Biotechnology does have its advantages. In essence, the use of organisms for industrial production is equivalent to the use of Neumann machines. These devices can replicate their own characteristics, so that after a product is finalized, it can be mass produced like bamboo shoots after a spring rain.


    They don''t need any chemical energy, they just need to provide a lot of organic matter. Their physical and mental needs can be realized by planting grass. Cultivating corresponding plants that can absorb sunlight can quickly convert solar energy into the energy they need.


    Even though Silva has been heavily surrounded, the Empire still dare not close the encirclement too tightly. Within an area of nearly 100 kilometers in diameter, there are more than 7000 square kilometers of land, at least half of which. Infected people do not have the ability to control effectively. Plants that can absorb solar energy efficiently can provide a lot of energy underground.


    Even if these energy sources are still not enough, a large number of high-strength organic materials also alleviate the threat of insufficient metal minerals for infected people.


    Silva has started an unprecedented high-speed development and is ready to try the ignition of nuclear reactors. This is the once important industrial town of Tiandou empire. There are abandoned nuclear reaction facilities and nuclear raw materials on the surface.


    It may not be enough to rub nuclear bombs, but it can be used to heat the reactor after refining. There has been no attempt in this regard before because there is no suitable material on hand.


    The scarcity of metal minerals makes it difficult for them to synthesize high-strength alloys by themselves. In this case, if they continue to rely on metal materials, it is almost impossible for them to enhance the strength of materials to a level sufficient to carry nuclear reactions.


    It was not until they changed a technology tree and began to try organic materials that they gradually found a way to make materials with sufficient strength. It won''t be long. They can successfully ignite.


    And there is a lot of nuclear fuel left on the surface. It can provide them with energy consumption for hundreds of years. Plus absorbing surface light energy. Their energy will no longer be scarce, and the development speed of science and technology in the future will get an incredible degree.


    At present, this incredible underground city. It has become deeper and bigger.


    A large number of underground buildings are made of biological materials, which can be seen on the construction site. Architecture is like. Grow quickly. But if you think the creeping building walls are extremely soft. That would be a big mistake.


    Cells lose their activity rapidly after growth and finalization. When the cell membrane breaks, the organic matter contained inside reacts quickly with the cell wall, forming the same tight support as the crystal lattice between each cell. The seemingly soft building materials will harden rapidly, and the strength is even worse than that of shoulder concrete.


    Looking at the light yellow grass leaves after the carts were dried. It is sent into the filler mouth, and then the building grows rapidly with the continuous swallowing of organic matter, which is really an indescribable feeling. Especially after the whole building is completed. Attached to the building surface is similar to blood vessels. Things used to transport mechanisms will collectively necrosis and fall off, just like a huge creature, muscle necrosis and ulceration. It seems that San is very lost. Seeing such a picture for the first time may even leave a psychological shadow.


    However, the adaptability of intelligent creatures is still very strong. After the initial discomfort, infected people gradually adapt to their own unique painting style, a trace of kesulu style industrial system, and even occasionally try to make biochemical eye beads kebabs, an authentic kesulu dish in their own home.


    The excavation of underground space was originally a very troublesome thing. Infected people lack high-strength metal and are difficult to make their own shield machine.


    In the past, it was through the powerful power of individuals and the assistance of skill methods. Forced excavation, and later met the imperial encirclement and suppression forces. The blades of several shield machines were replaced. But although it is strong, it is a consumable after all. The process of excavation will inevitably wear and tear. The blade that led to the seizure. They were all broken after being used for a few times after assembly.


    This once limited Silva''s expansion. After all, personal strength is limited. Even if he practices the skill of earth attribute, it is underground at most. Drill out the appearance of a research institute. They want to build it. But it is a city that may accommodate hundreds of thousands of people in the future. This is by no means possible for a few people alone, nor can there be so many people. This is a special skill to cultivate the attribute of mapping earth, which is used to open up underground space.


    All aspects of a city need manpower to maintain. There are only a few thousand people responsible for the excavation project at most. If they excavate purely by manpower, they will know when they can expand the scale of the city to one million people that day.


    OK, later, with the gradual development of biochemical technology, the scientific research department cultivated giant digging worms.


    They have sharp mouthparts that can easily age hard rock formations. And swallow the gravel and soil and compress it by relying on the powerful muscles in the body. It also produces high-density columns that can be used as building materials. People in the engineering team jokingly call these hard building materials excrement alloy, which means excrement as hard as alloy. In a sense, it is quite appropriate.


    These high-density building materials will be transported away. As a support column between the underground floors, a worm has a total of 19 esophagus, one large and 18 small, and a mouthpiece cuts and devours rocks. Will be peristaltic by the mouth. Distinguish between different hardness, the harder will be compressed into the small esophagus with compression and peristalsis. They are spirally squeezed into the thicker esophagus.


    These harder rocks are compressed. It will greatly enhance the strength of stone columns like reinforced concrete, so that these excrement alloys have very high strength. It can support the huge pressure between huge soil layers.


    At present, the biggest goal of these worms is to dig into the underground asthenosphere. Use the temperature difference between magma and surface there to establish geothermal power generation facilities. Provide a large amount of geothermal energy for the city.


    This will be the most important source of energy for the city before the nuclear reactor is ignited. Even after the ignition, it will still become an important energy supplement. After all, even if the Empire has the ability, it is impossible to dig into the asthenosphere and circle them all to prevent the magma from flowing in their direction. This is the safest and reliable energy source Silva can find at present.


    But they did not expect that this excavation would bring them unexpected joy. The former tulip people found prosperous atmospheric creatures in the sky, and there were also prosperous biological groups in the underground where they had not set foot.


    [to be continued]


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