I had a play with the second one. All I did was open it in Adobe Camera Raw and set the WB using the dropper (I actually clicked on the diver's camera).
The colours are still not perfect, but much better than straight out of the camera. Still needs more red in the shot, but this was a warm as I could make it in ACR while still keeping the water blue.
You could probably do something similar in PS. But it would be more work, would probably involving masking the image and layered manipulations. This is one adjustment to the whole image, and because it is done in the RAW conversion stage the histogram is still in good condition (rather than looking like a comb, had you done these manipulations in photoshop working on a JPG).
Anyway I am sure others will try different things.
Alex
