Good use of overexposure to make a lot of contrast on this one. I'm not wild about the picture overall, but I can really appreciate what you set out to do with this shot.
Engaging shot with lots of drama. Subtle use of neg space, as there is always something to look at, but the darkness in the foreground really hints at what is in the other, darker, direction.
Great title for this shot. I like that you can see just the slightest reflection of the water within the blackness leading to the cave opening. I think a sharper focus would enhance the image a little since there seems to be so much wonderful detail in the stone. The brightness of the sun also seems to wash out some of those details. Otherwise, I think this is a nice contribution to the challenge.