How can we get through the iron gate opened by the authorities in Qin Shihuang's tomb in The Legend of the Sword and the Chivalrous Man?

Facing the iron gate, go left, cross a shabby passage, and you will arrive at a hall. There is a high platform in the middle of the hall. On both sides of the high platform, you can see stones protruding from the wall as organs. After pressing them, a terracotta army square will appear in the center of the hall. At this time, the iron gate has been opened and can pass.