IN oblivion when ever i went swimming underwater i could never see a thing untill it was right infront of my face, anything further was just a blue haze, i really hope you can see further and clearer underwater this time in skyrim.
there should still be some have, but not so much that you cant see anything. it should also look lighter if you look up and darker if you look down not just have a set light level for the depth that you are in.