1. Do the map diver glitch on the truck shown, but more towards the left of the truck than the right.
2. Then you should fall under the map but not keep on falling to your death like ussual!
3. Enjoy and have fun.
**also note that I got stuck when I did this, but if you try going the other way it should let you. I did this the first time I did this glitch, but didn't record it.=[ anyways enjoy**

http://www.youtube.com/watch?v=vHGENdT7m3w