Chapter 2165 Full preparation

Dongfang Yuliang and his army escaped from the city wall in a panic. Although the losses were heavy, hundreds of thousands of people fell into the city wall in the short few minutes. There were countless beasts falling down. But this level of loss was worth it, because there were no points to defend in the city wall. Next, they only needed to find the entrance to the underground space, or dig an entrance to them, and then rushed in. They completely broke through the underground base.

In fact, they have tried before. Digging tunnels from outside the entrance and digging directly in the direction of the underground base. But the enemy seems to have some way to explore underground excavations. Before digging the enemy's underground base, the tunnels they dug will be connected with the tunnels dug by the enemy.

When the excavation team suddenly dug through the soil in front. They were surprised to think that when they came to the underground base, they actually broke into the enemy's ambush. Usually, they just dug the tunnel and got a super cannon. The terrain in the tunnel was narrow and there was no place to hide. The impact of the explosion directly sprayed the excavated person out of the tunnel like a shell. Of course, when it was sprayed out, they must have had broken limbs and arms.

After trying a few times, I found that the opponent's reconnaissance move was very powerful. No matter which angle it was excavated, it would be discovered by the enemy. Then I dug the tunnel in advance to counterattack. After digging for a long time, not only did I not be able to dig out the attacking passage, but I also lost a lot of people. Unfortunately, they could only give up and choose to go in from the main gate.

There must be a large-scale material transportation between the underground base and the ground. Even considering the defense, there must be several main gates with huge traffic. These passages can accommodate a large number of people and materials, which means entering from here, and the army will not be unable to form a formation like in a small tunnel.

When he investigated the situation in the city again that night, he had already reported it afterwards. There was almost no one in the city. He even climbed over the city wall and searched inside and found that even the wreckage of the city wall was no longer defending. This is normal. There were few people on the underground base. I had just fought a big battle before, but the losses were actually quite large.

After the city wall was broken, there was no such barrier as a support. The war loss ratio of people in the underground base was actually greatly increased. Even in the battle not long ago, they suffered heavy losses of hundreds of thousands of people in a few minutes. But if we really calculate the war loss ratio of the entire battle, the war loss ratio after the city was broken was a little better than before.

Before the city wall was broken, their losses were not so heavy, but the same enemy's losses were even more slim. If they continued to rely on the broken city wall to defend, the war loss ratio would be further shorter, and then there would be no defense for a few days. They would not have enough manpower.

Rather than this, it is better to retreat underground to preserve vitality. In this way, the underground base can rely on the complex environment to resist for a long time. If the blizzard in the outside world really falls completely, the attack will not be able to continue. In other words, as long as they can resist until winter, they will at least survive. General Winter will equally punish everyone who is arrogant and has not taken good measures to keep the cold.

At this moment, a large number of wounded people in the underground base are being treated. At the same time, except for a few residential and industrial areas, most areas have engineers undergoing transformation. Corresponding defense bases are established in those areas to defend against every tunnel and every key corridor.

The walls of these tunnels are made of high-strength reinforced concrete and are quite thick.

The purpose is to prevent the enemy from digging holes between these tunnels and disrupting their original arrangements.

With this layer of reinforced concrete, it took at least several hours for the enemy to dig holes to break the thick isolation, and this period was enough for them to mobilize manpower and siege the engineers in the tunnel.

At the same time, a large number of non-combatants gathered at the bottom of the underground base. The upper and lower levels of the upper and lower levels of the upper and lower areas will not be divided according to their status. It is just that the functions of the responsibility are different. A large number of non-combatants gathered at the bottom of the base are engaged in geothermal energy collection.

Without the sun in the sky, the plants and trees in nature will not grow naturally. If this is the case, they may be able to stick here for a winter. But if the enemy continues to be besieged next year, they cannot leave the underground base to collect food and collect all kinds of other materials that exist in the sun. Sooner or later, they will be trapped to death. Just like the cities surrounded in ancient times, even if they have strong defenses, the enemy will not be able to defeat them, and they will eventually be unable to survive because of water and food.

So at this moment, they must develop a model that absorbs energy from natural media and converts organic matter in addition to planting. This is not just for the source of food, but more importantly, in extreme cases, they need to purify the air in this way.

This time, the enemy has a strong learning ability and can summarize various experiences and lessons from the war. This means that as these guys fight, they will find that although the space of the underground base is vast, it is located underground and does not ventilate with the outside world. The air will soon become turbid. To solve this problem, there must be ventilation ducts on the ground.

No matter how hidden these pipes are arranged, they will be found by the enemy sooner or later. As long as these ventilation pipes are blocked, a good air circulation system is lost in the underground base. The oxygen consumed by the exhaust gas produced by people's breathing is enough to make the people in the underground base self-defeating.

It is true that they carry a large amount of medicines that can purify the air and liquid gases. But these can only solve the temporary difficulties. If you want to fight underground for a long time, you must form a self-circulation. Either you obtain enough energy underground, simulate sunlight for lighting, and carry out large-scale planting underground. Or you can find a way to absorb energy from nature other than photosynthesis to purify the air.

For them who started with biotechnology, the latter is relatively easier. Although most of the combat Trojans exploded on the battlefield, many genetic seeds were left behind, some of which were specialized in energy absorption.

As long as there is a temperature difference, they can use this part of the temperature difference to convert it into the energy they need, thus carrying out the process of absorbing carbon dioxide and emitting oxygen similar to photosynthesis.

In fact, there are also some ancient fungi on the earth that can use the heat energy of undersea volcanoes to synthesize the organic matter they need. However, their living environment is relatively extreme and their efficiency is also very low. Unless the people on earth have huge demands for this, they don’t know when they want to cultivate and transform, and they may never be able to use it.

At this moment, a large number of workers were busy carrying a small pipe at the bottom of the underground base. Some were responsible for digging holes and inserting the pipes deep into the ground, while others were responsible for welding these pipes, or directing the construction of geothermal plants.

Water will be directly injected into the ground. Then, after being heated by geothermal energy to almost boiling, it will be transported up because the pipeline forms a communicator-like structure. In addition, cold water is on one side and hot water is on the other. This process consumes almost no energy, and even the cold water will automatically pour downwards, and the height difference between the hot and cold water will further aggravate the transportation process, thereby making more effective use of geothermal energy.

Hot water will be transported to the cultivation room, and the bottom of the special bacteria will be tightly wrapped by a layer of insulation board, so that the upper half of these bacteria will be exposed to the air at room temperature, while the lower half is in high temperatures and near boiling water. The huge temperature difference allows them to efficiently use the high temperature of water to convert it into the energy needed for their own growth.

The cultivation room does not need to be very complicated. This means that the cultivation scale can be very large. There is no need for sunlight, which means that the cultivation room can be stacked layer by layer, and the demand for space is not very high. In this way, it is theoretically enough to bear the consumption of everyone in the entire underground base.

Compared with air, the problem of water sources is slightly easier to solve. But in fact, it is not so easy to solve. Some of the precipitation on the surface will penetrate into the ground. It accumulates underground to form underground rivers without any exposed ground areas. Some of the underground bases connect these underground rivers, and water sources can be obtained continuously from there, but these water sources may be destroyed by the enemy in the end. Therefore, the water sources in the city also need to be recycled. There are special bacterial species areas responsible for absorbing and purifying organic matter in the water sources and absorbing harmful substances, thereby realizing the recycling of water sources.

For this reason, a large amount of sewage will even directly remove harmful substances through distillation, which wastes energy. In order to reduce the energy waste, after the internal combustion engine and electric motor has been replaced on a large scale, several giant steam turbines are still retained underground, using geothermal energy to distillate sewage and maintain the energy consumption of the entire city.

Such engineering is a miracle in this era. If there is no external force to destroy it, the system can operate for thousands of years. Even if it does not reach the ground during this period, as long as someone maintains this system, it can theoretically continue to operate.

These were not expected by the coalition forces on the ground. When they wanted to dig holes in this way, even if all the staff hid in it, they would not hide for long. Even if the food was enough, water source, air and other problems were enough to cause the closed system to collapse.

Dongfang Yuliang is also a ruthless man. He did not send people to attack immediately, but found all the entrances. A large number of explosives were buried at the entrance gate. No matter how strong these doors are, they cannot rely solely on the strength of the door itself to defend against the enemy. There is always a way to break these doors.

As the explosion sounded, there was a surging flood flowing. The dams that had previously blown upstream had been changed due to artificial transformation. The river flowed directly through the area where the town was located. At this moment, the landform of the city was changed. The river flowed directly in, aimed at the entrance and poured in.

Faced with such ground rats that hide themselves underground, they should flood them like using water to flood an ant nest until they drown all the people inside.

There have been holes that have been made underground on the grassland before. In this world with extraordinary power, soil is a substance that can be controlled. It is much less difficult to make holes underground than on the earth. At that time, water can often have miraculous effects.

However, this time they miscalculated. The river water kept pouring into the dungeon gate that was blown out. The surging amount of water was enough to trigger a flood. If it were other enemies who dug holes, they might have been forced to escape from the ground at this time.

But at this time, the personnel responsible for water resources management in the underground base all showed joy.

"Reservoir No. 1 is almost full. It is expected that the injection port of Reservoir No. 1 will be cut off in 15 minutes. Reservoir No. 2 will prepare to receive water resources. Remember to remind the water quality inspection department to randomly check the water samples every 5 minutes. After the random inspection is completed, it is only allowed to inject external water sources into the reservoir after confirming that there is no abnormality."

In the noisy sound of water flowing, radio waves convey people's shouts and joy in obtaining a large amount of water resources.

The underground base was expanded before, and the city was besieged again. The original reserved water resources were in short supply. At least the eight underground reservoirs were not filled, and now the enemy suddenly began to flood the flood, so they could completely refille the deficit reservoirs.

As for all the reservoirs, there is no need to worry. The excess water can be directly injected into the underground river. This amount of water will take at least a few years to fill the water storage space of the underground base and reach a level that is enough to affect the normal life of the underground base. By then, the daylily will be cold.

The coalition forces surrounded the entrance of the underground base and waited for the escaped enemy. This waited for a whole day. Someone calculated the amount of water injected into it during this period. Logically speaking, it was enough to fill a huge space. At this moment, the people inside were still calm and had no intention of escaping.

Unfortunately, they had to give up changing the river for the time being and empty the entrance.

There is at least one advantage of continuous water injection, that is, the gate is damaged by continuous washing, and the turbulent water flow area makes the enemy unable to defend. At least they have successfully seized several city gates leading to the underground base, so that they will not pay a lot of battle damage at the location of the city gate.

There are not many masters in the vanguard troops. They are more likely to investigate the underground environment and report on the situation. As soon as these cannon fodders entered the gate, they encountered a scene that made them feel scared.

【To be continued】

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