One person, or two ?
Just the passageway, or the outside graffiti too?
Or the cyclist?

I think I like #1, The way the gentlemen is standing and looking gives me the impression he has a connection with the graffiti some how. I like the colors in the picture as well. Nice work....
Greg

Different. Personally, I prefer the third without people. It makes you think more than the others. The other shots, the people seem to command your attention but there just isn't anything special happening, so I think the third sort of beats them out. I also prefer the composition of the third shot.

It could be a little bit darker too to add more mystery. Try darkening the outside walls but leaving the tunnel as is, see what happens....... -GB

I tried ...

Wow, that's freaky. The arch seems to be a seperate entity instead of an entrance to a tunnel. It seems perhaps too much? Pretty powerful effect either way.

I took it as far as I dared :)
Mask was along the bottom of the wall, around the arch, and off the bottom of the other wall.
So the tunnel was untouched.
I tried to tone down the other end of the tunnel with levels in the 2nd, but I'm not happy with it.