We all know that Wu Zetian had an able man named Yuan Tiangang, who was a Taoist priest, so he attached great importance to Feng Shui. There is a certain choice in the choice of Wu Zetian's mausoleum, that is, he makes suggestions. Therefore, I personally think that in Taoist theory, the feng shui of Wu Zetian's mausoleum is very good. Because they had the most professional Taoist priests for their reference at that time, the construction of Wu Zetian's mausoleum cost a lot of manpower and material resources, and the design was also very clever. So I think it's normal not to open her grave.
Wu Zetian's mausoleum was built on the mountain, that is to say, her mausoleum is connected with the mountain, if you want to steal her mausoleum. Then you need to open the whole mountain, which is impossible for human beings. Because even with the current technology and manpower, it is very difficult to do such a thing, not to mention the lack of manpower, material resources and technology at that time. Even though he has 400,000 people, compared with the mausoleum built by Wu Zetian, it is still nine Niu Yi hairs. After all, she is the greatest female emperor in the history of China, and the protection of the mausoleum is absolutely unmatched by others.
To sum up, the reason why Wu Zetian's mausoleum is difficult to open is because she has a unique design for the mausoleum. And at that time, there were very professional people to help her protect the tomb, so it is normal to say that it can't be opened. After all, it was a collection of efforts of an era.