Mod Idea: Underwater fighting
Could be worked over alittle bit though..
Add some fins and fans to the ship, and some 'leaking' bubbles would give a nice impression. Ships would 'hyperspace' when it's safe to (far enough from water debrey). Major resources could be Oxygen, and (obviously) some sort of building material. I haven't really thought alot about the general ideas that could be done, but if I had the time and I was making a mod for this game; it would be definetaly underwater. (Sorry for any spelling mistakes, too lazy to put into Microsoft word today)