About half an hour away, you can see an ancient city.

Ye Qing had probed it with his spiritual sense, there was no life in the city, and there would be no Professor Gu, Jin Xi and the others they were looking for, so there was no need for them to continue to move forward.

In the afternoon, they returned the way they came.

Before dark, go back outside the low wall again.

"We're back again?" Shelley stared at the low wall, his eyes dry.

Ye Qing said lightly: "We will return to that underground labyrinth." ”

"Don't—" Shelley hugged his head, a ghost crying wolf.

On the afternoon of the third day, the low wall began to react, and the four of them stood by the low wall, and an invisible force dragged them down, because with the first experience, when the four of them fell, there was no situation of stacking arhats.

Similar to the previous day, they walked through a passage and came to a house with a pool.

"Why are we coming back here? Is it okay not to go through the maze? I'm afraid of the dark ......," Shelley looked like he wanted to cry without tears.

Ye Qing took a beef jerky and gave it to Xie Lai: "Don't talk." ”

She stared at the pool, walking around and around again.

Yesterday, she saw an ancient city in one direction to the west.

Actually, there shouldn't be an ancient city there.

Before coming to Lop Nur, Ye Qing had already read the map, and she clearly remembered which places on it were marked with ruins, which places had water sources, and where there was no grass.

From the bottom of the labyrinth to the ground, they did see the low wall, and found two dried corpses outside the low wall, but there was no car they parked here, and at the same time, there were patterns on the low wall that were not there before.

The answer is imminent.

They didn't go back to square one, they came to another hub station.

This should be the place where Professor Gu and the others thought they had returned to the low wall after they had been gone for three days, but the fact was the opposite.

And even if they found another low wall, this place was not the space they were originally in.

Why?

Because Ye Qing saw an ancient city.

When the four of them returned to the labyrinth and saw the pool, she was sure of the bold guess in her mind.

The low wall is the hub station, which is used to teleport creatures or other things, and the labyrinth is the communication line, and there are hub stations on each line, and the exit point of the platform is fixed in a certain place.

And this pool ......

As he nibbled on beef jerky, Shelley asked, "What are you staring at this pool?" ”

"Come here." Ye Qing beckoned to him, Xie Yi leaned over, staring at the water with a focused expression, and in the next moment, she grabbed his collar: "Close your eyes." ”

At the same time, Ye Qing used his spiritual sense to transmit a voice to Shi Yin: "Bring Qi Huaimei, jump." ”

Ye Qing and Xie Lai jumped into the pool, Shi Yin had no choice but to pull her arm: "I'm sorry." ”

The pool was only about ten centimeters high, but all four of them jumped into it.

In a few seconds, the surface of the water returned to its original state without a single wave.

Outside the pool is a layer of yellow mud, about ten centimeters, of which, the upper part of 95 is light water, and the lower part of up to 5 is heavy water.

Light water, that is, ordinary water that is usually used.

Heavy water refers to the combination of heavy hydrogen and oxygen.

Heavy water is mainly used as a moderator in nuclear reactors, which can reduce the rate of neutrons and make it suitable for the fission process to occur. Heavy water is also a material that has been used in the study of chemical and physiological changes. Thick and pure heavy water cannot sustain the life of plants and animals like light water, and its lethal concentration is 6080.

While heavy water is a valuable resource in terms of cutting-edge technology, it is harmful to people.

Humans are not allowed to drink heavy water, and microorganisms and fish will die in a few hours in pure heavy water or water containing a lot of heavy water.

However, light water, which contains very little heavy water, stimulates biological growth.

Ye Qing didn't understand the principle, and the four of them walked through the pool from there, and then fell from the sky.

After two or three seconds of darkness, they fell to the ground, looking at the scene in front of them, and couldn't help but be stunned.

"Am I dreaming?" Xie Lai took Ye Qing's hand and put it on his cheek: "You pinch me, pinch the point!" ”

"Oh my God, we've crossed over!" Qi Huaimei exclaimed in surprise and covered her mouth.

Shi Yin looked at the ancient city at the bottom of the hillside, and said with surprise: "Ancient? ”

Ye Qing retracted his gaze and let a few people walk down the hillside: "It's not antiquity. ”

"Yesterday at noon, we walked west for half an hour, and we could see an ancient city, which was more than eighty percent similar to the ancient city we see now, and the difference between the two was - the past and the present."

"Past and present lives?"

"The ancient city I saw yesterday, there was no living thing in it, the whole city was empty, you see, just outside the city, there is an endless stream of people."

"Why are we here?"

"Because we've crossed over, that pool connects to some alternate plane."

When Ye Qing used the word "crossing", Xie Lai and Qi Huaimei couldn't help but get excited, after all, everyone has only seen the protagonist travel back to a certain time and space in movies and TV series.

"Where did we cross over? Which dynasty is it now? ”

"Maybe it's still in the northwest of China." Ye Qing took two sets of clothes and asked Xie Lai and Qi Huaimei to change them.

After a few people had changed into modern clothes and ancient clothes, she told the two: "Once you enter the city, first, you are not allowed to speak, including talking to yourself, second, you must not touch anything, and third, you must not walk away alone, even if you want to pee, you must be accompanied by me or Thirteen!" ”

"Why? It's hard to cross a trip, how can you strangle our dream of crossing under this broken slope! ”

Ye Qing slapped and beckoned: "We are here to find someone!" ”

Five minutes later, they walked from the dirt slope to the ancient city.

The main road outside the ancient city can be described as full of traffic.

Several ancient Chinese caravans were heading west, the wind blew through the corner of the bamboo strip on the cage, Ye Qing saw that it was full of silk, porcelain, and someone pulled two boxes of ironware, and some blonde and blue-eyed western faces were heading east, ready to enter the ancient city, they led the horses, and carried several large bags on the horses.

Intuition told Ye Qing that the ancient city not far away should be related to the "Silk Road".

The Silk Road was the middle route of Xinjiang, which was called the "Northern Road" in the Han Dynasty. If it is changed to the current place name, it is from Hami through the ancient city of Jiaohe in the Turpan Basin, along the southern foot of the Tianshan Mountains and the Tarim River to the west, to Kashgar, and exit through Tashkurgan.

Among them, Gaochang, Jiaohe, Luntai, Qiuci and Shule are all historical cities on the middle road of the Silk Road.

The ancient city they crossed should be one of the many ancient cities on the Silk Road.

Looking at the scale of the ancient city, it has become lively, and it should be a fortress.

It takes about ten minutes to walk into the city, and along the way, Ye Qing noticed that the plants on the side of the road are very strange, common green plants, almost all of them are black and brown here, and some plants have even become very deformed.

Suddenly, a vulture flew over their heads.

She glanced up.

The vulture is a large bird of prey that feeds on scavengers, generally speaking, it is about 12 meters long, but the vulture that has just flown over can be up to 2 meters long, and it has two pairs of wings!

Ye Qing was puzzled, did they really come to the ancient times?