I process UW shots sometimes, I made VD plugin for it (not much different from some yuv adjust variation).
What I do is roughly these steps (in this order):
1. white balance - focused on some white/gray objects at pleasing distance
2. luma contrast (levels)
3. overall saturation boost
4. try to saturate/desaturate specific colors. Often the colors end up so much quantized it is just better to get rid of them completely.
Not science, I just get something that I like to look at.
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