One of my first steady jobs was as a tour guide on USS Cobia, a decommissioned WWII submarine.  (Yes, I know this gives away my location a bit.  It already was findable information and I'm old enough I'm not really worried anymore.)  I spent 5 years working giving the tours on the submarine and learned an awful lot about it.  I wanted to get this pic years ago, but after I parted from the job, it moved down on my priority list, only recently to resurface.

Here's Arrow giving a tour!