Pretty much everything is automated in industrial facilities. That means a lot of the major and ancillary valves (water, natural gas, propane, fire suppression) as well as temperature setpoints and thermostats are controlled by and adjusted by a computer.

Ex.- Hack into into logic system, click to close a water valve, then turn the temperature on the boiler to the max. The water boils off and now you have a fire.

Everything has safety parameters to shut down under certain conditions but it's easy to turn those parameters off.

I've personally witnessed a multi million $ accidents.I could only imagine what someone with bad intentions could pull off .