Because the wellhead of the deep well in the Forbidden City is very small, people can't get in at all, and it is very difficult to salvage it. Moreover, most of these wells are connected with underground rivers, except for some heavy treasures, other light ones are basically washed away.

The Forbidden City is the residence of the royal family in Qing Dynasty. It's magnificent, and the building is magnificent. The Forbidden City covers an area of more than 700,000 square meters. According to the statistics of later generations, there are more than 70 ancient wells in the whole Forbidden City. The Forbidden City has experienced thousands of years of historical changes, and the rise and fall of the royal family are staged here. In the late Qing Dynasty, the Qing Dynasty was backward and decadent. During the period from the invasion of Eight-Nation Alliance to the fall of the Qing Dynasty, there were too many escapes and changes, and many treasures in the palace were thrown into these ancient wells. Even after the demise of the Qing Dynasty, the Forbidden City remained intact, and every tile here revealed a heavy historical atmosphere. Then since there are so many jewels in the Forbidden City, why doesn't anyone go fishing for them? It turns out that the ancient wells in the Forbidden City are different from ordinary folk wells. Its wellhead is so small that even one person can't get in. Mainly used for drinking to prevent the palace from running out of water. Therefore, it is not easy to salvage the jewels inside. You can imagine the workload to dig all the wells. It is precisely because of this that people did not salvage them.

Moreover, the ancient well of the Forbidden City is connected with the underground river, which is running water, so it is easy to wash away these gold and silver jewels. Even if someone wants to salvage with a rope at the wellhead, they can only draw water with a sieve. Moreover, when the Qing Dynasty perished, Puyi continued to live in the palace, but food and clothing were very tight. Many maids-in-waiting eunuchs salvage ancient wells in exchange for living expenses. Over time, there are very few treasures that can be left in the ancient well.

What's more, after the founding of New China, the Forbidden City has become a national first-class museum, and everything here belongs to the state. Now, if someone tries to steal the Forbidden City, they will be severely punished and sentenced by the state.