Why did Sun Dianying steal Emperor Qianlong's Yuling?
Did Qianlong secretly know that thieves would come to steal Yuling and "down" the top door himself? The same strange scene appeared again in 1975 when archaeologists cleaned the Yuling underground palace. Qianlong's coffin "walked" down against the stone gate again this time, playing the role of a natural stone. Some experts believe that this is due to the buoyancy of the leaked groundwater, which makes the coffin float. But why don't the other five move? Moreover, the four corners of the dried catalpa coffin are fixed with heavy stones. If it is due to the buoyancy of groundwater, there will be great waves, but the infiltrated water obviously does not have this condition. So far, experts have failed to come up with convincing archaeological findings to prove why Gan Long's coffin moved around and "cared" for his grave, which became a mystery.