Here is a photo of the USS Torsk, a decommissioned WWII submarine that is docked in the Baltimore Inner Harbor. The Torsk's claim to fame is that it torpedoed the last ship to be sunk by a torpedo in WWII. The ship was a small Japanese frigate, sunk on August 14, 1945.
The few times that I have seen an old sub up close, I am always surprised at how unstreamlined they seem? The surface of the hull has lots of holes, bumps, hatches, and other features that look like they would produce a lot of drag.