Submarine pressure hull

Here’s a model of a Virginia-class submarine with bow planes. The bow planes are retractable, as can be seen in this great photo of a Virginia-class sub.

Here’s some photos of fairwater planes. This term for sail-mounted diving planes is apparently exclusive to U.S. Navy submarines. I’m not sure what the etymology of the name is, but think it may be an alternative name for the sail itself. That said, as far as U.S. submarines are concerned, the term is only used as a descriptive modifier in the term “fairwater planes.”