lol, I've been contimplating the same thing. The trick is having it as real object that you can collide with, but making it not hog more resources than the bizarro giant rocks/alien plants covering on the ocean floor. Everything that is put to that nonsense should be redirected to real barrier reefs. It just ain't the Pacific without them. It makes Truk in particular more than a little bit absurd.
One big roadblock is that I can't really see how it could be made visible from the surface. The game has no real code for the sea surface breaking against something (just check out the "beaches" and compare to Pacific Fighters) and the transparency doesn't extend to anything other than ships (and even that brings my system to its knees).
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-AKD
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