Professor Huang, who was standing aside, suddenly had a guess in his mind: "Can the shallow water areas in the Yang River form a continent? Can stay on the island avoid the danger of night?"

This is beyond the scope of human experience...

"They should have discovered our plane, right?" Shi Dayong touched his chin and said.

Lu Yiming said: "Not necessarily, our planes are flying at high altitude and low speeds. The sounds they make are hard for ordinary people to hear."

The flight altitude of the anti-gravity aircraft is 20,000 meters, which is difficult to detect with the naked eye.

Of course, people cannot rule it out, because the other party has special means of investigating.

"Even if they detect it, they may mistakenly think it is some special creatures. Occasionally, some mutated living organisms will appear above the Yang River."

People once encountered an oversized bird with a length of 1 kilometer. Both sides met from afar, separated from a distance, and the well water did not interfere with the river.

I have also encountered large groups of fish that are as long as whales, and they harvested many delicious eggs. Scientists even cultivated these fish, but it was a pity that their growth rate was not as rapid as they imagined.

Lu Yiming thought of another question: "If there was a shallow water area and our shelter was opened, there would be a risk of stranding, right?"

If the water depth is less than 300 meters, the chassis of the shelter may hit the submarine continental shelf, which is indeed worth guarding against.

"But no matter what, it is still worth investigating? This phenomenon is too abnormal..." Professor Huang said excitedly: "No matter what, they are still a civilization. Maybe, can we both trade? Yes, trading information and trading items are all good choices!"

"It really makes sense." Lu Yiming also nodded cautiously. He also wanted to contact unknown civilizations and obtain more information.

Maybe these ancient civilizations have picked up the garbage from advanced civilizations?

Even if ancient civilizations picked up advanced technology, they could not use it. They would have to sell it at a low price?

Maybe they know more?

And... the other party was also heading towards the New World. Perhaps, probably... what do they know?

As long as you are careful enough, there should be no problem.

Especially at present, the strength of shelter has once again soared.

Li Yao asked again: "What else have you discovered besides this ancient fleet?"

The pilot quickly said: "After passing through this island, the plane continued to sail forward for more than 1,000 kilometers, about 3,000 kilometers away from the shelter. The instrument suddenly sensed an extremely strong magnetic field, and the magnetic field strength exceeded the safety limit and even formed an electric current on the surface of the aircraft."

"I had to return because of fear of the plane losing control."

When metal cutting magnetic inductive lines, it will generate current, which is the physics knowledge of junior high school.

It is naturally extremely dangerous to generate current on the surface of the aircraft. It is easy to suffer lightning strikes and even static fires.

The other two pilots also said: "Yes, the closer we get to that direction, the stronger the magnetic field will be, and there are large clouds in the air. I don't know what..."

"How is that..." Li Yao thought for a while and nodded slowly: "It's a very safe choice. This time the investigation is very good. You can go down and rest first."

In the next two hours, the captain of the investigation team, Li Yao, carefully wrote a report and submitted it.

Regarding ancient fleets, magnetic storms, continents may exist under the dark clouds, etc.

The news soon attracted the attention of senior government officials.

People organized relevant teams and after detailed discussion and demonstration, they compared the captured data many times.

Finally, he carefully dispatched several pilots to fly the plane, and conducted a high-altitude reconnaissance and obtained more information.

It was also confirmed that the strange fleet was still standing there and did not leave.

After a day of busy work, the relevant contact meeting was officially held at 8 o'clock in the evening.

Ding Yuan read out the fresh investigation report to everyone: "Everyone, after our investigation, we found that this small island belonging to ancient civilization is not the kind of island I imagined, but a...a large floating island, that is, an island floating on the water, it can move!"

"The specific reason why floating islands are formed is unknown, but it is not unexplainable. It may be caused by the accumulation of gas inside the plant roots or peat blocks on the bottom of the water, and some are caused by part of the lake shore leaving the lake shore. On our former earth, there were similar floating islands, but they were not that big."

"So, the emergence of this floating island did not exceed our expectations."

Transforming unknown phenomena into known phenomena is a conventional scientific research method.

Lu Yiming and many scientists didn't know what to say, and he was even a little disappointed. He was actually a little looking forward to getting into unknown products, but the result was just a floating island.

Even if people don’t know how this floating island floated and how did ancient civilizations build such a big floating?

"Let's open it all together... the direction of movement of this large floating island happens to be the direction full of magnetic fields."

"They should know some special information about... New World"

"According to the survey data, this unknown civilization may have scientific and technological information for the first industrial revolution, but due to its population size, it should have just picked up some garbage from somewhere."

When Lu Yiming heard these things, he couldn't help but sigh...

Did you really go back to ancient times?

The product of the first industrial revolution was a steam engine. Even if it was piled on the ground and allowed to be picked up by people at will, it would have no meaning to Yunhai. At most, it was just that the raw materials were of some use.

"The ancient civilization is moving slowly with floating island as the core. The hourly movement speed is about 4 kilometers, and the power system is unknown. They have a total of 15 1,000-ton wooden sailboats, each sailboat is about 45 meters in length and 12 meters in width."

"According to the weight of plants, the total population is about 12,000 to 13,000 people, and it should not be more. The agricultural capacity and fishing capacity of ancient civilizations were difficult to feed more people."

"Including some supernatural means, 14,000 people are the upper limit. The main food rations are corn, sweet potatoes and a small amount of rice."

A 400-hectare island is equivalent to 4 square kilometers and equals 6,000 acres of land. This piece of land is not big or small.

In addition, 15 wooden sailboats can also grow vegetables.

But the people who can support are still not high.

In ancient times, there were not even chemical fertilizers or pesticides, and the quality of seeds was poor. The rice yield per mu was 500 kilograms. If you plant potatoes, the yield per mu might be over a thousand kilograms. Sweet potatoes may be even higher, at 2,000 kilograms.

How could it be like Yunhaihao, with a random yield of 1,000 kilograms per mu. The yield of potatoes can even be three or four thousand kilograms per mu. So if you really travel to ancient times, if you can choose a piece of item to bring it over, you should choose sweet potatoes... This thing has a large production capacity and is simple to plant. Once you contribute it, you can euthanize the emperor.

The reason why population estimates are inaccurate is that people cannot figure out how many animals the other party raises. The food they need is completely different from carnivorous food and plant food.

At the end, Ding Yuan took a deep breath: "This is the basic information. Do you have any opinions to put forward?"

Everyone looked at the information on hand and found that the reconnaissance planes only had these superficial contents detected.

The plants on the floating island are lush, with some sentry towers on the edges and a small house in the middle, which looks like a scene of a small country.

Lu Yiming took the lead in raising his hand and said, "From the preliminary investigation data, this unknown civilization has far weaker war power than us. But we cannot underestimate the other party just because it is an ancient civilization."

"Since the movement direction of the other party and ours is consistent, I think we can contact it with the second level of safety standards."

“We shouldn’t miss this contact opportunity.”

The first level of safety standards is the contact rules when facing extremely malicious civilizations like Nubian civilization.

Under this kind of alert, the two sides are always ready to start a war. Once there is any disturbance, the Yunhai will immediately use nuclear weapons to launch a devastating strike!

The second level of safety standards will be slightly relaxed. The situation of contacting the object is unknown. You may be with good intentions or bad intentions. The military's vigilance may be escalated or downgraded throughout the entire process.

The third-level safety standard is naturally in the face of civilizations with higher kindness, and the two sides can have harmonious contact and conduct a certain degree of trade.

The fourth level of safety standards is to face the entire alliance, conduct academic exchanges and large-scale trade in goods.

The military's security control will also be more relaxed.

These safety standards correspond to different application scenarios.

After Lu Yiming threw the bricks and attracted the jade, more people soon responded.

"Yes, I agree with Mr. Lu Yiming. We really shouldn't miss this opportunity."

"If we want to survive in Yanghe for a long time, we must have more experience in foreign exchange. This ancient civilization seems to be not very powerful, and it is indeed a good contact object."

The speaker was Liang Zhenhui from Hope, who is now the deputy captain. "Not all civilizations are malicious. Like we once met a group of indigenous indigenous people in the frozen world, who taught us a lot of new knowledge."

"And, it will be dark in Yanghe in 3 months. As long as the other party has such a little ability, and does not hide fatal dangers, and is not brainwashed by the evil god... I still tend to hold a group to keep warm."

"They shouldn't be rookie civilization, right?"

"It doesn't look like... they are quite normal in their mental state, and they are obviously used to the living environment of Yanghe."
Chapter completed!