Clear view right under water, but kept low visibility deeper. Removed all blurs DOFs and Vignette effects. Original water distortions are untouched fog adjusted to clear up right below surface. In extreme depth like on pic3 some blur and noise distortions remain.

timecycle_mods_1.xml - is needed for under water high
underwater_deep.xml - for deep waters

I never been fan of cheap blurring effects nor DOF unless aiming with scope or anything like it.

Use OpenIV and replace
timecycle_mods_1.xml at - update\update.rpf\common\data\timecycle
underwater_deep.xml at - common.rpf\data\timecycle