I feel unbalanced and dizzy looking at this, as if I am about to fall down a mineshaft. Good job of conveying that. Probably not really a vertical hole, but that is the impression it gives me.
The processing adds a texture that makes this image work and I like the dark hole leaving you wish a question; I wish there was someone or something in the image to convey a message. As it is, we have a picture of a tunnel...
Initially I rated all the natural shots highest and then there were a few of the manmade tunnel shots that rose above. Yours dropped down just a bit because I rate each challenge by pitting photo against photo. I gave you a 7. Technically it's okay and it definitely meets the challenge it just doesn't have the wow factor that some others do.
Add photograph to your favorites
Add photographer to your favorites
