Humanity stopped.

Cheng Lin was surprised to see that people stopped digging down after reaching a certain depth underground, probably because this depth was no longer cold, and then they began to expand horizontally, and the scale of the entire underground city was rapidly expanding.

"From vertical to horizontal, is it to recuperate and develop productive forces, right?"

Cheng Lin thinks that during the excavation period, the main consumption is the food accumulated on the surface, and the establishment of underground cities requires more diverse energy supplies and food sources, which is a difficult problem that human beings need to overcome.

There are no details in the picture, but through the overall macro control, Cheng Lin is pleased to see that the underground city is gradually prospering, and the population seems to have finally stopped the downward trend and began to rise slowly.

At this time, the overall structure of the entire underground city has been very complex and chaotic, people have gone through the initial hasty, desperate excavation, and now finally began to seriously transform the living environment, which reminds Cheng Lin of the "inevitability of history", such as pollution first and then treatment, first economy and then culture and other items, and today's dungeon residents seem to be carrying out this transformation.

During this period, there seemed to be some changes in social formations, and Cheng Lin found that during a certain period of time, people stopped working and began to fight, even if he could not see the specific situation of the struggle, but the overall situation was very clear.

"At first, everything was about survival, and I didn't care about anything else, but now I'm starting to gain a foothold, so the social structure is changing."

Cheng Lin was not surprised by this.

From the ground to the underground, this is only a simple change in the mode of survival, science, and production, which is the most obvious change, and the more hidden change lies in the fragmentation of the whole world and the destruction of the original order.

"For example, one of the serious problems is information isolation, after the world is frozen, people in various regions invariably go underground, so the big structure of global information communication has been devastated.

Originally on the ground, since the Age of Discovery, the global exchange of information has completely ended, and each dungeon is an independent entity.

Information is blocked, trade is stopped, and at most there is limited communication with a few surrounding dungeons, which is bound to cause a kind of regressive impact on the form of human society. ”

Cheng Lin floated in the air, lonely in front of the huge "ice ball" in front of him, muttering to himself.

This change in shape may also breed new ideologies...... However, these could not be seen with his eyes, and he could only guess secretly.

However, the overall transition is still relatively stable, which is good news, Cheng Lin is really worried that human beings have survived the cold winter and died in infighting.

Eventually, the horizontal expansion of the dungeon also stopped, and several passages touched the veins and underground resources, coal, geothermal, ore, underground rivers...... They even started to cultivate underneath plants.

A real underground city emerged.

Then, Cheng Lin found that humans began to build a channel to the surface in reverse, mainly to stabilize the ventilation holes, the oxygen content in the underground is low, and the ventilation holes must be dug to keep the ventilation smooth, but the ventilation holes are often buried by wind and snow, and someone must be stationed to clean them.

Thus, surface "observatories" based on vents were established.

"Is it a mountain to use?"

Cheng Lin was surprised to see that the observatory was not built in the city, but was dug through a tunnel that led directly to a nearby mountain peak.

"To put it simply, it is to hollow out the inside of the mountain peak and open a hole on the side of the mountain, which can ensure the safety of the air hole to the greatest extent and not be blocked, and at the same time, it also provides enough living and storage space for the observation station, as well as the height of the observation field of view."

Cheng Lin quickly realized the intentions of the human race.

It's a smart thing to do.

"And snowmobile......"

After Cheng Lin saw that the observatory was established, a strange snowmobile appeared from the snowy mountain, driven by a strong cultivator and began to carry out short operations on the surface, exploring the surface, collecting and transporting materials, drawing maps, etc.

"Humans still don't give up on the ground."

Cheng Lin sighed.

However, such exploration was ultimately limited, and the main job of the observatory was to maintain the ventilation holes and try to re-establish radio-based global communications...... The blizzard and the restless aura between heaven and earth made it very difficult for communication signals to propagate, and the radio weakened very quickly, and could only communicate within a certain radius.

On top of that, it is to faithfully record changes in surface air temperature every day, trying to wait for the day when the world "thaws", hoping that the glaciers will melt and return to the surface.

Nearly the same process has been played out in dungeons around the world, and as a result, observatories built on mountain peaks have been erected.

There was no communication, no communication, but all underground cities made the same decision.

It's not hard to understand.

"Probably...... All human beings, in their hearts, yearn to return to the earth. ”

……

……

Cheng Lin found that his perspective ability was gone, and his body also fell rapidly.

"Has the acceleration of time stopped?"

He thought to himself, unleashing his grip and letting himself fall smoothly to the ground.

"Poof."

When his legs touched the ground, he instantly fell into the snow due to gravity, and his whole body was buried.

"Transform!"

He was slightly stunned, waited for a while, confirmed that time was no longer speeding up, turned his whole body aura, and spit out a word.

In an instant, two fireballs appeared around his body.

The low-temperature fireballs were no longer suitable for Cheng Lin to fight, but they were still very comfortable to support, and the two fireballs quickly melted away the snow and spun around his body rapidly.

Soon, the snow within a few meters of Cheng Lin's side was melted.

"Receive."

Cheng Lin removed the fireball with a wave of his hand, and stood in an almost perfect circular snow pit looking up at the sky.

Today's weather is exceptional.

It's still cold, but the sun is shining, the sky is exceptionally clear, and the world is very quiet.

The world is extraordinarily bright.

It was caused by the snow reflecting the sunlight, and the atmosphere had been damaged, but the condition was okay, Cheng Lin took a deep breath, and the cold air entered the lung tube, making him shiver subconsciously, as if he had drunk a large sip of ice water in the hot summer, and the pores all over his body had shrunk.

"If you don't have the property of repelling cold, I'm afraid it's not just a stimulus, it's a pain." Cheng Lin thought.

[Fifty years have passed, and the remaining human beings in the world have turned thousands of meters underground to start a new life, and a new ecology has already been formed on the ground]

[The blizzard killed most of the creatures, but in the end, some creatures that were good at resisting the cold survived and began to multiply]

[The appearance of the cold wave is accompanied by a more irritable and rich aura, which makes many plants take the lead in mutating, becoming extremely cold-tolerant, with extremely deep roots and veins, suitable for surviving in glaciers and snowfields]

[With plants, animals have a source of food, and the violent aura and cold have prompted the rapid transformation of global creatures in a few decades, the cruel living environment has brought opportunities, and the creatures living on the surface have begun to usher in a large-scale awakening, with stronger physique, combat power, and moderate wisdom, almost all the creatures that have not awakened have died, and the surface creatures have ushered in a new round of reshuffle]

[Because of burrowing into the ground, human beings have retained more population, but at the same time, they have lost the opportunity to awaken on a large scale, except for a small number of human cultivators, most of them are still ordinary people]

[The world has formed a new ecosphere, and this time, humanity has finally lost its position as the master of the ground]

Information comes to mind.

Cheng Lin walked out of the snow pit while reading, the ground was not soft, except for the soft snow layer of tens of centimeters on the most surface, most of it was hard ice.

This allowed him to walk smoothly on the desolate and cold surface.

"Sure enough, there is a new ecology."

Cheng Lin stood on top of the frozen soil, dusted off his clothes casually, and looked into the distance, and saw that there was a forest on the snowfield, and those trees were all pitch black, very wide, and stretched, as if they were trying their best to absorb the sun.

The appearance is distorted and insolent, probably because no one looks at it, so it grows very casually and ugly.

He was amazed at the rest of the black, red, orange and strange grasses, and even some of the fruits, which were so vibrant.

"I thought the world would become extremely desolate, but I didn't expect it...... Life is always adaptable...... Of course, those who don't adapt are eliminated. ”

Cheng Lin walked over.

It is natural to feel the rich fire element on these black trees.

"These trees are also spiritual plants that have been transformed by spiritual energy, but in the past, the spiritual plants in my consciousness referred to grass, flowers, or fruits, and the entire forest was spiritual plants...... It's really rare. ”

Cheng Lin touched the dark, strange-looking trunk and looked around, but found no trace of the animal.

"What about animals? Doesn't it mean that there are many awakened animals alive? ”

He asked curiously.

[Open the task system, please follow the prompts to complete a series of tasks, and after completing the deduction, you will get a reward]

[Mission (Part 1): In order to find food, a group of snow beasts has begun to migrate, and they are about to enter the underground city area where you are located, you need to rush to Observatory 5 and tell the garrison the news]

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