>>3398141Raw is good but if there's no information in blacks then bumping up won't save them
For night try to work with the darkness as negative space, never done underwater but I imagine it's difficult as hell to get good lighting and wide apertures for that
>>3398005>>3398049For the cave one work on isolating the diver and light, keep the rest of blacks and shadows of the cave dark with only barely detail (zone I and II), bring up light on the diver and emphasize colors and lights flowing through water casted on diver. Might have to play with colors to get diver to stand out in light
Here's some inspo for what you could go for
>>3397997This one's actually pretty good, do some post procesing wiht lighting and colors and you have decent photo