"You guys stand back first," Li Zimu said as he looked at the black iron mother's door, this groove on this door was the same as the Tai'a sword he was carrying on his back, it should be the key to opening this door.

The few people retreated to the side, and Li Zimu took off the Tai'a sword on his back and unwrapped the strip of cloth wrapped around the sword. At this time, Tai'a Sword was not as dazzling as it was in the Overlord Hall in this dark dark room, and it looked similar to an ordinary sword.

This is a little different from the Tai'a sword when Ying Zheng held it in his hand before, I don't know if I can still open this iron mother door? Li Zimu thought to himself, and didn't stop for more, so he put the sword in according to the grooved arrangement, which just fit.

"Ke...... Axe handle...... Zizi ...... "After putting the sword into the groove, there was a sound from the iron mother's door, like the sound of a gear transmission, a little jerky.

When Li Zimu heard this movement, he also stepped back a distance. That way, even if something flew out of the door, he would have enough time to react and dodge.

The sound of the gears turning lasted for two minutes, and after the last crisp sound, there was no more movement, like the sound of the deadbolt separating from the lock post after the key was inserted into the lock hole and turned.

Li Zimu frowned, and waited for a while before he stepped forward and took out the Tai'a sword in the groove and held it in his hand.

The door has been opened, Li Zimu looked at the gap that parted along the middle of the iron door, Tai'a Jian's appearance has not changed, but the color has changed a little, and it does not affect its role as the key to this door, and the iron door is still opened.

"Hasn't it changed?" Chi Ling asked suspiciously from a distance now, this gap was too small, and it looked the same from a distance as before, so she thought there was no change.

Li Zimu didn't answer her words, put the Tai'a sword aside, put his two hands on the iron door, and prepared to push it in with both hands.

This door is too heavy, just half a door, it also weighs seven or eight tons, although it is piston turning, but it still requires a lot of strength, and an ordinary person will never be able to push it.

"Heh......" took a deep breath, and Li Zimu pressed his hands on the door and pushed it inside with all his might.

After a stalemate of about ten seconds, I finally saw the iron gate retreat back by half an inch.

Zhang Jingyang, who was in the distance, saw that Li Zimu was pushing the door hard, so he threw the backpack to Chi Ling and stepped forward to help, and with the joint efforts of the two, he finally pushed the iron door inside at a small angle, pushing open a gap for only one person to enter sideways.

Fortunately, this iron door is rotated by pistons, Li Zimu thought to himself, if the same weight of iron is placed on the ground and let them push hard, he will not be able to push two more.

Looking at this iron door, it is ten centimeters thick, but some places in the middle are hollow, and the flashlight can still see the gear combination inside, these small gears are combined, and they will have such a wonderful effect.

"Let's go," Li Zimu turned around and took the Tai'a sword and said to a few people, holding a flashlight and walking into the iron gate first. Zhang Jingyang also followed, and Chi Ling took Wang Xueling's hand and walked through the iron gate one after the other.

"How long is this passage...... " The spirit said in surprise as she shone her flashlight forward, and at this time they were already standing behind the iron gate, but the situation in front of her made her feel a little frightened.

It's a channel, a straight channel.

Like the gate, the passage is four meters wide, but it is a little higher than the iron gate, and the upper part is a semicircle with a radius of about two meters, like a modern tunnel.

The upper part of the tunnel in the mountain is semi-circular arc, so that the tunnel can be firmly supported so as not to cause the consequences of not being able to withstand the collapse.

And how long this passage is, they don't know yet, because the distance of this flashlight is only a few tens of meters, and the light will disperse in the back, and then the place behind is still pitch black, and there is no corner wall or anything like that.

"Behind this passage, there should be the Jieshi Underground Palace, right?" Zhang Jingyang shone the flashlight around and said, this direction happened to be repaired straight to the land.

"Let's go" Li Zimu nodded and said, Jiang Nushi is about a thousand meters away from Jieshi Palace, so if you calculate it, if this passage has been built straight all the time, it will be at least a thousand meters long. How much manpower and time is needed to do this kind of project, and only Qin Shi Huang has such leisure......

What will happen later, Li Zimu doesn't know, anyway, it will never be smooth sailing, otherwise it would be meaningless for Yingzheng to spend so much time doing these useless work.

"There are calligraphy and paintings on this wall," the spirit shone the flashlight on the surrounding stone walls and said, it is not strange to see more, the last time I went down to the Overlord Palace, there were murals in the passage, but this time this passage is much larger, this mural is more than twice as large, and the painting is also a lot more exquisite, more than two thousand years have passed, it is still so weird and bright, just like the one just painted. At that time, people liked to paint on the wall when they had nothing to do?

"Han An, could it be Han An, the last monarch of Korea during the Warring States Period, Han An, the king of Han Aboulder?" Zhang Jingyang looked at the mural and whispered, in this painting, a man wearing a high hat with his hands behind his back as if he was tied and kneeling on the ground, behind him stood four people with weapons in the shape of soldiers, and in front of him was also painted a person sitting cross-legged. Only the kneeling person had two small seals written on his head.

"Hmm" Li Zimu nodded and said, Korea is the first step for the Qin State to begin to unify the world, because Korea at that time was already a thin camel, and it was no longer as strong as when Han Zhaohou was in power.

There is Wei in the north, Chu in the south, and Qin in the west, which leads to the narrow development space of Korea, and when Han An ruled, it was already the last strength of the Seven Kingdoms, and it was close to Qin, so it was the first to be used by Yingzheng to open the knife, and became the first stepping stone for him to unify the six countries.

And Han An, the king of Han Waste, was finally captured by Qin Junsheng, this picture should be Han An was escorted by Qin Jun and knelt to see Qin Shi Huang, and the person sitting there should be Yingzheng.

There was only this one picture here, and there was no more to the back, and the four of them cautiously groped their way forward.

"Stand back!"

Suddenly, Li Zimu roared, tiptoed a little, and his body flew back, grabbing Chi Ling and Wang Xueling and retreating five or six meters back, and Zhang Jingyang on the side also quickly retreated at the same time.

I saw that on the originally smooth stone walls on both sides, dense openings suddenly opened, and in each hole there was a long crossbow that shot quickly towards the position where they had been standing.