Real professional grave robbers, familiar with geomantic surveying and mapping, and distributing gold to locate caves. They determine their position according to the feng shui pattern and trend of Yindong, because the feng shui potential of large ancient tombs is unique. Then use Luoyang shovel to dig into the soil and pull it out to see if there is rammed soil. If there is a tomb, it depends on the texture and soil quality of rammed soil to determine the dynasty. Then plan the method of opening the tomb. Some ancient tombs have been eroded by wind and rain because of their age. It is wrong to rely on this judgment.
Be detailed enough.