[alkonaut]

I tried parsing it several times but from what I understood, they established an Internet connection out from the air gapped network, without coming into the facility with a big reel of network cable. So it seemed the network wasn't physically disconnected after all?

An air gapped computer is pretty easy to create -- just disable the radios and don't connect any network cables to it.

A network would be much harder but the key has to be that there are no other non-air gapped machines in the same facility. If someone wants to bridge the gap it should be obvious by the cable coming in the door and running all the way up to the machine.

Obviously the kind of air-gapped networks I'm talking about are computers never involved in any internet business at all, the kind that operate power plants (or centrifuges...).