Busan, Korea's first port and second city, was once one of the busiest ports in the world.
But in Busan at this time, there was not a single cargo ship coming and going at the port; there were no congested streets in the city; there were no noisy crowds in the high-rise buildings.
Instead, there were various warships, armored vehicles, ground artillery, and temporary military fortifications.
The crowd has already evacuated to the nearby area, which will soon become a battlefield between humans and Zerg.
The world's attention is focused here again. The last failure happened just one day ago.
The industrial strength of Sakura Country is more powerful than that of Goryeo. Even with Baiying's help, can they really hold on?
In the combat headquarters, commanders are urgently discussing countermeasures. The experience of another war yesterday can be used immediately today.
How to block the attacks of three beetles has become the focus of their discussion.
"The beetle's defense is amazing. In close-range offensive and defensive battles, tank armor-breaking and armor-piercing projectiles are more effective against beetles than short-range missiles. We need to reserve a large number of armor-breaking and armor-piercing projectiles."
…
He Xingzhou did not pay attention to this war, because the insects were also approaching the Magic City. According to the current speed, they would be able to reach the city within fifteen days!
At this time, most of the Great Steel Wall in the Magic City section has been built, and it should be barely completed in fifteen days.
This is not enough!
Thousands of red beetles, green beetles, and a hundred black beetles, carrying mutated creatures, broke through the defenses of Chozi District.
What if there were more and stronger Zergs coming to the Demon City?
"The Great Steel Wall has no problem blocking mutated creatures and first- and second-level Zerg." He Xingzhou thought to himself, "Three-level Zerg has some difficulties, and fourth- and fifth-level Zerg, such as the black beetle. Just rely on cannonballs and missiles. It may not work!”
"If there are other more advanced Zerg species... the risk is too great! We must upgrade our weapons and equipment as soon as possible."
The research and development of weapons in the Xuanwu Project had begun a long time ago. He Xingzhou originally wanted to improve laser weapons first, but the appearance of the beetle made him change his mind. He wanted to improve the electromagnetic gun first!
Laser weapons and electromagnetic weapons have different advantages. If you fight against a level 5 black beetle, the laser weapon will need to burn it for several seconds before it can be burned to death.
The kind of laser weapon that can vaporize it instantly cannot be made now.
The electromagnetic gun can gain huge kinetic energy in a short period of time. Even a fifty-meter-thick steel plate can create a big hole! It shoots in an instant burst, while laser weapons are more like continuous output.
"In coastal defense warfare, although laser weapons have a long attack range, they are easily affected by sea water and weather, and cannot kill beetles instantly; in comparison, electromagnetic guns are now more lethal to beetles."
He Xingzhou analyzed it and decided to improve the electromagnetic gun first.
He summoned the quantum optical brain and opened the weapon technology tree.
"Unlocking the basic induction electromagnetic gun requires 300,000 units of energy."
"Unlocking the basic electromagnetic railgun requires 500,000 units of energy."
"Unlocking the basic plasma electric heating cannon requires 700,000 units of energy."
"Unlocking the basic electromagnetic heavy (two-shot) cannon requires 1 million units of energy."
Among them, Shenzhou has mastered the relevant technology for the basic induction electromagnetic gun. He Xingzhou directly entered the data and unlocked it.
However, this kind of electromagnetic gun uses an accelerating coil fixed in the barrel. When it passes an alternating current, the alternating magnetic field generated will generate an induced current in the projectile coil. The magnetic field of the induced current interacts with the magnetic field of the accelerating coil current to generate an electromagnetic field force, which accelerates the projectile and launches it.
The electromagnetic railgun lays electromagnetic guide rails. After current is passed, the guide rails generate a strong magnetic field. Under the action of Ampere's force, the projectile will be ejected at a very high speed, theoretically even reaching sub-light speed.
The electromagnetic railgun is also very lethal, but if it is manufactured now, it will face a problem, that is, the ultra-high lethality requires a longer acceleration trajectory.
The plasma electric heating gun uses high-pressure plasma to heat and push the projectile forward.
As for the final electromagnetic reconnection gun, its principle is the same as that of the coil gun, but it uses another method of continuous reconnection.
It combines the advantages of a coil gun that can launch large-mass projectiles and a railgun that can launch ultra-high-speed projectiles, and can give the shell a higher peak acceleration force, making it more powerful!
At present, the mainstream ones in the world are induction electromagnetic guns and electromagnetic rail guns, and there is no mature electromagnetic reconnection gun.
He Xingzhou unlocked all four types of electromagnetic guns in one go. These electromagnetic guns are used in different scenarios. There is no saying that one is stronger than the other, but the manufacturing difficulty is different.
In the current situation, the most suitable one is the electromagnetic reconnection cannon, which is more powerful and does not require the construction of an ultra-long electromagnetic track for the time being. Its turret is a rectangular parallelepiped structure and can be manufactured in a short time.
Recently, the unit energy of the quantum optical brain is quite sufficient, because a nuclear power plant has been built on the route of the Great Steel Wall, and He Xingzhou has obtained a new energy source.
He Xingzhou digested and understood this information, and directly contacted the Electromagnetic Weapons Research Institute in the cloud, and pulled the team responsible for researching electromagnetic guns into the channel.
"Everyone, I found a way to design an induction electromagnetic gun!" He Xingzhou said.
"What method?" asked the team leader Bao Xiangbei. He is an expert in electromagnetic weapons and has led the team to design multiple electromagnetic weapons.
He Xingzhou said: "The design consists of two rectangular coaxial coils at the upper and lower positions, with a gap in between. The emitter is a rectangular parallelepiped that can pass through the gap between the two coils for accelerated motion."
"Because the projectile carries a continuous current, the magnetic field generated by the projectile seems to "cut off" the magnetic field of the accelerating coil when it passes through the accelerating coil, and then reconnects with the magnetic field of the next coil very abstractly."
"During this process of repeated reconnection, the projectile is continuously accelerated, and the advantages of the induction electromagnetic gun and the electromagnetic rail gun are obtained at the same time!"
Everyone understood the principle, and He Xingzhou sent over a structural diagram he designed.
This is a columnar electromagnetic reconnection gun, which mainly contains a columnar armature. The armature is wound by a columnar asynchronous induction coil.
By controlling the current, the effects of electromagnetic acceleration and magnetic field reconnection are achieved.
"With this design, if we can accurately control each reconnection! Then the projectile can continue to accelerate in a small volume, and eventually achieve the same effect as an ultra-long-distance electromagnetic rail gun!" Bao Xiangbei said, "We must try it immediately one time!"
He Xingzhou said: "It's best to make samples immediately. If the test is successful, mass production will be sent to the front line immediately!"
Bao Xiangbei also knew that it was a time war and he needed to race against time.
He immediately said: "We will start now. Once the test is successful, we will start manufacturing immediately!"
…
While they were studying the electromagnetic reconnection cannon, the battle in Busan had already begun.
The previous process is similar to that in the Choshi area of Sakura Island. The Zerg first uses low-level mutant creatures to attract artillery fire, and then sends beetles to land after almost all the energy is consumed.
Because of their previous experience, they were not so embarrassed to deal with it this time.
The specially equipped tank armor-piercing and armor-piercing shells caused a lot of damage to the beetles, but when the black beetles landed, the damage to them by the tank armor-piercing and armor-breaking shells was also limited.
At the entrance to the sea, the Zerg attacked the fleet and several battleships were destroyed.
"If we hold on for another half hour, the mutated creatures will be almost dead!" Commander Jin Chenghuan shouted in the headquarters.
"We must defend the coastal defenses!"
They killed half of the first batch of black beetles that landed, leaving less than fifty. If they survive, there is still a chance to hold on.
But something desperate happened. Originally, they thought there would only be a group of black beetles, but a new large black spot appeared in the ocean. A group of more black beetles appeared, followed by various red beetles, The total number of green beetles is estimated to be six to seven thousand.
That scene was like countless heavy armored vehicles charging the defensive line!
Under the water, those giant Zerg are also attacking the defense line.
The drone captured a tentacle dozens of meters long appearing in the water, tying up a small ship and pulling it directly into the sea!
"Boom!" A Tomahawk cruise missile hit it, and a large area of scarlet appeared in the ocean, but the guy did not float up, but disappeared into the water.
In the deep water, the monsters are frantically hitting the underwater interception net, and some can even bring their own electric current. The interception net has collapsed and the entrance to the sea has been breached.
The commander of White Eagle looked at the defense situation and said: "Retreat, our missiles are ready."
"Retreat!" After Jin Chenghuan gave the order, his whole body seemed to have lost all strength.
This is Busan! Unlike the Choshi District of Sakurajima, even if all the beetles are killed after retreating to the land defense line, the city will still suffer heavy losses!
And the monsters have already opened the entrance to the sea. Starting from the Nakdong River, they will enter the island.
Greater disaster and chaos are coming!
Their soldiers retreated to the land defense line, and countless missiles fell, blasting away the Zerg around the coastal defense line!
Along with it, the once prosperous first port on the island was reduced to ashes!
"Busan has fallen!" At this moment, countless islanders were crying.
"Our home is gone!"
"The Zerg have entered the river and will go straight to the inland!"
"What should we do next?"
No one can give the answer... After surviving with a broken arm, they are greeted by more confusion and fear!
…
"Two, two coastal defenses failed!" The entire human world was shocked by this!
Although these two places are small in area, they are among the world's top industrial and technological powers.
With their military strength, they are still unable to defend the entrance to the sea in front of the Zerg.
If the Zerg land from elsewhere, can they hold it?
Pessimism has spread in human society, and some people have even begun to feel despair, preaching that the end of the world is coming, saying that they will give up resistance, or go to heaven in advance before the Zerg comes.
Some people began to indulge. Instead of being wiped out by the Zerg, it would be better to be happy for a while before death.
Some people and organizations have also begun to call on all mankind to unite to resist the Zerg! Develop more advanced military technology and so on.
Various phenomena emerge in endlessly.
A piece of news brought the world's attention to China again.
"The third wave of Zerg has already approached China's Magic City! Within ten days, I'm afraid it will land!" International media reported this news.
"There's nothing you can do! Humans are no match for the Zerg, so run away for your lives!"
"Learning from the experience of the previous two times, you can just abandon the Magic City and use missiles to kill the Zerg!"
"The end of the world has come, and only those who believe in the God of Oran can find refuge and relief!"
"Humanity has completely given up on the ocean and retreated to the interior!"
"Hey, this time, many people are going to die again!"
There is plenty of pessimistic news.
Because of the two failures, even Chinese netizens felt the oppression of the Zerg.
They couldn't help but wonder, "Can we really hold on?"
Another news came. It is said that the number of Zerg attacking the Demon City this time is larger than the two groups of Zerg that fought before, and it is more than them combined.
This news makes people restless.
"There are so many Zerg, what should we do?"
"The Magic City must not make any mistakes, otherwise the Zerg will soon spread across the country through the Yangtze River!"
"On land, even if there are bugs and mutant creatures, we can hunt them. But if they are in the river, how do we catch them?"
"How can we retreat if there are more than 20 million people in the city? Moreover, it is one of our economic centers. If we go to Chozi and Busan again, we will be hit hard!"
People all over the country are paying attention to the Magic City.
At this time, Xuanwu executives released a message: "After the day and night struggle of the general public and soldiers, we have completed the construction of the Great Steel Wall along the coastal section of the Magic City."
"The Great Steel Wall is ready for use, we will protect the safety of the Magic City!"
As soon as the news came out, people were immediately excited.
"It was built so quickly! It's a miracle!"
"We have the Great Steel Wall, so we shouldn't fail like them!"
"The Great Steel Wall will be tested before it is built. I hope it can become a solid barrier for us!"
"@魔都, come on, we are with you!"
…
The Zerg horde is getting closer and closer. Near the sea, Xuanwu troops dispatch ships and fighter jets to carry out bombing every day to reduce the number of mutated creatures and Zerg as much as possible.
At the Electromagnetic Weapons Research Institute, the electromagnetic reconnection gun designed by He Xingzhou was successfully tested and was urgently delivered for manufacturing.
He Xingzhou requested that at least one hundred electromagnetic reconnection cannons be built within ten days.
In addition, he also specially designed a large multi-stage electromagnetic reconnection cannon, which uses magnetic field superposition to double the thrust of the projectile. The power will be dozens of times more than those of single-stage electromagnetic reconnection cannons!
In order to have it manufactured before the battle began, He Xingzhou personally went to the military factory to guide the manufacturing process.
Eight days later, Magic City.
Most of the high-rise buildings near the sea in the magical city have long been empty, and people have evacuated.
Naturally, there is no way to completely evacuate the huge Magic City urban area, and most areas still have to live and work normally.
It was after five o'clock in the morning, when many people were still asleep. At this time, the piercing sirens pierced the sky, and then the same sound rang out in all streets, communities, and houses.
This is an air raid alert, and this is not a drill!
