Are there any starship modifications in the 2022 edition making a Traveller craft better suited for underwater operations? Presumably any streamlined or semi-streamlined ship can submerge as it's assumed ships can scoop fuel from oceans, but I'm thinking of ships that are particularly suited to deep dives and underwater use, like a system defense boat, but not to such extremes as the pressure hull for gas giant operations. There's no specific benefit mentioned to a reinforced hull aside from 10% more hull hit points, but I figure it's a given for an underwater craft, and presumably armor, although the sort of structural refit to keep pressure in/out isn't necessarily the same as hull armor intended to keep pointy/explody/coherent/plasma things out. I suppose some of the underwater accessories from Vehicle Guide could be adapted for things like sensors, but am I missing anything else for undersea spacecraft operations?