Underwater Post-Processing Works for shallow depths only

This is an interesting one and it is probably an easy fix… I’m new to UE in general so please forgive me if this is a noob question. The docs don’t seem to really address the different settings as far as I can tell though I may be reading the wrong documentation pages…

I have a large lake which is quite deep in my landscape (the top photo). When I enter the lake, the underwater post processing works and looks great just as I wanted (middle image). However, if I keep walking down the slope deeper into the lake, the post-processing simply goes away (bottom image).

I have to imagine it’s some sort of bounding box issue, but I can’t seem to find a way to increase the size/depth of the post-processing.

Anyone know how to deal with this?