[WildHighlander57]

An “inside job” —could— get past the defenses even if the production facilities are isolated from the internet.

[TangoLimaSierra]

An “inside job” —could— get past the defenses even if the production facilities are isolated from the internet.

Like leaving USB drives laying around with malware on them.
IIRC that's what happened to Iran's centrifuges a few years ago.

[meyer]

An “inside job” —could— get past the defenses even if the production facilities are isolated from the internet.

Us operators along with the IT people are subject to an FBI background check. I was about to say that would help prevent an "inside job", but on second thought, that might bring about an inside job. The fibbers are not on the side of the Constitution or the American people any more, I'm afraid.