Underneath Disney World - Utilidor

http://worldofwonder.net/tradesecret-the-hidden-utilidors-of-disney-world/

http://www.bigfloridacountry.com/wdw/utilidors.shtml

1. Why Utilidor?

2. What is for?

3. How to get in Utilidor?
http://www.disunplugged.com/2011/05/02/behind-the-scenes-at-disney-world-the-backstage-magic-tour/

4. Disney underground info!
http://www.hiddenmickeys.org/wdw/magickingdom/secrets/general/underground.html

OK. Wiki
https://en.wikipedia.org/wiki/Disney_utilidor_system