Reckon you would be right there too. I recall having to take a canary with us when working near the top of the blast furnaces and if it fell over you had to fit your gas mask quick and get out of there. The intial rolling mill billet stand motors were 15,000hp DC English Electric motors (for speed control)via rows of contactors and resistor banks. You would walk inside them when carring out maintenance like changing brushes. I assume it is all done by AC motors via invertors now,but this was in the day before heavy duty electronics.