If you check out this thread http://www.pirate4x4.com/forum/showthread.php?t=433962&page=4&highlight=truehi9 go to post #80, in the second pic there is a tunnel. I was told by another comp guy that they are supposed to go into that tunnel turn around and come out the same end they entered. I was told that it is very tough if not impossible to do so without breakage. I cannot imagine what that Detroit is going through in such a situation.