Sure enough, after the middle vehicle turned off its engine, the black worms gradually abandoned it and stopped attacking.

Even the black worm that had been parked in the car slowly flew away.

Yu Yifeng suddenly breathed a sigh of relief in his heart. It worked, and these damn bugs are attracted to heat!

Looking out the window, insects are constantly emerging from caves in all directions, like a pile of black, wriggling deserts, like the scarab beetle heaps in the movie. This is a terrifying number, and people with dense phobias would probably be scared to death.

The 100 people hiding in the car were also related, and they were so frightened that they didn't dare to move at all. It's a good thing that there is this refuge, otherwise, maybe everyone will suffer misfortune.

The insect tide was like crazy, all of them flapping their wings, and they were constantly rushing in the direction where the flight base fell.

The reason for this is all because of heat energy!

The engine of the downed spacecraft is in a period of rising temperature, the core temperature is several thousand degrees, and the sodium vapor is even burning continuously! At the same time, another water-cooled unit emits a large amount of high-temperature water vapor.

The heat brought by this nuclear engine can be much higher than a few incendiary bombs, which is why this group of things is frantically attracted to it......

In the tracked vehicle at the front, some people are mourning in silence for the deceased, especially the relatives and friends of the deceased, immersed in an atmosphere of grief and pain.

There were also whispers of discussion, frowning and meditating, trying to solve the crisis in front of them.

How did such an underground ecosystem come to be? Why do insects produce strong acids? Why do they have such strong thermotaxis?

Time passed minute by minute, and an hour and a half passed in the blink of an eye, and the insects outside were still in a steady stream, showing no sign of decreasing, and Yu Yifeng's heart became more and more anxious......

Their time is not unlimited, and it is clear to all that the nuclear engine will explode in a few hours.

No...... Six hours to be exact! At such a close distance, they will definitely be affected by a nuclear explosion!

It's still too close, and I haven't walked a few kilometers in total, so it's not a very good choice to eat a nuclear bomb.

"How's it going, professors, have you got any results?"

Yu Yifeng asked anxiously: "I don't know how many of these damn bugs there are, we can't wait indefinitely!" Gotta find a way to get out of here! ”

A biologist whose power armor was burned black by the fire and escaped from the pile of insects was stunned, and then said with some fear:

"After discussion, we agreed that thermal energy is the main source of energy for the underground ecosystem! Just like light is to plants! However, the scarcity of geothermal heat is not as abundant as that of light, which also leads to the general aggressiveness of the creatures here. ”

"Only aggressive creatures can occupy the best places."

"And our power armor will also release higher heat, especially the heat dissipation area in the lower right, which is at least forty or fifty degrees, so it will be attacked by them!"

Yu Yifeng nodded, he touched it with his hand, and the heat dissipation area in the lower right was indeed the most corrosive.

And the fact that bugs don't attack cold tracked vehicles also indirectly proves this.

Heat is the only thing that attracts them!

The biologist thought for a moment and continued: "Based on various phenomena, we suspect that these huge underground caves are corroded by the acidic liquid of the black worm! Because the deeper the cave is corroded, the closer it is to the geothermal heat! ”

"Just like all plants on the earth have a phototropism and will involuntarily grow in the direction of light, these underground creatures have an instinctive thermotropism! Geothermal means a stable source of energy, which is why they will flock in the direction of the spaceship! ”

"It's a hot area, maybe they mistakenly think they've found a new geothermal source......"

Yu Yifeng nodded, he wanted to ask about other more important things, but he still suppressed his impatience and continued to listen.

The biologist picked up the carcass of a bug and said, "As for the acidic liquid in their bodies...... We suspect that it may have evolved to corrode the rocks underground, and that it was the result of natural selection! ”

"Rocks hundreds or thousands of meters deep underground, because of the ultra-high pressure, are usually extremely hard, such hardness is not the surface of the soil, it is too difficult to make a hole! Especially when encountering large rocks...... Moreover, it is impossible for these insects to have a large drill like a human and to cut through rocks. ”

"Only through generations of acid corrosion can we go further! Lower, closer to underground heat! Heat is their life! ”

Speaking of which, it seems that the scientists have forgotten the thrill just now, and have become a little shocked, excited, and fanatical.

Life is so amazing that Darwin's theory of evolution has been verified again: the fittest survive, the unfit are eliminated, and under the cruel natural selection, there will always be more tenacious life.

There is no sun here, only geothermal heat!

The result is a group of strange creatures that can make perfect use of geothermal energy!

To get closer to the geothermal heat, they burrow, corrode, dig in the ground, and do almost anything......

Only by relying on geothermal heat can we survive! This is truly cruel natural selection, much harder than the environment on Earth!

"So...... Their acid works particularly well with our helmets. This is an acid that has been specially corroded by rocks after hundreds of millions of years of evolution! ”

I see, that's a good explanation......

The helmet on his head is made of nano silica plus some organic additives, and no matter what, it also has silica components. So I can't eat the corrosion of black worms at all.

Another scientist took over the topic and said with some fanaticism: "We guess that these black bugs can even directly absorb heat energy and synthesize organic matter in areas with higher temperatures?!" ”

"Maybe...... They can replace plants as producers! An insect producer that can replace plants? No...... This is just conjecture and requires anatomical studies. ”

"When they absorb heat, they habitually use some of their energy to synthesize acidic liquids, and then slowly erode away this part of the rock, digging deeper into the cave...... The corrosion accumulated over the years, combined with the erosion of the water flow, has formed such a large-scale karst cave! ”

"And I just discovered that this acidic mixture of melted silica can form a much harder rock when it solidifies! This re-solidified rock is extremely hard, so there are fewer cave-in events! ”

"Yes, it must be like this!"

With this said, the first unsolved mystery was solved.

The caves underneath the entire planet are corroded by black bugs, which is incredible!

Such a huge project has covered the underground cavities of the entire continent, and even humans can't do it, but it was done by small insects.

Maybe...... They took tens or even hundreds of millions of years?!

Everyone was thinking in a daze, even Yu Yifeng was stunned, this was the shock of life......

As well as great!

In the previous environment, this is a great achievement that cannot be imagined! The eight wonders of mankind, do the total amount of work add up to one hundred-millionth of the underground cave?

After a long time, Yu Yifeng came to his senses and remembered the matter: "Professors, is there any way to keep the insects from attacking us?" It's been too long, we have to get out of here! ”

The expert wasn't very sure, but he still said: "Heat, in the end, it's still heat, we'd better not let the power armor emit heat, they won't dock and won't attack!" Maybe that's it! ”

"They're definitely creatures that repel the cold!"

Don't let the power armor emit heat?

Yu Yifeng frowned and thought hard, what can be done? Is it impossible to take off the power armor!

The power armor on people's bodies can't be turned off like a tracked car. If the energy system is shut down, the various livelihood facilities will not be discussed for the time being, and people will not be able to move in tens of kilograms of iron clothing......

But the activation of the power armor will inevitably emit heat, and then it will be attacked by the insect tide again!

What a dilemma!

If only there was a spacesuit, but not either...... If a small number of bugs dock up and secrete acid, the spacesuit will be damaged immediately.

Isn't it possible to paste a layer of mud on the power armor?

Preferably something that cools down!

Yu Yifeng and the others pondered and meditated, what could be done to cool down?