That would be the engineers in the heart of the ship. They keep it powered and running. They'll tell you themselves that they're the hardest workers onboard, but take a tour of their work area and you’ll believe them without question. They have to wear earplugs and work in heat that rises to at least 130 degrees in some spots. I took the tour for five minutes and couldn’t wait until it was over so I could escape the sauna. And these guys and gals work in that heat day in and day out, for several months at a time while deployed.