Air Combat
No air here. Different concept; large oval, you are underwater, totally. Weapons fire & are available floating above you. Air is not a problem. Read me is a pict with directions for swimming; hey, we all know how to do that! This is interesting. Comes with a lid/cover on pool so you're not going anywhere but staying & blasting away. Couple of hidey holes inside some columns.
Levels in map "Air Combat":
water