Well, if the ground temp is consistantly averaging a temperature that is more desireable than the air temperature then, yes, no insulation will be the way to go.

It looks as if you have plenty of rock there to build with if it is as strong as it looks. It looks like limestone. Are you able to just dig it out? Or does it take a ripper or some other special device?

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.