A year or two after I took this photo, I read an article telling how to do a multiple exposure. I was guessing the exposure settings when I did this one and didn't record what I did. I used a 70 -210 zoom lens on this image and very carefully moved the tripod leg a tiny bit after each exposure. The tunnel was built in 1916 an is about 3/4 of a mile long. I had to walk through the tunnel to get this image because it is not easily accessible from this side. The other entrance of the tunnel near where I parked is just ugly sprayed on concrete.