVAC or whatever. This is going to be a lot more serious as IOY device capabilities increase -- so many available microphones and radios built into everything.