The message .com
from contains these words:

If its done as a one off house, yes it costs, though jcbs make that not
excessive any more. But if it were done en masse, one would only need
to excavate a foot or so, build the layer of housing then put the soil
on top of them.

Or, if you fancy a grand scheme, try this one from 1931...

http://blog.modernmechanix.com/2006/...y-earthquakes/

Or this bloke from the 30s as well...

http://blog.modernmechanix.com/2006/...ng-as-a-hobby/

--
Skipweasel
Pay no attention to that man behind the curtain.