A civil airliner is flying at an altitude of 10,000 meters.

From Beijing to New York, Cao Yusheng inquired about the route information and deliberately selected this plane.

The map is flat, while the earth is round. The route of the aircraft needs to consider a variety of factors, and it is not as simple as two points and one line.

The international flight chosen by Cao Yusheng took the Arctic route.

The flight route, which looks like a high-throw curve on the map, starts in Beijing and heads north, passes the Arctic Circle, and ends at JFK Airport in New York.

The reason why this plane was chosen is that it will land once in Khabarovsk on the bank of the Heilongjiang River to pick up some of the guests.

Therefore, Cao Yusheng was able to take a look at Heilongjiang from the air.

At this moment, the plane has fallen into the clouds, and this winding river has appeared outside the window.

From the air, China's third-largest river is as calm as ever.

It was September, the earth was in autumn, the river was black, the banks were yellow, and it was a bleak scene.

Although Cao Yusheng had long expected what he saw in front of him, when he really saw this river, the thoughts in his mind were far less calm than those of the river.

The dragon city under the Heilongjiang River, he traveled all over the Northeast thirty years ago and collected some information.

It was all some folklore, which he wrote down into a thick notebook, and there were some speculations he made in combination with historical materials.

It's a pity that fifteen years ago, the Cao family suffered an accident, and a fire turned this notebook into ashes.

Now, with the memory in his mind, this Black Water Dragon City should be established in the "Shizhang Prosperous Era" period at the peak of the Dajin Dynasty.

That is, the reign period of Jin Shizong Wanyan Yong and Jin Zhangzong Wanyan Jing, from 1161 to 1208 AD.

Influenced by Han culture, the Jurchen people believe that the Chinese dragon vein originated in Kunlun and is divided into three branches, namely the Southern Dragon, the Middle Dragon and the Northern Dragon. And the Great Xing'an Mountains and the Outer Xing'an Mountains happen to belong to the North Dragon Vein.

During the reign of Jin Shizong Wanyan Yong, there was a huge space under Heilongjiang that was discovered by the mountain people and reported to the imperial court.

Wan Yanyong thought at that time that this place happened to be located in the North Dragon Dragon Vein, and the landform was very peculiar, which was the "land of dragon prosperity" given by God to the Jurchen.

So the emperor decided to build a huge underground city on the dragon vein, with a dragon protection array in it, to suppress the dragon vein, so as to protect the Jin Dynasty for thousands of generations.

This city is known as the "Black Water Dragon City".

At that time, how many people and how much money were used, Cao Yusheng did not know, but it can be vaguely seen from the legend that it was almost the power of the Dajin Dynasty.

In history, there are actually many people who have lost their country because of this kind of thing, such as the Great Wall of Qin and the Suzhou-Hangzhou Grand Canal of the Sui Dynasty.

Although this kind of large-scale project was successful, it was unbearable for the productivity at that time.

In terms of nature, Heishui Dragon City is different from the Great Wall and the canal.

The Great Wall and the canal are national projects with practical functions, among which the Suzhou-Hangzhou Grand Canal is still playing a role today.

The Black Water Dragon City only represents the secret ambitions of the two emperors, and there are no monuments to hang on or value to cash, so there are only some sporadic legends left so far.

Thirty years ago, Cao Yusheng traveled all over the Northeast, and with his ability at that time, he could only know so much.

And now, Miao Guangqiyuan is in the United States, but he claims to have found Blackwater Dragon City.

This is obviously abnormal, and this abnormality makes Cao Yusheng vigilant.

Although the two have not seen each other for nearly 30 years, and the contact has become less and less over the years, Miao Guangqi has always been very impressed by Cao Yusheng.

Cao Yusheng had to admit that even if there was a blowout of hunters thirty years ago, and there were heroes like Lin Leshan, Zhang Lianhai, Su Tongji, and Yun Yuexin, he Miao Guangqi was still the brightest among the stars.

Even Lin Leshan, the leader of the Hunting Gate later, before the duel began, the evaluation of the Hunting Gate was not as good as that of Miao Guangqi.

It's a pity that in that duel, Lin Leshan defeated Miao Guangqi with the arrogant and unreasonable "Three Absolute Martial Arts".

Since then, Miao Guangqi has been a little incomprehensible to Cao Yusheng.

After staying with him in the Northeast for a year, Cao Yusheng faintly felt that this person was no longer a deep friend, and the two of them separated from each other.

This time, what is the intention of this second brother to let himself go to the United States?

Cao Yusheng withdrew his gaze from the window and closed the window panel.

......

Underground, the mechanism in the urn city of the Black Water Dragon City blocked Lin Shuo and the four of them from the city.

Lin Shuo didn't know who built this city, but one thing was for sure, the family was very rich, and they had invested heavily here.

Judging from the weathering of this city, it is at least more than five hundred years, and Lin Shuo originally felt that after so many years, the mechanism on this wall may have failed.

As a result, he threw a stone into it, and the crossbow arrows in all directions immediately filled the passage space of the urn city.

The crunch of the arrow breaking through the air sounded chilling to the bone.

And the mechanism here is also very cleverly designed, and the crossbow arrow on the left will shoot right into the wall on the right.

After more than 500 years, the mechanism can still be triggered effectively, and the sensitivity is excellent.

This trap alone is already worth a lot.

Lin Shuo looked at Wei Xingshan, who was silent beside him, and asked, "Old Wei, what do you think?"

"Hey!" Wei Xingshan smiled bitterly, "Why don't we go back?"

Lin Shuo ignored him, but looked at Yang Tuo: "Dr. Yang, do you analyze and analyze?"

"The trap was supposed to be a weight-triggering mechanism, and it was designed to be recyclable, which meant that the trap wasn't a one-off. Yang Tuo pondered his words, and then shook his head, "Unless we can fly over, there is no solution." ”

Lin Shuo thought for a moment and said, "What if we don't crack this set of mechanisms, but just destroy it?"

"Then destroy its recyclable system. Yang Tuo lifted his glasses, "Crossbow arrows can't be endless, as long as they can't be recovered, they will always shoot out." ”

Lin Shuo nodded and glanced at Wei Xingshan beside him: "The doctor's brain is indeed stronger than that of a soldier. ”

As he spoke, Lin Shuo moved his body slightly.

This wall, which Lin Shuo observed when he opened the door just now, is five or six meters thick, and it looks like a stone brick on the outside, but I don't know what is inside.

If you want to destroy this kind of wall at once, since it is Lin Shuo, you must also weigh it.

But at present, it seems that only Lin Shuo himself can complete this matter.

"The doctor has a good brain, but the doctor can't use it. ”

I only heard Wei Xingshan say as he took out a bundle from the backpack behind him*.

Lin Shuo was stunned for a moment, looking at the * in Wei Xingshan's hand, his eyes were a little straight.

Wei Xingshan saw Lin Shuo's expression, and didn't feel that there was anything wrong with it, but felt that he had more face, and said proudly: "I brought three bundles of this thing when I came out this time."

I'm telling you, this thing is awesome, and you'll have to step back a little bit later.

Don't worry, I know what Lao Yang meant, isn't it just to blow up one of the walls, and the arrows on the opposite side can't be recovered.

And then the arrows on the opposite side are shooting, and there will always be a time to shoot, and then we will be able to pass the ......"

As he spoke, Wei Xingshan noticed that there was something wrong with the other three people looking at him.

"No, why are you looking at me like this?

"Did you say it earlier?" Lin Shuo only felt that an evil fire was rushing upwards in his heart.

However, he still controlled himself, because he knew that if he really made a move, Wei Xingshan would have to break it.

Anne said helplessly: "Captain Wei, we have been touching the root of the wall for a long time, and we are also studying how to open the city gate and how to crack the mechanism. If you had taken the * out sooner, we would have been able to blow up the walls and go in. ”

"That's right!" Wei Xingshan patted his head, and then pointed at Lin Shuo, "It's up to you for this." ”

"Rely on me?" Lin Shuo was angry, "Why?"

"With you as a monster, isn't everything settled by you?" I didn't remember that I still had *!" Wei Xingshan said confidently, "It's up to you to do this, because you're too strong!"

Lin Shuo was stunned, and he didn't know how to refute it for a while.

Yang Tuo sighed and reminded, "Captain Wei, don't waste any more time, let's do it as soon as possible." ”

"Good!"