But what surprises me is that this is not the kind of rock wall found in ordinary mountain caves, and there is not even any trace of soil layer. Instead, it is made of solid bluestone bricks, even after thousands of years of use. Over time, the bricks have turned black, but they can still be identified if you look closely."Sister Qian, look at these bluestone bricks." When I saw these bluestone bricks, I was surprised and at the same time, I became more vigilant."Yes, the bricks here are very sticky, like layers of moss." Xu Qian wanted to reach out and touch it, but she was afraid that she would feel sick, so she gave up the idea.Rainfall is scarce in Tibet. Except for southern Tibet, it is generally difficult for the water and soil in other places to have this situation. Even if the soil layer contains moisture, it is mostly frozen soil. But not only is this place humid, it's also so obviously man-made that it's incredible."Lin Kun, come and see.
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