Fabulous shot. So much to look at and a great contrast between the solidity of the environment, the solid (though still slightly moving) silhouette of the man in the background and the fluid blurred "ghost" in the foreground.
This is a really neat effect you have captured. Because of the lighting conditions and your shutter speed you have captured a moody, dark feel to the tunnel ALONG with the 'ghostly' forms of the people walking by. This has a bit of a Hitchcock feel to it - seemingly normal situation/area with some surreal/out-of-the-ordinary/supernatural mood. The B&W tones in this composition are wonderfully dynamic.
Wonderfully bizarre image. Are these people running toward you, or moving then stopping? Did you do this many times until you got one you liked? Did you do this with models or are these just passersby?
What a stunning start to the challenge, exceptional use of light here. The movement is very artistic, yet the stationary figure at the end sets it off nicely. Fav.