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Underwater world is done for photography !

I'm not sure I understand what do you really mean by saying that. How or why it's done?!

I mean underwater colors and scenes are really nice for photography

Thank you very much for the explanation!
When you said it's "done for photography," I though finished in some way (not popular, interesting, or else anymore). And that thought shocked me, as I was thinking how could it be possible as for me it seems like a never ending and inexhaustible source of all sorts of diversities constantly appearing in some new forms, colors and shapes.
But now I understand, what you wanted to say, in fact. :)