if you wrap it in insulation and add a gun safe dehumidifyer you can leave it in your shop or shed or basement....
I'm not too sure I get the concept of burying it. Certainly not up here, the frost line is 5 feet down, so earth temps won't do the job that I'm thinking root cellars are supposed to do.
I'm not sure I understand this myself. I would think that the vent holes/tube would have to be deeper to create a thermal barrier of warm air entering the freezer. I saw this on some homebuilding show done up north in someone's cold room. I also don't understand the humidity aspect: a lot of produce stored in root cellars requires high humidity, while others need it very dry. Having a dirt floor root cellar generally solved this problem: too dry, wet the floor; too moist, open a vent. Here's some other examples: http://www.windward.org/notes/notes70/lindsay7021.htm http://www.earthineer.com/content.php?blogid=2610 --> You'd have to know your water table was low for this one AND I think you'd want a layer of gravel below.
