Personally would not worry about that, a few people seemed to get pretty pissed off a few years ago when they found out there very expensive house were floating on a thin crust of eath above thin air. The fuel tanks were filled with soil up to the curent boundary of the base, it was an interesting process and the size of the tanks quite suprising. I still have an IPENZ article floating around somewhere about the way the went about it with some interesting photos.
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