This bug seems prevalent in the Skyrim world but I cant find any reference to it on US. Its not even that its murky or dark - its just a solid grey or green screen. The TWS command works for completing quests or I can turn off ENB.
There is a good mod for this problem Green Water Fix over at Skyrim Nexus. I recall being able to see underwater before when I began to play the game but now I cant. This is supposed to be a 100 working solution. For some reason some users have issue with the DoF underwater. Whenever I go underwater I cant see anything. Type tws into the console.
The Green Water Fix should work for you even though your water isnt green.
Set your Skyrimini and SkyrimPrefsini to High or lower with Bethini. Published on Aug 21 2014. This mod requires iMaxGrassTypesPerTexure7 or above eg. This mod aims to overhaul the flora fauna and visuals under water. Itll change the saturation so that you can see underwater. This bug seems prevalent in the Skyrim world but I cant find any reference to it on US.