I think you've done a great job at creating this eerie, undersea setting. I definitely feel the depth of the ocean here.



Some people may think it is too dark, but here is something to possibly explore in the future:



What would happen to the composition of your image if you would take away all light columns from the surface and have the only light sources be the submarine lights and the glow of the crystals?



I think it could make for some additional interplay between the positive, lit space defined by the sub lights and faint crystal glow and the negative, black space of the unlit waters.



Could get really interesting to mess around with.



That's what you're already doing in a way. I think taking the surface light away would take this composition (or future ones) to the next level in terms of depth and composition.



Sorry for rambling. Keep up the good work!