The picture feels like off-balanced. Slanted perhaps? Is this intentional?
Just some personal thoughts on creating that lonely/moody/long/dark kind of feel in this sort of shots... An extreme wide angle would suggest the end of the tunnel to be further away than it actually is... Messing around a little with your exposure settings can also help to achieve the mood. For example, darkening the end of the tunnel to the point that you cannot tell what lies beyond. Alternatively, overexposing to the point that all you can see is a bright "nothing" at the end, which also suggest some mystery at the end of the tunnel.
Fun things you can try... Go for a really low perspective shot. To exaggerate the height and size of the tunnel. Right now from this perspective that you took the shot, it's just another normal human being eye-level kind of view. Makes it a little boring don't you think?