I took the liberty of tweaking another great reshade for this game, "TheDepthsBZ", so it's a little more subtle, less contrast. I thinks it looks a bit more realistic, while still preserving good visibility and the classic feel of Subnautica visuals.
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Just check out the screens.
Download ReShade, then select Direct3D and select all the options to install (not sure which I used).
Copy my .ini preset into main BZ folder. Once in game press 'home' button, then select my preset and voila!
If you want ti switch it off for comparison just add a keyboard shortcut to <toggle> the reshade.