kind of confusing to me when I see someone do a modern sub but the lower half of the hull is all stained with algae, salt, and rust. modern subs spend more time submerged than surfaced. unless they're going for the "in port for shore leave" look?
links related is what I'm talking about
https://www.youtube.com/watch?v=_QE2Tmsv3so(don't get me wrong, this guy is one of my favorites)