I think he might be referring to the underwater fog?
Correct.
For an effect less blue and more similar to enhanced water, take version 1.1.2, increase reflectivity, and increase the blue component of inExtCoeff and decrease the first component until the water looks grayish.
I already had the latest version, but tweaking the inExtCoeff helped quite a bit. In case anybody else wants to have underwater color similar to Enhanced Water, the values for my inExtCoeff are 0.3884, 0.3984, 0.4800
http://img.photobucket.com/albums/v510/mattkaine/Oblivion/Oblivion2011-04-1214-44-55-37.jpg