RE: Know nothing about , so?
Hi:
Once you get into subs for a short while, you'll get past the "let's see how deep it will go and still come back up" phase and realize that the best depth for visual appeal is just below the surface, or periscope depth.
Its sort of like flying model airplanes, one of the most commoon questions is "How far will it go?" and after you've flown it out to what seems like a million feet away and come home again, the best flying enjoyment comes from being in close.
Give subs a try, its really neat stuff.