Super Evil Shit™: https://www.controleng.com/throwback-attack-an-insider-relea...

More generally, there's a vast world of civil / industrial infrastructure controlled and monitored by SCADA / PLC networks - boring stuff, city scale water and sewerage, mineral processing plants, refineries, port loading, reserve tanks, pipelines, etc.

Regular technicians carry cyberdecks / portable work units that speak PLC alongside ethernet.