The complex terrain of underground space is not a place for air force to use, but tunnels hundreds of meters high are connected directly up and down to each honeycomb foam-like underground space, complicating the entire underground space environment.

Anyone with World War II technology level and who has completed the manufacturing of standard metal parts should be able to manufacture element fuel rod technology in the underground world. The luminous seaweed rich in elements in the underground world is the ultimate strategic resource that directly opens up black technology.

Three years ago, the lords of the underground world received news that the exploration troops in the surface world were completely destroyed. The nobles who led the army were completely destroyed and were shocked after their death. Only these nobles with good magical qualifications had normal intelligence. Unfortunately, they used magic power habitually on the battlefield, and all of them were tragic.

The remaining soldiers who fled back to the underground world had problems with their narrative abilities. Ask them what they encountered on the surface? These low-level demons who survived by dense shrapnel were covered with fear and repeatedly narrated words such as "fire, blood, huge steel flying dragons, fierce roars" and so on, but what is the specific and complex situation? These brave creatures fighting on the front line can obey orders, but it is simply a nightmare to expect them to flexibly feedback the battlefield information.

Three years ago, the detection team that had just climbed out of the surface was annihilated, making the entire underground world quiet for a while. However, now the underground world mechanical spiders are fighting in complex caves. Machine guns and hydrogen-burning weapons have caused huge damage in the relatively narrow underground space, because the height of the underground world rock space is no more than 600 meters, and the radius of a space is no more than 50 kilometers. Therefore, weapons do not require long range. Even if you have this long range, you cannot use this long range weapon ballistic in this honeycomb-structured underground world.

Therefore, the combat effect of this spider mecha is very amazing. At the same time, it also allows the Dawn Republic to obtain a lot of data on combat in the underground world. Humanoids evolved from humans to adapt to the surface environment. They can climb on rock cliffs, run in jungles, and hide on trees. However, the underground world now seems that the biological forms that survive in rock cracks are very suitable for combat.

The conflict in the underground world is becoming increasingly fierce. Because there are too many sanks in the underground world that can hide, even the most complex mountainous areas on the surface are quite marvelous compared to the underground world. What impact does complex terrain have on modern warfare? Taking the Himara Mountains on Earth as an example, the Indian military will wipe out the guerrillas again, and the heavy artillery cannot move, and helicopters will crash constantly and can only rely on infantry to fight.

The height of the rock dome in the underground world is destined to be used without aircraft. Therefore, there is no way to expand the heavy artillery. In this underground world, it happens to be a good battlefield for spellcasters to fight. Even if the Dawn Republic has magic probes and participates in this underground world war, even if the magician uses magic, even if he is detected by the magic probe, due to the complex terrain in front, you cannot carry out a strike. It is like a battle in a room. When you hear the enemy's gunshots in a room, you can only know that the enemy is in front, but you cannot find it and destroy it. On the plain, on the battlefield where snipers on both sides compete, whoever shoots first will directly expose your position.

The underground world war observed by Zhao Weiguo through his talent, and then the scenes that showed the Emperor League of Emperor Long and Jiang Le made these two colonels shocked the complexity of the underground world.

In the underground world located directly south of the mainland, this is where the three Evolutionary Colonels of the Emperor League have placed their bases. Now these three colonels have barely occupied twelve underground world cavities. These cavitys are large in length and width, with a diameter of 30 kilometers, a height of 400 meters, and a diameter of only 7 kilometers.

It can be seen that these underground spaces are difficult to occupy. Of course, after an underground cavity is occupied, it is basically a perfect rear, and there is no need to worry about conventional weapons. Even nuclear weapons can only destroy one cavity at most, and the places surrounded by other cavitys are still protected. Of course, each cavity is a strategic location, and the contact with other cavitys is often several small caves.

Some cavity completely occupied by three evolved officers were also attacked. The lords of the seven underground worlds have discovered that the underground alliance is leading the cave man in the underground world. These underground lords reacted quickly. First, the lords around the underground alliance forces united to attack the underground alliance established by the Knights of God.

Three of the underground cavity have become battlefields. What Zhao Weiguo observed is an underground space with a length of fifteen kilometers and the narrowest four kilometers. This underground space is like a quilt supported, but this small underground space and sixty kilometers of up and down, left and right have as many as 482 rock tunnels. The largest four tunnels have a maximum diameter of more than one hundred meters. Two of them are in the hands of the underground alliance, and the other two are in the native races of the underground world. The war started in this complex environment.

The huge spider was moving forward almost step by step. In the dark underground space, you can see the light dragged by the bullets, spraying towards one side with a stream of light. However, the huge magic elements in the other complex terrain formed in this narrow space like a vortex, huge stones separated from the rock dome and pure hydrogen chloride separated from the salt mine. Hydrogen chloride was melted into the water and was concentrated hydrochloric acid. The acid rain released by these magic races in the darkness sprinkled on the area where the four-legged mecha was located, and the eroded hissing sound suddenly sounded. A large amount of thick acid smoke rose up as the acid rain fell to the ground. However, at this time, a large number of slippery crawled against the ground like loaches, and the scales on their bodies flashed and refracted black and bright colors.

At this time, a large number of bullets were sprayed out of the sour smoke. Some of the underground creatures who launched the attack were fixed to the ground by the bullets, and their fangs were turned out to death. However, the shooting from the sour mist was obviously blind and did not have the effect of fire suppression. These underground demon soldiers who launched the attack looked vicious and knew at a glance that they were carnivorous creatures had a very simple mind, but they were also very brave.

Soon they approached the machine gun firing position. These demons with very strong muscles rushed to the vicinity of the mecha and pulled the fragile parts of the four-legged mecha joints. The huge fist smashed open the glass cockpit and bent the guardrail of the anti-theft window structure. The sharp claws pulled the head of the mecha driver, and then pulled it out of the cab. Sometimes it was pulled too hard and pulled the head down.

However, just as the demon soldiers slaughtered the underground alliance's mecha soldiers, another position made a muffled sound, and gas tank-like things were thrown over. After these gas tanks fell into the position, half a centimeter later, the explosives evenly distributed on the outer edge were blown up. A large amount of gas overflowed, and the flames swallowed everything in an instant. The huge fire ball swallowed up from the position and floated directly to a position two hundred meters away from the dome, and it became flame ripples and quickly disappeared in the sky.

The war process was extremely cruel. The two sides fought in this space, and a large amount of oxygen was consumed. The battlefield was covered with gravels mixed with blood. The two sides repeatedly sawed along their control lines. Magic creatures took turns to fight in this narrow and difficult-to-observe space. The huge rock puppet advanced with firepower, and the chest was directly broken by armor-piercing bombs, and finally fell down. It smashed on the position where the mecha was located like a rocking mountain, burying the three mechas on the position that had no time to retreat.

Seeing such a hot war scene from Zhao Weiguo, Wang Long looked at the mecha soldiers in the training ground in front of him and asked Zhao Weiguo: "How long have they fought?" Zhao Weiguo said: "A month ago, the war began to break out here. The hot war you saw only happened eight times in this month. Each time lasted no more than three times. It should be that Marshall and their ammunition supply was problematic. The iron in the hydrogen tank can be obtained by electrolyzing iron oxide ore, hydrogen can also be obtained by electrolyzing water, and the synthetic ammonia system can also be synthesized by electric heating and pressurization. In short, they have to smelter all industrial materials by electricity... But their electricity consumes too much in the war."

Jiang Le asked: "If we enter the underground world, how should we fight this situation?" Zhao Weiguo smiled and said: "Our chemical raw material is coke hydrogenation to produce alkane ethylene. Faced with such a war, my suggestion is to use cloud bombs to create a firewall within a time, and then let the mecha infantry use flamethrowers to spray them along the channels in various underground spaces. The use of flames in narrow spaces will expand along all gaps."

Jiang Le added: "We should also pay attention to the narrow passages that some mecha infantry cannot enter, but creatures in the underground world can pass through. They cannot give them an opportunity." The three officers of the Evolution of the Emperor's Alliance carefully discussed the situations that the Dawn Republic needs to pay attention to if it needs to use force in the underground world.

However, keep looking at a bigger place, in fact, everything is planned by the highest layouter.

Tianyun Space, an existence that often intervenes in Yuan Miao's long history, is ready to arrive again after a thousand years in Yuan Miao's history. In the eyes of these monsters who can cross many planes in the void, there is a time period for the invasion of planes like Yuan Miao and Titan. This time period is actually from the end of the magic empire, and it ends with Ren Di's time as the basis and 20,000 back.

The historical line of this time period is very stable, and it is a fixed historical line mastered by the time-travel monster. One of the history of tens of thousands of years is inserted at will, and the flow direction of the historical line is to form another parallel plane. That is, the Tianyun Space can freely place time travelers in this 40,000 years. A plane historical line developed by itself is developed. Just like a TV series, the audience around the TV series can play back and forth, and during the screening process, they can insert their favorite actors into the performance.

This historical line, the Time Travel Monster started to be released from the end of the Magic Empire, and has been interfering for 40,000 years. It has mastered this historical line. In the next process, it will slightly advance the first time period, and take back the last time back to the time traveler's time, and slightly push back the next time. With Tianyun's releases again and again, it can be seen that the time period controlled by Tianyun space in this plane is also constantly expanding.

Of course, the time travel monster sends the time traveler and does not understand all the situation in this plane. The time travel monster is the existence of the vertical and horizontal time plane layer. The understanding of a plane space depends on the tentacles of the time travel monster that interferes with the world, and the time traveler who belongs to the time traveler who explores it.

As the number of times is put, you will become more and more familiar with the places where the time traveler can move, and you will understand the future development of any direction of the plane. Just like the protagonist of tomorrow's edge will know the various changes and changes caused by the world in a day after returning to the beginning countless times. Tianyun will know how to intervene in the task so that the subsequent historical development of the world will meet his own requirements. Then the plane will be completely mastered by Tianyun.
Chapter completed!