Let me get this straight: You want to make a "harvestable" substance (oil) that grows and behaves (and apparantly looks) like veins. And you want to do this on the water? Only way I can think of is to make the gems a type of tiberium that can go on water and make it look like black veins (or however you want 'em to look). If that is your original idea. Then again, maybe I'm just idioting again.

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