The destroyer circled several times on the edge of the island.

In addition to all kinds of messy biological potions, humans have also invented various strange instruments, which can measure ether values, mental strength, etc.

As long as there is a certain supernatural phenomenon hidden on the island, it is easy to discover it.

This powerful reconnaissance ability has long been different from the past.

What humans fear most about Yunhai are actually not monsters, but disasters in various physical senses, such as the sudden turn of the atmosphere into a toxic gas, which will cause lesions to die once breathed; or some kind of super microorganism appears, or even bacteria and viruses that can't be resisted by strengthening humans, etc.

If such a disaster really happens, with the ability of the Yunhai, there is no way to resist it, so I can only escape in shame.

On the contrary, strange phenomena such as monsters are not very scared...

No matter what, with the condition in hand, I have the confidence to face it head-on.

Now even the grassroots militia have begun to use the first generation of strengthening potions, and their strength has been greatly enhanced.

At least, the monster level of the once White Mist Continent can no longer stop the exploration of Yunhai.

In this way, time slowly passed, several drones walked several large circles in the air, took many photos, but did not find any danger.

After that, several members of the exploration team wearing A-level reinforced suits and more than a dozen scientists wearing power armor carefully boarded the island.

People first checked the sea water here to check its composition.

"How is it?" Lu Yiming asked.

"Sodium ions, potassium ions, magnesium ions, etc. were detected, and the seawater composition here was similar to that of the earth." The scientist replied: "No special toxicity was detected in the seawater, nor was there a fluctuating ether value."

"So, the sea water should be normal."

"Oh, by the way, there are a small amount of residual traces of bisp-chlorophenyltrichloroethane... which means that people here have mastered a certain degree of chemical manufacturing ability, and this substance does not exist in nature."

"What is this? What is the use of double chlorine...?" Shi Dayong asked curiously.

The scientist smiled and explained: "A chemical substance commonly known as DDT was widely used in the earth's civilization in the middle of the 20th century. It had a very good effect. It eliminated malaria and saved at least 500 million people, which could be considered a certain contribution to human civilization."

"However, this pesticide is no longer used in our country because it has a certain carcinogenicity, is not easy to decompose naturally, and is easily gathered into the human body through biological chains. However, in underdeveloped areas such as Africa, it may still be used. This pesticide has a very good effect on mosquitoes and is very cheap. If you change a pesticide, it will not be afforded in underdeveloped areas."

"So that's it." Lu Yiming touched his gas mask.

He suddenly remembered the news that he had seen in elementary school that "chemical pesticides pollute Antarctic" and that was just DDT.

Compared with human life safety and environmental safety, which one is more important is actually a very complex topic.

Many things have pros and cons. It is actually unwise to think in black or white.

He quickly shook his head and abandoned these random thoughts.

After a while, people found some traces of plastic and some chemical fiber substances on the beach.

Plastic was invented in the early 20th century of Earth civilization, and chemical fibers were invented at the end of the 19th century. In other words, the indigenous civilizations here have at least higher scientific and technological strength than these two time points.

After carefully collecting these residues into the glass box, Lu Yiming couldn't help but sigh, what does human beings mean to the whole world? Is it a bacterial virus parasitizing above, or an environmental destroyer in a simple sense?

Even if humans become extinct, the traces left by them still exist and can be easily discovered.

Another older scientist suddenly said: "We have detected another important information. The natural radiation level of the air here is relatively low, that is, the level of Co-60 is much lower than that of the earth, so we suspect that humans in this world have not invented an atomic bomb."

"So according to the above traces, I guess that the technological level of this indigenous civilization will not exceed the technological level of civilization in the 1940s, that is, on the eve of World War II."

"Now, just detect the air, can we detect whether there has been a nuclear bomb in this world that has exploded?"

"Yes, it is true. As long as the era of civilization extinction is not too long, it can be done."

Some factors in a world where nuclear explosions have occurred are fundamentally different from those where there is no nuclear explosion, such as the radiation background in the air.

There was once an expensive material on Earth called "low-background radiation steel", mainly to salvage shipwrecks before World War II.

Because of the large-scale nuclear tests after World War II, the concentration of radionuclides floating in the air was many times higher than before World War II, so the steel refined in this way would have higher background radiation.

This background radiation takes hundreds of years to slowly eliminate.

When everyone heard that humans in this world had not invented an atomic bomb, they all breathed a sigh of relief.

Even though supernatural science is constantly improving, nuclear bombs are still the strongest weapon of Yunhai. With this killer weapon, many things that are difficult for superpowers to accomplish can be easily solved.

"Our engineers are transforming five atomic bombs into more powerful hydrogen bombs?"

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"Yes, the power of atomic bombs has an upper limit, while the power of hydrogen bombs has no upper limit. In addition, we have talents in this area, so it is not too difficult to transform. In addition, there are powerful crystal-energy cannons that can replace these super weapons to a certain extent."

Everyone carefully discussed, searched for effective information, and captured many insect specimens and put them in the glass box.

So what is the disaster in this world?

Nothing was found strange about the animals and plants on the island.

There are also some ordinary lives.

Small animals such as insects and crabs are very active, which is very conventional species, and there is no place for plants to mutate.

"Coconut tree, there are a few mature coconuts here..."

It took me half a day to circle the island, but I didn't find any suspicious points.

"It seems that you still have to go deep into the mainland to discover more information."

After reaching this conclusion, Lu Yiming couldn't help but sigh, knowing that things would not be that simple. However, being able to eliminate disasters such as soil, water sources, plants, insects, etc. can be considered a small gain.

"If there is no disaster in this island, can we live directly on this island? It would be nice to have an extra 1 square kilometer of place."

"Not as simple as you think?!"

Zhong Peng shook his head and thought for a while, and suddenly said, "It won't be another periodic disaster, right? Now the world is in a period of calm? Come again?"

Lu Yiming shook his head: "It's hard to say... Anyway, it's all right for us to hold on to it."

The exploration team returned to the destroyer with the collected samples, and many scientists began to further organize the samples.

Lu Yiming and others sat in a room and talked with the Yunhai Base Camp through remote meetings.

Let’s sort out what we observed today.

"Dear comrades from the expedition team, good afternoon. Here are some important information to share with you." Ding Yuan said in the video: "Our drone went deep into the mainland 800 kilometers, took a lot of photos, and found that this civilization was completely in a state of silence..."

The photos show factories, farmlands, forests, cities, and streets.

"No living people were found in the photos! No large animals!"

Deadly silence.

Lu Yiming's breathing gradually slowed down and his brows frowned.

Ding Yuan said: "So, there must be a major disaster here. And the disaster will inevitably affect small islands above the ocean."

"The humans here are not fools. If living on an island can survive disaster, they will definitely relocate to the island, right?"

"But now that this has not happened, there are no one living on the island, either they are fools or... you must have left some important information."

“It makes sense.”

Everyone on the destroyer was shocked and looked at the small island outside the window. Will people die if they live here?

So, what exactly was missing?

Everyone is racking their brains to think, such as periodic disasters, or some other reasons.

According to current research, superpower, as a spiritual power, must also follow some basic laws. For example, its appearance will definitely be accompanied by fluctuations of the "ether value", which is almost an iron rule!

Without the help of "Ether", superpowers cannot appear for no reason.

But people did not detect any ether value on the island at all...

After thinking about it for a long time, I really found some strange places!

An expert on the Yunhai said in the video: "I found a very important point."

"In this world, we have observed many insects, plants, and a large number of fish, but we have not observed small mammalian animals and birds in this world. Does this indicate anything?"

"Military drones have been flying in the sky for so long, and have never been found, not just birds, but monkeys, dogs, cats, and humans on land have disappeared."

Lu Yiming's heart suddenly moved. If there were only no birds near the island, it would be nothing strange.

But there are no birds in the entire continent, so there is only one reason... The birds were destroyed!
Chapter completed!