When a craft goes underwater all the internals are immediately filled with water. I propose having craft with watertight compartments, for ex. sealed cargo bays should be watertight and offer a waterless environment.
I think the easiest way to achieve this is to have the camera or camera part to not show the underwater effect while the camera is inside (colliding with) a fuselage or inside cargo bays.
This post has been merged with this post.