4. Tissue regeneration: In order to transport insect swarms on any battlefield or ground, tunnel worms can be infinitely elongated through on-demand tissue regeneration function. ∈◆, because they are connected to the insect channel network, the insect channel network can provide the necessary nutrients for tunnel worms, allowing tunnel worms to expand and replicate their cells under a simple command. The excess tissue will be assimilated and absorbed again after the tunnel worm returns to the insect channel network.

5. Bacteria blanket glands: Although tunnel worms produce a large amount of gravel rubble when digging, they will dispose of these wastes in a very effective way. First, the crushed rocks and soil will be covered by a layer of corrosive bacterial blanket secreted from the glands of the pit bug's mouth. When these rocks and soil are liquefied, these substances will be transferred through a pair of glands to a special interlayer below their epidermis, allowing tunnel worms to use their own epidermis and skeletons to support the tunnel.

If Behemoth and Leviathan are the spacecraft of the swarm, then tunnel insects are the submersible passages of the swarm, which can create underground passages in planetary environments to transport Zerg troops.

Just imagine, if the enemy commander would feel when he knew about the attack of the ground forces while cooperating with the attack of the ground forces, and the rear wing was attacked by the tunnel insects?

Tang Fang felt that if he had been, he would definitely not be happy.

The cost of the insect channel network is 150 crystals and 200 gas, which is the same as the spine needle reptile and does not occupy a population.

Next is the Zerg's three bases and the main nest.

After upgrading the Zerg base from the insect hole to the main nest, some upgrade items can be unlocked with a new Zerg flying unit Flying Snake.

The upgrade project includes the puppy's "evolutionary adrenal glands". It is not only the so-called "mad dog" but also the third-level offensive and defense projects of the Zerg unit related to the evolution cavity and spire have also been unlocked.

As for the flying snake, the flying snake inherited the support role of the Zerg that was previously played by the scorpion. The flying snake gathered several vicious biological and chemical weapons to weaken the enemy's combat power and provide battlefield advantages for the alien insects. This flying unit contains thick microbial mucus in the abdomen. When the ranged unit approaches, sprays vicious mixed liquid in the air, causing the enemy to lose its attack effect within the range of poisonous fog. The enemy who is trying to escape to the high ground will soon be pulled back by the flying snake's powerful nose tube, allowing the alien insect to gain an advantage against any terrain. When injured, the flying snake can absorb biochemical electricity and nutrients from other alien insect buildings, quickly treat the damage and return to the battlefield to continue fighting.

The main structure of the flying snake is composed of 5 parts.

1. Elastic tail: The function of the flying snake's tail is basically similar to that of its prototype polluter (scorpion). However, its further evolution allows the flying snake to maintain balance and maintain direction while flying, and even has the function of steering. However, the most special structure of the flying snake's tail is the ingrown crystal spikes on the surface of the tail tip. These "crystals" can release powerful pulses, allowing the flying snake to accurately locate the target.

2. Jagged forelimbs: Although the appearance is scary, the alien insects choose to remove the aggressive function of the forelimbs, so that they only have a simple auxiliary grasping function. The prominent spikes are composed of porous bone structures and are directly connected to the lymphatic system of the flying snake. They allow it to pierce and fix the prey without causing fatal damage. When sneaking, the spikes will release pheromones, allowing the poor prey to mistake the flying snake for a harmless and non-threatening creature.

3. Lesion blood: The polluter (scorpion) originates from a worsening carcinogenic pathogen, which is essentially a residual gene fragment of other heterozygotes. This primitive supporting weapon will harm both the enemy and the heterozygotes themselves, and degenerate into useless organs after the battle of the mother. Now, since the alien insects need a new branch of specialized branches, they seem to use the gene bank of some unknown species to re-examine and improve the polluter as a flying snake, retaining important functions, and eliminating unnecessary lethality.

4. A nose suitable for grasping: This extended organ is the digestive system of the flying snake. It can be extended to the entire body length of the flying snake. Just like a frog uses its tongue to catch prey, the flying snake will forcefully pull back the elastic intestinal tube, grab the target and drag it back into the body.

5. Tissue absorption: Flying snakes can break the ion chains in the hardened tissue of the insect nest to create a nutrient-rich liquid. This liquid can activate a large number of microorganisms in the flying snake's blood to generate and replenish the bioelectric energy of the flying snake.

The positioning of the flying snake is an auxiliary unit. It has almost no attack ability, but its three skills are very powerful in the battle mode and do not require additional upgrades, namely "devouring", "kidnapping", and "eye-blocking poison cloud".

"Swallowing" means to exert the characteristics of tissue absorption, and increase energy and health by absorbing ion chains in Zerg building hardened tissue.

"Kidnapping" is the magical skill of dragging the target to the flying snake's position. The battle mode.

"Eye-blocking Cloud" turns the attack range of ground units and buildings under it into melee, and can be regarded as the nemesis of ranged units.

In terms of cost, it requires 400 crystals and 800 gas, occupying 3 people, which is 4 times that of the game. It must be more than 40 meters long.

Tang Fang felt that if the flying snake cooperated with the queen to deal with the army, it would be a bit difficult to deal with the threat in the air. "Kidnapping" is a skill that is very effective in battle, but in reality it is simply useless, because the smallest frigate in the warship system of human society is more than 100 meters. At most, the "kidnapping" of the flying snake will deal with small-sized units such as aerospace fighter, various types of drones, and shuttles, depending on whether they give it face.

Although the appearance of the flying snake cannot bring about an upgrade of the combat effectiveness of the air force, the main nest appeared very timely. The war between Star Covenant, Mengya and Sulu might start one day. The Black 7 "Anubis" legion was also eyeing it. Corruptors and Feilong, as the main combat units of the Air Force under his command, urgently need to improve their combat effectiveness again.

Thinking of this, he first pressed the button for the evolution of the insect hole into the main nest, and then spent 2,000 crystals, and 2,000 gas to add the puppy's "Evolutionary Adrenaline" to the upgrade list, and finally moved to the menu bar of the spire. Looking at the unlocked "Evolutionary Flying Biological Attack Level 3", "Evolutionary Flying Biological Carapace Level 3" came back to his senses and sighed bitterly.

The two upgrade projects require a total of 11w crystals and 11w gas, while the total number of resources now is only 1069345, 168014.

He remembered that when Tang Lin cleaned the Mind Bat-class destroyer, he collected a total of 3 tons of zero-price. The zero-price reserves of this level are quite high for a destroyer. But for him, it is only 3,000 gas, and even if the "Ming Bat" in Behemoth's belly is only 6,000 at most.

The resource volume of the "tree demon" reaches a terrifying 20,000 crystals of 12,000 gas. He believes that there must be more than this "tree demon" in the "Akron" strata. However, after experiencing the fierce battle just now, he did not want to be enemies with other "tree demons" in such an underground environment. Even if they have extremely high resource value, there are still zero mineral veins distributed in the strata.

Among other ways to obtain zero quotas, the most convenient and most productive one is to quarrel the government. You must know that he just got nearly 10,000 tons of zero quotas from Adam Oliver and various military-industrial enterprises. It is a bit inappropriate to interfere so quickly. At least he has to wait for Star Covenant, Mengya, and Sulu to fight, and then he will make another profit.

Since we can't argue, there is another way to buy it! We use the huge 800 billion yuan he has bought it, but the market is not very good if we buy it now. Because all countries are actively reserveing ​​zero-price resources to expand their arms, the zero-price price has increased significantly recently.

This is not good, nor is it good, he was a little upset for a moment.

otherwise……

"Tang Fang, what are you doing? If you don't come out of the river, you will fill the hole."

Just as the light flashed in his mind and thought of a good idea, Zhou Ai's voice sounded in his ears, and he quickly looked back. He saw that the flowing water that reflected the rippling waves under the light had already risen to Thor's chest, and in a moment it would flood the cockpit.

He quickly took the system space of the suffering Thor to SV for repair. Then he summoned a flying dragon, hugged its body and drilled out of the "water curtain cave" and returned to the fire platform.

Zhou Ai had already gotten off the Banshee fighter plane. Roy sat on the ground, his face pale and disappeared. He was holding a compressed biscuit in his hand, filling it with force as if he had never had enough food in his eight lifetimes. His cheeks were bulging and swollen, like a pair of meat balls.

"Dead?"

Tang Fang nodded: "Die."

Although I had guessed, the girl still breathed a sigh of relief, looked at the river extending into the darkness and said, "Go back, I don't want to stay here for a moment."

Several rocks fell between Behemoth and the surrounding stone walls. When the water fell into the river, a splash of water splashed, and the air was filled with a strange smell. The moisture soaked the clothes and felt uncomfortable sticking to the body.

Tang Fang agreed, put away the ground units of the people and the Gods on the fire platform, released a detector, and investigated the current structure of the large hollow along the gap between Behemoth and the surrounding stone walls, looking for the tunnels that they passed when they came.

About 5 minutes later, a message came out as bad news.

What he was most worried about happened. The tunnel leading to the ground collapsed in the turmoil just now, and the entire rock layer was crushed.

“The tunnel we walked on when we came collapsed.”

He summoned a nurse mm and threw a bottle of vitamin drink to Roy who was choked by the compressed biscuits and slapped his chest, and told the bad news with a vaginal face.

Zhou Ai subconsciously said: "So, are we trapped here?"

Tang Fang nodded and shook his head again: "If you use the insect swarm, you will still have a chance to escape. It just takes a lot of time and... it's a bit dangerous."

Cockroaches are experts in hole-making and can dig out a tunnel to lead to the surface. According to data provided by Emma, ​​the current location is about dozens of kilometers away from the seabed. If cockroaches use all their efforts to dig, it should be completed within half a day.

This is not the key. The key is how they can get up after the tunnel is dug. Nighthawk deployed on the island of mushroom blanket just sent a message that due to the fierce plate movement of the three people fighting the "tree demon" underground, the lower half of the island of mushroom blanket collapsed and has now floated out of its original position.

Before laying out the island of bacteria blanket, he asked Emma to analyze the bottom terrain of the sea area. Through the model diagram, it can be seen that this abyss was caused by violent plate impact. One plate submerged during the impact, and another plate raised to form a sea abyss structure. Even the formation of large underground cavity is the result of plate impact.

During the battle with the "Tree Demon", its root system network opened countless honeycomb-shaped tunnels in the nearby strata, causing extremely unstable geological structure in the entire area. If the tunnel is still dug from this area, it is easy to cause strata collapse, failing, and even burying three people alive. Moreover, even if the tunnel leading to the seabed is safely opened, the difficulty of building a mushroom blanket island from the sea abyss upwards and building a mushroom blanket island from the water surface downwards is not the same level. Without the pressure dispersed on the sea surface, the tumor will be squeezed out by huge water pressure.

Zhou Ai didn't ask much because she knew that Tang Fang had always considered the problem comprehensively. Since he said there was danger, it must be unsafe, so she frowned and said, "What should I do? You can't stay here... By the way, we haven't been back for so long, will Tang Lin, Tang Yun and others be anxious on the Hercules transport plane?"

"I have ordered the transport plane driver to tell them that they are having some minor trouble underground and may be delayed for a while."

This is a little trouble. Fortunately, Behemoth supported the surrounding rock formations that were not collapsed, otherwise all three people would be buried alive by gravel and buried with the "tree demon".

At this time, Tang Fang looked at the direction of the river valley and said, "I have a way, go." He jumped down the river valley, went down the river, and swam to the other end of the river.

Roy quickly put on his mask and followed Zhou Ai along the river along the river, leaving the large hollow area. He entered the dim and dull underground valley with water gurgling sounds.

The flowing water that comes from and doesn't know where to go is not cold, but is warm, like the sea water that is warm in summer, suitable for swimming. However, the three of them have no interest in playing at this moment. After leaving the big hole, the river channel becomes narrower, and the flowing water almost fills the tunnel, and becomes more and more urgent.

Tang Fang summoned a king insect and asked it to fix the three people with a whip to prevent them from being dispersed, and move along the turbulent flowing water and the narrowing river.

I don’t know how long it has been. Based on the swimming speed of the king cuckoo, it is inferred that it is about a hundred kilometers away from the large hollow. The river channel has become wider. According to the terrain data transmitted back by the detector, a bend appeared in front. The swimming speed of the king cuckoo slowed down. A hunter appeared in the water and shot three blue beams of light at the stone wall at the corner, opening a cave more than half a person high. The king cuckoo shook his whip and pushed the three people into the cave.

After standing firmly, the king insect and the hunter were taken back, and a mechanical sentry was recruited to set up a force field at the entrance facing the river to prevent the water from entering. Then the mechanical sentry was ordered to use the disintegration ray to continue digging the tunnel forward.

The water level was slowly lowered because the tunnel expanded, and the three people were able to drill out of the water. Roy turned on the searchlight of the C-20a and looked at the stone wall above his head. Condensed water droplets fell down and hit the water surface, making a tick and ticking. Looking back at the entrance of the cave, the transparent position was clear flowing water, as if there were a scenic spot in the aquarium, but there were no beautiful or vicious fish.

Zhou Ai and Tang Fang walked side by side, staring at the tunnel that expanded rapidly under the disintegration rays, and still didn't ask why. It was certainly a pleasure to be able to return to the ground, but it was also a pleasant thing to be able to explore underground with him. She liked to take risks, especially with the person she liked. Of course, it would be more perfect without the light bulb behind it.

More than ten minutes later, the tunnel expanded to nearly a thousand meters, and the water poured into the cave had fallen back to the knees.

At this time, the mechanical sentry stopped digging and opened a tunnel that was enough to accommodate three people on the stone wall on the left side of the tunnel. Tang Fang invited the three to hide in the tunnel, retracted the mechanical sentry, lifted the c-20a and replaced it with armor-piercing grenade, and pulled the trigger towards the stone wall at the end of the tunnel.

The armor-piercing grenade penetrated the stone wall, leaving a bullet hole of dozens of centimeters at first, with some cracks around it. The next second, water seeped out. In just two breaths, with a roar, the stone wall collapsed, and the surging floods wrapped in gravel poured into the tunnel, causing the water level to rise rapidly, and in a moment, the entire tunnel was filled.

Tang Fang greeted the two people, drilled out of the pit, and swam into the long underground river at the other end of the collapsed stone wall.

Zhou Ai and Roy followed closely behind, drilled through the bruises of the stone wall, and suddenly felt a lift coming from under him. The upward turbulence pushed the three people's bodies to climb up quickly.

This long river is very different from the hollow underground valley before. It is not a reciprocating groundwater vein, but a waterway that leads directly to the seabed. Roy was puzzled and asked about the origin of this waterway, so the Tang side conveyed Emma's explanation.

In fact, in addition to some shallow groundwater, the groundwater system is also distributed in the deeper mantle of the planet, and the number is larger, with two sources of water in the mantle.

The first source is that minerals contain some free hydrogen elements. When these hydrogen elements meet oxygen elements, they undergo chemical reactions in the underground environment to form water.

The second source: collide between marine plates, which will cause large-scale stratigraphic faults. While the subduction plates go downward, they will also bring seawater into the ground, thus forming deep water accumulation.

Against this background, after billions of years of evolution, the water in the mantle accumulates more and more, and because of the intense underground activity, the deeper the strata, the stronger the pressure. Once cracks appear due to geological movements, the water in the mantle will surge from deep to the ground like pressure water. The above is the origin of this long river.

Roy praised: "Brother Tang knows so much."

Tang Fang's face was not flushed or breathless, and said, "That's it."

Zhou Ai snorted coldly and said that he was shameless. Only a fool like Roy believed his lies.

Tang Fang laughed a few times, covering up the embarrassment on his face. Even though he was covered by a mask, he was easily seen.

…………………(To be continued, please search for Astronomy, novels are better, updated and faster!

ps:Thanks to honey sauce, Tianma meteor cannon, Baishanjun for the reward u

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Chapter completed!