"Royal Navy Stoker With 21 Years Service Nicknamed “Popeye”, Photographed On Board The Hms Rodney In September 1940"
"A stoker was responsible for anything from the propulsion systems to hydraulics, electrical and firefighting systems. The HMS Rodney played a major role in the sinking of the German battleship Bismarck in mid-1941"
Beautiful design
What do you know, masks didn't work then either.
Prove it, and then prove they don't work now.