Alien intervention can be a fanciful aside, but an efficient use of the land wouldn't be for homes and granaries, but for agriculture. Far more useful to build homes downward as we do upward, is it not? At least that's my take.
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If you watch the video I'm sure you will agree that the sacrifice involved in building it could never be justified by such a motive as there was no need to conserve space in those times.Modern day Japan, with its land shortage wouldn't consider so massive an undertaking.