This is one of the torpedo bays on the USS Bowfin. It had 10 torpedo tubes and a total of 24 torpedos. The Bowfin, one of 288 subs that saw combat in WWII, is famous for sinking more than 40 enemy ships. It is one of only 15 fully restored submarines from that time period.
Interesting to see all the different industrial looking parts to it. And a little unnerving to think about such a pretty, smooth, shiny item being so deadly!