The first primitive Chinese sunken courtyard dwelling dates back to around 2000 B.C. in the provinces of Shaanxi and Shanxi, China by most of the Jiaxian County. It is been known that these underground housings precedes the houses built above ground. Even after 4 millenniums, there is still around an estimated 30-40 million Chinese who lives in these shelters today and are confined to the region along the Yellow River in Northern China. The yellow earth, also known as "loess soil" of this region is structurally uniform and free of stone, plants, and trees. …
