I think the reason the Green looks deeper and better is the color of the Subs. If they were close to the color of the Water as in the upper one I think preception would be different. (NOTE: Even Yellow and Orange Subs look to be similar color of the water until they are lit with a light source.) In my opinion, neither looks too deep because of the unexplained light on the wreck(?) and the light pattern on the sea floor. I think after about 100m (or less) you no longer get that affect. Also, the Sharks swimming around makes it appear shallower as well. I would like to see one with the Subs recolored side by side with the top one. That to me would be better to judge. Great image all around (and in both cases!) I doubt I would have picked up on the Sub Color if you had not put the other image.

ratscloset
aka John