In fact, many ancient tombs that have been developed now have such a setting, that is, at the entrance, ancient craftsmen will use natural stones. As long as the last craftsman comes out of the cemetery, this natural stone will resist the door, so those who come out will never be able to push open the stone gate of the tomb, so the tomb will not be found.

In fact, this natural stone has been used in Dingling. From the outside, the stone gate of the cemetery has no handles, no bolts, and even no key places. However, now that the door has been blocked, the employer can't push it open at all. As you can see from the crack of the door, there is a stone pillar firmly resisting the Shimen. But in fact, as long as this stone pillar is removed, it is possible to open the Shimen.

This is an ancient natural stone, which can not only close the tomb door, but also avoid worrying that the last craftsman will be buried in the cemetery. It is not accurate to say that craftsmen will eventually be sealed in ancient tombs. After all, in so many developed ancient tombs, there are no bodies at the door or anywhere else in the cemetery, which also confirms that the craftsmen who built the tombs finally came out.

Zilaishi also used the door shaft of Shimen. The ancients specially ground the door shaft into a ball to facilitate rotation. A protrusion was chiseled in the middle of Shimen, so that it could be closed. Zilaishi can also slowly close the stone gate through its own importance and the pressure brought by inclination. When it enters the groove smoothly, it will be difficult for outsiders to push open the stone gate again.

If modern people want to open such a stone gate, they still need to use professional machines, which is almost impossible to complete by manpower alone.