Ten thousand I am across the heavens

Chapter 2165 Completely Prepared
Dongfang Yuliang and his army fled out of the city wall in a panic. Although the losses were heavy, hundreds of thousands of people fell inside the city wall in just a few minutes. The number of fallen beasts was countless. But this level of loss was worth it, because there was no point in the city wall that could be defended. They only needed to find the entrance to the underground space, or dig an entrance themselves, and then fight hard to break into this underground base.

In fact, they had tried it before. They dug a tunnel from outside the entrance and directly dug in the direction of the underground base. But the enemy seemed to have some way of detecting the underground excavation, and before digging to the enemy's underground base, the tunnel they dug would be connected with the tunnel dug by the enemy.

When the excavation team suddenly dug through the soil in front of them, they were surprised to think that they had arrived at the underground base, but in fact they had directly entered the enemy's ambush. Usually, they were hit by a super cannon just after digging through the tunnel. The terrain in the tunnel was narrow and there was no place to hide. The impact of the explosion directly ejected the diggers from the tunnel like a cannonball, and of course they must have been ejected with broken limbs.

After trying several times, they found that the enemy's reconnaissance trick was very powerful. No matter which angle they dug, they would be discovered by the enemy, and then they would dig a tunnel in advance to counterattack. After digging for a long time, they not only failed to dig out an attack channel, but also lost a lot of people. They had no choice but to give up and choose to break in through the main gate.

There must be a large amount of material transportation between the underground base and the ground. Even if defense is taken into consideration, there must be several main entrances with huge traffic. These passages can accommodate a large number of people and materials, which means that the army will not be unable to form a formation when entering from here like in a small tunnel.

When he reconnoitred the situation in the city that night, he reported afterwards that there was almost no one in the city. He even climbed over the city wall to explore the interior and found that even on the remains of the city wall, there was no one defending. This was normal, as there were few people in the underground base. They had just fought a big battle, and the losses were actually not small.

After the city wall was breached, without this barrier as a support, the casualty ratio of the people in the underground base actually increased greatly. 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 casualty ratio of the entire battle, the casualty ratio after the city was breached is actually better than before.

Before the wall was breached, their losses were not so severe, but the losses of the same enemy were even more negligible. If they continued to rely on the broken wall for defense, the casualties would be further reduced, and they would not be able to defend for a few days. They would not have enough manpower.

It would be better to retreat underground to preserve the living force. In this way, the underground base can still rely on the complex environment to resist for a long time. If the blizzard outside really comes, the attack will not be able to continue. In other words, as long as they can resist until winter, they can at least survive. General Winter will punish everyone who is arrogant and does not take good measures to keep warm.

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

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

This is to prevent the enemy from digging holes between these tunnels and disrupting their original layout.

With this layer of reinforced concrete, it would take the enemy at least several hours to dig a hole to break through this thick layer of isolation, and this period of time was enough for them to mobilize manpower and besiege the engineering personnel in the tunnel.

At the same time, a large number of non-combatants gathered at the bottom of the underground base. There was no upper or lower city divided by status. The upper and lower levels were just responsible for different functions. A large number of non-combatants gathered at the bottom level to work on geothermal energy collection.

Without the sun in the sky to provide a stable source of energy, the plants in nature would not grow naturally. If so, they might be able to hold out here for the winter. But if the enemy continues to besiege them next year and they cannot leave the underground base to collect food and other supplies that only exist under the sun, they will be trapped to death sooner or later. Just like those cities that were besieged in ancient times, even if the defenses were strong, the enemy could not take them down, and eventually they would be unable to survive due to lack of water and food.

So at this moment they must develop another mode of absorbing energy from natural media and converting it into organic matter besides planting. This is not only for the source of food, but more importantly, they need to purify the air in this way in extreme cases.

The enemy this time has a strong learning ability and can draw lessons from the war. This means that as the guys fight, they will find that although the underground base has a large space, it is located underground and is not ventilated to the outside world. The air will quickly become turbid, and to solve this problem, there must be ventilation ducts on the ground.

No matter how concealed these pipes are, they will be discovered by the enemy sooner or later. As long as these ventilation pipes are blocked, the underground base will lose its good air circulation system. The exhaust gas produced by people's breathing and the oxygen consumed will be enough to make the people in the underground base collapse.

It is true that they carried a large amount of medicine and liquid gas that could purify the air. But these could only solve the problem temporarily. If they wanted to fight underground for a long time, they had to form a self-circulation. Either they could obtain enough energy underground, simulate sunlight for lighting, and carry out large-scale planting underground. Or they could find a way to absorb energy from nature to purify the air other than photosynthesis.

For them, who started out in biotechnology, the latter was relatively easier. Although most of those combat Trojans exploded on the battlefield, they still left behind many gene seeds, some of which were specialized in energy absorption.

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

In fact, there are some ancient fungi on Earth that can use the heat energy of submarine volcanoes to synthesize the organic matter they need. However, their living environment is relatively extreme. And their efficiency is also very low. Unless the earthlings have a huge demand for this, it is unknown how long it will take to cultivate and transform them, and perhaps they will never be used.

At the bottom of the underground base, a large number of workers were busy moving a small pipe. Some were responsible for drilling holes and inserting the pipe deep underground, while others were responsible for welding the pipes. Or they were directing the construction of the geothermal plant.

Water will be directly injected into the ground. After being heated to almost boiling point by geothermal energy, it will be transported up again because the pipe forms a connecting vessel-like structure. In addition, there is cold water on one side and hot water on the other. This process consumes almost no energy, and even the cold water side will automatically pour down. The height difference between the cold and hot water sides will further intensify the transportation process. Thus, geothermal energy will be used more effectively. Hot water will be transported to the cultivation room, and the bottom of the special fungi will be tightly wrapped by a layer of insulation board, so that the upper part of these fungi is exposed to the air at normal temperature, while the lower part is in the high temperature and nearly 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 growth.

The cultivation room does not need to be complicated. This means that the scale of cultivation can be large. No sunlight is needed, which means that the cultivation rooms can be stacked layer by layer, and the space requirement is not very high. In this way, in theory, it is enough to bear the consumption of all the people in the entire underground base.

Compared to air, the problem of water is a little easier to solve. But it is not that easy to solve. Some of the precipitation on the surface will penetrate into the ground. It accumulates underground to form underground rivers that are not exposed to the ground. Part of the underground base is connected to these underground rivers, from which water can be obtained in an endless supply, but these water sources may be destroyed by the enemy. Therefore, the water sources in the city also need to be recycled. There is a special bacterial strain area that is responsible for absorbing and purifying organic matter in the water source and absorbing harmful substances in it, so as to realize the recycling of water sources.

For this reason, a large amount of sewage will even be directly distilled to remove harmful substances, which is a waste of energy. In order to reduce the energy waste, after a large-scale replacement of internal combustion engines and electric motors, several giant steam turbines are still retained underground to use geothermal energy to distill sewage and maintain the energy consumption of the entire city.

This kind of engineering is a miracle in this era. If there is no external force to destroy it, this system can operate for tens of thousands of years. During this period, even if there is no access to the ground, as long as someone maintains this system, it can theoretically continue to operate.

These were things the coalition forces on the ground had not thought of. They thought that even if all the members hid in the cave, they would not be able to hide for long. Even if there was enough food, water, air and other problems, it would be enough to cause this closed system to collapse.

Dongfang Yuliang was also a ruthless person. He did not send people to attack immediately, but found all the entrances. He buried a large number of explosives at the entrance gates. No matter how strong these gates were, they could not rely on the strength of the gates alone to defend against the enemy. There was always a way to break these gates open.

As the explosion sounded, a raging flood flowed in. The river course that had previously destroyed the dam upstream had been changed due to human modification. The river flowed directly through the area where the town was located. At this moment, the topography of the urban area was changed. The river flowed directly in and poured into the entrance.

When facing this kind of ground rat that hides itself underground, you should flood it like you would flood an ant nest, until all the people inside are drowned.

It's not like there have been people digging holes underground on the grassland before. In this world with extraordinary power, soil is a substance that can be controlled. Digging holes underground is much easier than on Earth. At that time, watering often worked wonders.

However, they miscalculated this time. The river water continued to pour into the underground city gate that was blown open. The surging water was enough to cause a flood. If it were other enemies who dug holes, they would probably have been forced to escape from underground by now.

But at this time, the people responsible for water resources management in the underground base all looked happy.

"Reservoir No. 1 is almost full. It is expected that the injection port of Reservoir No. 15 will be cut off in 1 minutes. Reservoir No. 2 is ready to receive water resources. Remember to remind the water quality testing department to take random water samples every 5 minutes. After the sampling is completed and no abnormalities are confirmed, external water sources are allowed to be injected into the reservoir."

Amid the noisy sound of rushing water, radio waves convey people's cries and their joy at having a large amount of water resources.

Previously, the underground base was expanded and the city was under siege, so the original water resources were somewhat short. At least the eight underground reservoirs were not full, and now the enemy suddenly started flooding, so they could completely refill the depleted reservoirs.

As for when all the reservoirs are filled, there is no need to worry. The excess water can be directly injected into the underground river. It will take at least a few years to fill the water storage space of the underground base with this amount of water and reach a level that can affect the normal life of the underground base. By then, the opportunity will be gone.

The coalition forces circled the entrance of the underground base, waiting for the enemy to escape. This wait lasted a whole day. Someone calculated the amount of water that had been injected during this period. Logically, it was enough to fill a large space. At this moment, the people inside were still calm and had no intention of escaping.

They had no choice but to temporarily give up changing the river course and leave the entrance empty.

There was at least one benefit of continuous water injection, which was that the gate was damaged by continuous scouring, and the area with fast-flowing water made it impossible for the enemy to defend. At least they successfully captured several gates leading to the underground base, so they did not suffer a lot of losses at the gate location.

There weren't many experts in the vanguard. Most of them were investigating the underground environment and reporting back. As soon as these cannon fodders entered the gate, they encountered a scene that frightened them.

[To be continued]

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