The Zurich Marathon in April next year is probably not for the claustrophobic.
8Km of it (there and back) is in the new Uetliberg tunnel!

This is before the tunnel opens so hopefully you won't be dodging cars and lorries in the dark.

Anyway, it's a one off for the Zurich Marathon and you can be one of the first to experience the new tunnel.

http://www.zurichmarathon.ch/e/index.php

I can't imagine anything more mind numbing than running in a tunnel for 8k......are they serious? I assume they will have some bands or something in the tunnel

Something like this was organised in Dublin before the Port Tunnel opened (wasnt a marathon though). One of my friends ran in it and apparently the heat in the tunnel was horrible, but good luck to anyone who decides to do the marathon!