I did that because when you see diving movies in open seas in the atlantic or elsewhere northern i guess, you don't usually see that many algae floating which is what seems to constitute those impurities (it is how they are labelled in-game ie "impurity.dds").
I favored best some kind of light impurities and gives it a rather "bubble" like appearance which is no more realstic, but fits more in the mood for me (like those photoshop edited marketing screenies from SH4 for example). Looks more atmospheric, especially with the depth of field now in my opinion but it's a matter of taste I guess.
In the baltic sea, there's not much algae floating i guess, it's the entire sea that as a greenish-brown tint maybe, i would rather guess, no?
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