Extreme Winter Snow Tunnel

If you want to build a snow tunnel like this, according to the uploader of this vid, you have at least 1 foot of snow. Buffalo anyone? Anyways, this old vid from 2007 is viralling because this snow fort is just so cool! 
It was made in  Alberta, Canada using a tractor, and taking the better part of 3 days to build. We're getting too claustrophobic just watching this...  

magnusdonvon