The engine room of a late 1930’s diesel electric submarine
Submarines are one of the greatest feats of engineering, perhaps second only to space travel. In 1928, a new type of submarine using a combination of diesel and electric power as a propulsion device emerged. There would usually be two massive diesel engines that would work essentially as generators to charge the electric drive system. Working in these rooms were hot, loud and dirty, but so was most of the submarine life.