@overdev, in the isle of Kor, during the mission the potion shop keeper in the noble's quarter gives you.

where did you take the last two screenshots (in the dark blueish color)?

mod updated to remove a reference to an underwater fern I apparently moved by accident. Thanks to mrHalfer for catching that ... I hate dirty mods.

if u want, i can send clean esp file, or u can look it in "enderal edit" tool :)

I'm talk about it (sorry for external link):
https://fastpic.ru/fullview/106/2019/0903/_aa2e5c96f776ad0a800cb24dd8e78868.png.html?noht=1
No one change in this worldspace, but it include in esp file (creation kit bug, maybe)

@mrHalfer, I'm not sure what you are saying exactly ... I made no changes to any Worldspace cells, I only adjusted the Underwater Imagespace files, the first 2 screenshots are regular ocean, the other 2 are in the Isle of Kor Caves which are hard to see in even with the fog pushed back 3.5 to 4 meters.

Looks is good.
But, please, clear esp file for "IsleOfKorCaveWorldspace" cell. No one change in this, but it's replace cell-name space