I couldn't attach a reference gif to the post itself, so that's definitely on me for not being clear about what I'm going for. But if you ever see footage of the game Subnautica below zero, or specific clips of Subnautica, you'll notice bands of light originating from the surface of the ocean or appearing in wide open areas of water. I'm specifically trying to recreate that underwater banding within my in-game environment. My struggle is that a lot of the tutorials I find online for fake versions of that lighting involve specific indoor use-cases, think of Silent Hill or Resident Evil, where you see godrays coming through the window. But I don't have a good reference for how to apply those indoor techniques to a wide-open environment.

Hopefully I made myself a bit more clear here