[Community Project] WIP Weather & Water Shader

Hello!
Anyone can help me in an underwater scenario?
I have a glass dome and I would like create an underwater oceanarium scene where player can watch fish/shark within the dome.
If I correctly understand, the underwater effect created by a post process volume. (PP_Underwater)
Any solution to add underwater effect only outside of my dome?
As the thread is huge, a link to the answer also appreciated, if such an explanation already exists.
Thanks a lot!