That night, Lu Chen returned to the shelter, this time he didn't get much out of it, after all, because of the policy of the Dragon Kingdom and the cohesion of the nation, a large part of the materials in the city had entered the official shelter, plus after the meteorite fell, the official organized another collection of materials, and now there are no materials in the city except for some reinforced concrete houses, so Lu Chen plans to start retreating to learn knowledge after searching for materials this time, and then accumulate energy to upgrade the shelter, and at the same time start trading with the official after the vegetables are ripe, You can also use the technology of nano core energy deduction as an exchange, but at present, I don't have any connections in the official, and others don't believe in the technology, so you can use some vegetables and fruits in the early stage of exchange, Lu Chen plans to wait for enough energy, open up a planting room, and then plant grapes and other low-height fruits.

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In the few days of Lu Chen's retreat, the clearance strategy in the country has achieved remarkable results, a large number of illegal armed gangs have been eliminated, ensuring the normal security of various regions, and at the same time, the official trading area has also begun to operate, there are many shelters that cannot be sustained because of the rapid changes in the environment have been exchanged for a lot of survival materials from the government, and they have been able to upgrade the shelters and strengthen their own survivability, and the construction of various production bases under the official shelter has come to an end. The planting and breeding base that is automatically managed by the Fuxi artificial intelligence of the Academy of Dragon Sciences has begun to operate normally, and will be promoted to the whole country after the first batch of livestock is slaughtered and the grain is mature.

At the same time, the losses of the Sun Country and the Star Spangled Country that fell from the meteorite before have been counted, of which two-thirds of the Sun Country is no longer able to survive, and all the underground shelters in the affected areas have been lost.

In addition, half of the Stars and Stripes were affected by the volcanic eruption in Yellowstone, and the surface was no longer suitable for human life, and the frequent locations in the area of the volcanic eruption caused a large number of shelters to be destroyed, and people had to leave the shelters and flee to other areas.

At the same time, in the Dragon Country, the capital environmental monitoring center, the alarm suddenly sounded, and the staff hurriedly checked the situation and found that there was an extremely cold air in the north moving south, which was close to the border of the Dragon Kingdom, and the staff immediately reported it, and then it didn't take long to send it to the commander-in-chief's table.

Then convene relevant departments to discuss the impact of the extremely cold air southward on our country, with the explanation of experts and scholars, we learned that according to the previous calculation, if there is no southward movement of this cold air, then the average temperature of our country will drop to about minus 20 degrees after a month after the meteorite landing, and reach about minus 50 degrees after two months, but with the southward movement of this cold air, then after 10 days, the temperature will drop directly below minus 50 degrees, if additionally with the arrival of winter, The final temperature will remain around minus 70 degrees, so the latter form is not optimistic.

Subsequently, the commander-in-chief asked all departments to convey the news, and at the same time instructed the Academy of Dragon Sciences to speed up the development of controllable nuclear fusion, and to take thermal insulation measures to ensure the safe and orderly operation of shelters.

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In the next 10 days, Lu Chen did not go out to find materials again, nor did he use the energy of the nano core, but calmed down and began to continue his own learning, through more than ten days of study, Lu Chen's brain has been re-developed, and he has basically completed the basic courses of the university, in fact, it is not considered learning, but he is consolidating his knowledge, and now Lu Chen can continue to learn more advanced knowledge on this basis, and as of 10 o'clock on June 20, the energy in the nano core has accumulated to 2880 points of energy.

After Lu Chen got up, he took a look at the energy of the nano core, and felt that he could do a lot of things, first of all, his power system can be upgraded, consuming 1000 points of energy can upgrade a small geothermal generator to a medium-sized geothermal generator set, which can achieve the goal of 2 megawatts of power set at the beginning, this power can produce 2000 kWh of electricity per hour, which is enough for a long time, and then spend 1000 points of energy to start deducing a higher-level high-energy battery based on graphene high-energy batteries. The goal is to be able to store 1,000 kWh of electricity, so that the vehicle can be directly retrofitted to achieve an all-electric drive.

Finally, wait until tomorrow to upgrade the manufacturing room to achieve a fully automated workshop, and you can directly input drawings for automatic production.

Subsequently, Lu Chen spent 1000 points of energy to create a nano worm nest and put it on top of the small geothermal generator, and then the nano core began to start, and then the power inside the shelter was switched instantly, and the backup energy began to be used, and the interior of the shelter entered a state of low power consumption, and then after the small geothermal generator set was upgraded to the central generator set, with the control of the intelligent program, the power switched to the main power operation, and the facilities of the shelter began to enter the normal operation state.

After Lu Chen watched the geothermal generator enter the normal operation state, he checked the following everywhere, and left the power distribution room when he found that there was no problem, and then Lu Chen opened the nano core, and after selecting the graphene high-energy battery in the deduction column, he entered 1000 points of energy and began to deduce, Lu Chen looked at the time, it would take about five days to complete the deduction, and then Lu Chen didn't care about it anymore and continued to retreat.

The next day, Lu Chen was woken up by a burst of alarm sounds, and found that it was the central intelligent program that was alarming, and then Lu Chen opened the intelligent program and found that the content of the alarm was related to the environment, and the information prompt detected that the external environment had changed greatly, and the outside temperature continued to decrease in a short period of time, triggering the warning value set by Lu Chen in the program, so the alarm would be generated.

Then Lu Chen logged on to the official website of the Tingcheng official shelter and found that there was a government announcement on it, the content of which was that a cold air in the north had descended on our country, and experts predicted that the temperature would drop to minus 50 degrees in ten days, and the official shelter had opened an exchange channel for insulation materials and coal.

Then Lu Chen found that the temperature in the shelter had dropped by 2 degrees, which was the value after the intelligent program control, and only in the bedroom, living room, and plantation, the temperature in other areas had dropped to more than ten degrees.

Lu Chen thought about it, came to the power distribution room, dismantled the biogas generator, then re-laid the pipes, spent 500 points of energy to make a small boiler, used biogas to heat the boiler to ensure that the temperature inside the shelter was normal, and then spent 100 points of energy to strengthen the warmth function of the protective clothing, and finally looked at the remaining 500 points of energy, Lu Chen first spent 200 points of energy and building materials to expand the original planting room to a size of 400 square meters, and then planted cabbage and lettuce again on the extra land, and tomatoes, then, Lu Chen used the remaining 300 points of energy and building materials to open a new planting room next to the planting room, with an area of 300 square meters, and then poured water into the land inside, and then Lu Chen took the rice seeds and began to raise seedlings, preparing to use this planting room as a planting base for rations.

After doing all this, Lu Chen continued his retreat journey.

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Five days later, with the completion of the research of high-energy batteries, and the accumulation of a lot of energy, Lu Chen began to transform the outfit, because the vegetables will be ripe in a few days, and now it is so cold outside, it is estimated that his car can no longer be sent, so it is necessary to transform the vehicle and protective clothing before the vegetables are ripe.

Then Lu Chen looked at the newly researched high-energy battery

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Graphene lithium-ion batteries

Manufacturing requirement: 100 points of energy / 50 points of energy (graphene batteries are provided) / kg

Energy density: 200WH/g

Description: The high-energy battery developed by graphene battery technology has an energy density of 200wh/g, and its unique graphene technology brings a large amount of power to release and charge a large amount of electrical energy in a short time, which can provide a lot of power for electrical equipment (or direct overload).

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Lu Chen looked at this battery and gasped directly, this thousand points of energy is too worthwhile, it is worthy of a penny for a penny, and it is directly increased to the point that every kilogram of battery contains 200 degrees of electrical energy, which means that if you make a ten-kilogram battery, then there will be 2000 degrees of electrical energy in it, which is ten times higher than the previous one.

Then, Lu Chen saw that there were 1200 points of energy in the nano core, and then took out 200 points of energy to transform it based on two graphene batteries, the energy of the battery reached 800 degrees, and at the same time, he took out 500 points of energy again to upgrade the external high-strength fiber material of the protective suit to a high-strength alloy material, and at the same time, the protective suit is no longer similar to the bloated form of the spacesuit, but has become a style similar to the accelerated armor in the movie, and the internal high-strength fiber material has become the inner lining, strengthening the shock absorption device in the armor, At the same time, the battery was integrated into the interior of the armor, also in the back of the armor, but now it was protected by the armor.

In the end, with the remaining 500 points of energy, Lu Chen planned to save up for a few more days, and when the energy was enough, he would start to transform his car, from using fuel to using electricity.

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A few days later, on the last day of June, Lu Chen woke up in the morning and saw that the panel outside the plantation showed that the first batch of vegetables were ripe, and then Lu Chen took the sack and began to enter the plantation to harvest, and finally left 50kg of cabbage and 10kg of lettuce for himself to eat, and the rest were harvested and packed into sacks ready to be traded at the official shelter.

When Lu Chen packed the dishes, he found that the energy of the nano core had been saved to 1500 points, and he could already transform the vehicle, and then Lu Chen came to the garage and used 1000 points of energy to create a transformed nano worm nest.

In the afternoon, after Lu Chen finished eating, he came to the garage and found that the car had been transformed, the transformed vehicle was similar to the Ford Raptor model, but it was more domineering than the Raptor, the rear compartment became fully enclosed, the front became a double-row four-seater, the ground became a lot higher, and the tire strength felt higher than the average tire, Lu Chen estimated that it was about the same as the explosion-proof tire, the whole car skeleton was also strengthened, the load capacity reached 5 tons, and the power of the car was increased to about 500 horses, looking at the big monster in front of him, Lu Chen nodded with satisfaction, now it's just a battery,

Wait until ten o'clock in the evening, Lu Chen has 600 points of energy in his hand, directly exhaust the energy and start to integrate the battery, and then Lu Chen installed the battery in the car and began to charge, the electric energy of 1400 degrees is enough to drive this beast to run more than 600 kilometers with full load, and the internal warmth and heating have been done to the extreme, which can ensure that the temperature in the car is not lower than 15 degrees in the environment of minus 70 degrees, plus the internal oxygen supply device, it is equivalent to a small carrier car in the movie, but the space may not be so large.

After Lu Chen saw that everything was ready, he loaded all the vegetables into the back compartment, closed the door and went back to sleep, to recuperate his spirits, and to trade tomorrow.