[quote=Elendra]
 Several more questions on submersibles. If there's a lot pumped into making a super navy, and submersibles were taken (and 'appropriate mechanist traits'), would any ship be able to be a submersible, or would only certain ships? Would this increase the cost of the ships? How slow would it take for a ship currently on the surface to dive, and one submerged to surface? Would it be reasonable to surface and then open up into battle, and before retaliation close back up and dive? :3
[/quote]

It could be any ship, but you'd have to declare it ahead of time, and making it submersible will cut its weapons down by three quarters. Diving and Submerging would be something that'd take at least a minute. Diving before retaliation would only occur against the most inept enemies ever :p