How did the last craftsman come out after the Mausoleum was built?

In 2 10 BC, after the death of Qin Shihuang, Hu Hai, Qin Ershi, ordered that anyone who had no children in Qin Shihuang's harem should be put to death, because many concubines in the harem did not give birth to Qin Shihuang, so many people died. Not only the servants of the harem, Hu Hai also put the abacus on the craftsmen who built the mausoleum of the First Qin Emperor. Qin Shihuang built a luxurious mausoleum for himself before his death, and placed a lot of gold, silver and jewels after his death, so that he could take it to another world after his death.

Hu Hai, Qin Ershi, is afraid that the people who built the cemetery palace of Qin Shihuang's mausoleum will know the entrance to the underground palace, and then they will join others to rob the tomb. At the same time, according to the superstitious tradition at that time, they hoped that Qin Shihuang would have many servants to enjoy in another world, so they decided to leave all the craftsmen who made tombs in the underground palace to be buried with Qin Shihuang.

"Historical Records of Qin Benji" records: "After the burial, or the craftsman rides, Zang (that is, the slave) knows it and is heavy. The great event is over, and I have closed the door of envy and the door of the craftsman. There is no comeback. "

In other words, Qin locked the craftsmen in the underground palace and they couldn't get out. In fact, when Qin Shihuang forcibly recruited skilled craftsmen to build the underground palace for himself, these craftsmen should have seen something. With the prevalence of martyrdom at that time and the tyranny of Qin Shihuang, they may not have a good end in the future.

These people are very clever, and they left a secret hole for themselves to escape later, but because the design is very hidden, the supervisor actually can't see it at all. This mechanism, also known as "wooden bolt top door", usually leaves only a gap.

However, if the emperor killed these craftsmen, when the tomb was closed, craftsmen could use this gap to open a secret passage to the outside world. Of course, this is a folk rumor in unofficial history, but the system of human sacrifice continued until the Qing Dynasty. Sun Dianying found such an organ passage when he was robbing the tomb, which must have been prepared by craftsmen to prevent accidents.

People can cope with closing the tomb door, but some cruel emperors are not so kind. They probably killed everyone who wanted to be buried before the first emperor was buried, so there was nowhere to escape.