It can be said responsibly that it is definitely not good. No one will touch the ground on the purlin.
China people's luxury houses pay attention to stability, solid foundation, and the soil under the house is like a cornerstone, which is one of them; The bottom of the house is the intersection of upper and lower yin and yang, and artificially breaking this balance surface has disadvantages and advantages, which is the second; The soil under the house accumulates water all the year round, and the smell of yin tide is extremely heavy, which will bring the underground odor into the main hall, which is the third; Digging a hole in the room is not meaningful. In addition, from a scientific point of view, one meter down, arouse the masses, the degree of utilization is not high, but also destroyed the overall coordination. Therefore, it is recommended not to dig.
From my home, I hope I can help you.