The real question that needs to be asked is “Why are these facilities on the effing internet in the first place?”
When I was an engineer we had our company’s developer network on it’s own server without internet access. Problem solved. Impossible to hack if you aren’t connected.
Stupid governments.
Actually, it IS possible to hack machines that are not connected to the Internet.
It was exposed in the book “No Place to Hide: Edward Snowden, the NSA, and the U.S. Surveillance State”.