Mark
Frauenfelder at Boing Boing pointed me to an interesting collection
of fallout
shelter designs that the Department of Defense put out back in the
early 1960's. Not sure if I would want to stay too long in something so
small and confining, but the image above got me to thinking about a
modified version as a root cellar. Those big culverts are expensive,
but if you already had one laying around this might be a good way to
provide protection against the bad things out there while at the same
time creating a place to keep food from freezing.