Yu Yifeng's heart was suddenly happy, and he also heard people's surprise and high-five to each other.

But he didn't dare to slack off, and hurriedly praised the ocean, and suddenly, the little ball spun happily, forgetting the unhappiness just now......

"Okay, now maneuver the unmanned submarine closer to the door...... Slow down, be sure to slow down. ”

An operator nervously controls the submarine and swims towards the target area.

After a few minutes, it passed through the entrance without any incident, slowly exploring inside. Because of the perennial immersion in the sea, you can clearly see on the screen that there are a large number of coral reefs attached to the walls, and in some places they are very narrow.

In fact, the moment they passed through the entrance, the cold hairs of the vast majority of the people stood up, their minds were concentrated to the extreme, and all kinds of weapons were in a state of waiting to be triggered, for fear that some strange enemy would emerge inside.

That kind of hope and worry...... Mixed together, it is difficult to really distinguish between the various emotions.

Even Yu Yifeng sweated...... This kind of complete base may still be sending signals to the outside world! This is not comparable to a Martian flying saucer that has been broken for millions of years!

A civilization with a higher level of science and technology than human beings always has a certain danger......

Even if the other party just left something casually, the civilization level is one level higher, which is equivalent to a huge gap in theory and an unknown ...... The unknown is always scary.

However, after seeing the tattered scene inside, everyone was slightly relieved.

"I thought about it, it's the greenhouse effect!"

“…… It was originally a small hidden island, but due to global warming, it was completely submerged by the sea...... It is estimated that aliens 30,000 years ago could not have imagined this, no matter how clever they were. ”

Dr. Rimbaud had a flash of inspiration and analyzed the specific reason: "You see, there are signs of rotting wood outside, probably trees that used to grow on the island. ”

Everyone was relieved that this was very likely, because the greenhouse effect has only happened in recent decades, and the rising sea level has directly flooded the island......

Some people also optimistically speculated: "Perhaps...... The facilities inside were damaged by seawater? ”

But the good times did not last long, and in the process of exploration, the submarine suddenly saw a thick gate, blocking the way ahead.

There is also a glowing red light next to the gate!

There are no corals left in this area, and it is unusually clean, as if something has just cleaned it. The mood of the people was slightly nervous, and many pairs of eyes were staring at the submarine as it slowly moved forward.

As the submarine approached the gate, suddenly, the surveillance screen representing the submarine dimmed......

In less than 0.5 seconds, it went dark without warning!

"Ahh

A few soldiers who were extremely focused were startled, and the weapon button in their hands was almost pressed. Yu Yifeng's reaction was the fastest, and he immediately shouted: "Don't panic first!" And there is nothing to come out, send a few more submarines over, a few meters apart from one after the other, and see what the hell is going on! ”

The operator quickly entered data on the platform, and soon, five more submarines swam in slowly, controlling a certain safety distance from each other.

…… A submarine began to approach the gate.

In an instant, the screen representing the submarine went black again.

But in the eyes of the submarines behind it, the submarine in front was like that...... Disappeared inexplicably.

Gone?

Yes, gone.

"Try again!"

Another submarine began to approach the gate, and this time, at the moment of disappearance, people finally saw clearly: very close to the gate, the entire submarine turned into a pile of powdery stuff in a few tenths of a second, and then quickly disappeared into the seawater.

The whole process ...... Less than 0.5 seconds!

If you don't use slow-motion playback, it's really hard to distinguish at the speed of the human eye.

Everyone at the scene didn't say a word, and everyone's faces were not very good.

In fact, this situation was also expected in advance, how could a normal alien research base have some defensive facilities......

After all, there are indigenous people or other creatures on this planet, and defense facilities are still necessary.

"I just didn't expect it to be so weird."

There was no need for Yu Yifeng to give orders, and several experts immediately went into action, trying to zoom in on the entire captured image to figure out why the entire submarine had been broken down into powder.

But it's a pity.

There is nothing in the image...... The submarine seemed to have been inexplicably disintegrated at that moment.

"Is there some kind of decomposition light? Or is it chemical decomposition? I think it's more like a physical decomposition ......"

Everyone present was pondering and meditating, and finally Yu Yifeng said categorically: "If you really can't do it, send a few more submarines to test and test the difference in the composition of some seawater in the area......

"If it doesn't work, bomb it with a nuclear bomb, let's hurry up and act! We don't have much time! ”

In fact, without him saying it, everyone quickly took action.

But as a last resort, people don't like to use nuclear bombs, and if you blow up the contents of it, people will come in vain, and this precious clue will be wasted.

And Yu Yifeng jumped into the kayak again, trying to communicate with "Ling", and suddenly the little green ball kept beating happily......

Over the next half hour, the scientists tried several more times, and each time the submarine was quickly broken down into tiny particles that were difficult to detect with video equipment.

"It's strange that the surrounding sea water is missing certain elements, especially metallic elements such as iron and magnesium......"

"The approximate safety range is here...... It's about two meters from the gate! It's very dangerous to get any closer! ”

"There must be something hidden in the sea, but we can't see ......"

In this situation of constant attempts and to no avail, many researchers are slightly tired in their hearts, and the palms and backs of their hands are covered with sweat.

This kind of exhaustion is actually caused by psychological shock, but they are still trying to persevere.

The soldiers are also on high alert, all kinds of weapons are in a state of readiness, and even the spacecraft is in a half-started state, in case of any huge risk, they will immediately counterattack.

After a few minutes, the scientists finally came up with a few conjectures......

"A nanobot with the ability to replicate itself, confined to a distance of about two meters from the gate...... Is that so? That's what you're guessing? Yu Yifeng looked at Dr. Lan Bo and asked directly, "Aggressive nanobots...... Is there any way to crack it? ”

Dr. Rimbaud frowned and shook his head slightly: "The defense mechanism of this nanobot...... Truth be told, we don't have such dangerous technologies, and we may need some kind of special signal to avoid their attacks. ”

"I suspect that the red light is ...... Or something inside the gate, it's the nanobot controls! It can take a long time to decipher these signals...... Moreover, we don't have enough cracking equipment either!

"The industry on this planet is too poor and needs enough time to ......"

"How about blowing up the traffic lights or the gates?" Yu Yifeng asked.

Rimbaud shook his head in disbelief: "No, it's too dangerous, Captain...... This kind of self-replicating nanobot is a very, very dangerous thing, an absolute 'black shell' level technology! ”

"Maybe after blowing up this signal light, they lose their program constraints, and not only will they not fail, but they will start to replicate endlessly......"

"You know, if it grows exponentially, over time, there will be more and more nanobots on this planet until one element is exhausted...... Once the flood spreads, it will be difficult for even us to prevent such catastrophic consequences. ”

“…… If the signal light is blown up, it may be a crisis of annihilation! ”

Hearing this, Yu Yifeng frowned.

This weapon they used to discuss.

Nanobots, whose volume is also at the nanoscale, are most characteristic that they can replicate themselves like cells.

But they are much smaller than cells, and with enough raw materials and energy, nanobots will grow exponentially in an endless number of replicates.

1 nanobot, 10 split replications, can reach 1024, 20 split replications, can reach a million...... Along the way, with endless replication, they will kill almost all living things and decompose everything, because biological cells also have elements such as iron and magnesium in their bodies.

These elements will be forcibly extracted as reproduction materials.

Without the necessary elements, of course, the cells will die immediately, and the whole organism will look like it has been inexplicably disintegrated.

Nanobots, world-destroying technology, are 10,000 times more dangerous than nuclear bombs!

Thinking like this, Yu Yifeng's heart beat faster and beat a few times, and a cold sweat broke out on his back......

Damn, this high-risk weapon is just left at the door...... There's something wrong with these damn aliens, right?!

Or...... Find another place to dig in? Do not enter the laboratory through the gate and break the perimeter walls......"

Dr. Rimbaud immediately shook his head: "No! These walls are all high-strength metal, I don't know how thick they are...... Unless you bomb it with a nuclear bomb or a high-explosive bomb, you can quickly smash it apart...... The large cutter is estimated to take a day or two. ”

"Is there a way for Ling to do this kind of metal that is too hard?"

(The following is anti-theft...... ）