AGH!
I flattened the image out at one point so I could grab it as a single layer to work with in another file. And at some point the flattened version saved over top of the original and apparently I'd closed out the program in between so no chance of recovery- all those layers lost, and any editing to the underwater will need to be done directly on the only remaining layer

But at least I have a finished version, ready for the text layers! (and there's a backup PSD I'd made, but it was from before I did the ocean layer or rivers) There's been a few tweaks to get rid of some artifacts, added the rivers, and I redid the trenches in the lower left to bring the sharpness in detail back out, otherwise pretty much the same, not worth another upload just yet.