Okay, well, I have decided that it may be a good idea to show non-beta testers the wonders of this mod. So i did a few tests. This is a picture of underwater. In a room 3X3, with a few static barrels, and lights:Here are the results:
[img]null[/img]

Now, look at the framerate. Funny thing is, it is the same under water as it is while in.
In addition, rising opaque bubbles gently float to the surface. Where ever that may be.
Also, while under water, (thanks to Dumpus for supplying a new under-sea sound), well, as I just said, it sounds like you are underwater.
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This is still WIP, the bubble texture is bound to change.
EDIT: The bubbles have been changed now. They look much better,