I would emulate Pacific General for Subs:
http://www.matrixgames.com/forums/tm.as ... =�
"If that is the case, they should add the cool periscope running through the water when they move.
More realistic and makes it obvious they are subs. Back on the surface start of turn.
I seem to remember that they actually only went under water if you used 1/2 or less of your move.
So, let us say the sub can move 4 hexes. If you moved 2 or less it dived, and could surprise ships, even destroyers.
If it went 3 or more hexes it stayed surfaced until attacked, then it dove if evaded attack.
Doing 1/2 or less movement was using the Sub stealthy, thus it gained a surprise if another enemy ship ran into it. Of course
Destroyers still attack even if submerged (but reduced attack), whereas other Capital Ships could not. And that is pretty realistic as BB, CV, CA didn't carry
depth charges. "
PAW