It was just the second year after the first Legion began the circum Loulan domain visit program.

In the presidential palace of the Earth Federation, there is a top secret plan under way, which is named the interstellar Great Wall Project by Lin Zhen.

The plan aims to build an interstellar Great Wall to eliminate the potential threat of the babavi Empire to the Federation, ensure the stable development of the Federation in the next 50 years, and lay a solid foundation for seizing the entire Orion Arm.

Everyone knows that for the fourth level civilization, strategic depth is meaningless. After all, the leap engine is cheating, which makes it impossible for people to defend effectively. This is why the babavi Empire banned the sale of equipment.

After the fourth level civilization, it has always been an important issue for the Federation of mankind to ensure the security of its territory. For more than ten years, no effective measures have been worked out.

Until the alliance joined the xi'an-o alliance, it saw [transition blocking technology] and [transition blocking countermeasure technology].

Because it is only the technology in the early stage of level 5 civilization, it can be done with all the technical data for level 4 civilization.

Maybe many people will say that even with the technical data, it is impossible for the fourth level civilization to understand the technology of the fifth level civilization. In fact, this is a wrong probability.

Let's talk about how a level 4 civilization can become a level 5 civilization. Isn't it necessary to develop the landmark technology of a level 5 civilization before it can be officially promoted to level 5?

If a civilization can't study cross level technology, then all civilizations don't need to be promoted, let alone now that mankind has all the technical data.

The most important thing is that under Lin Fan's cheating, human beings directly developed the brain development potion. This kind of abnormal thing can be said to have no level five civilization.

Therefore, after Bai Zixuan's team arrived, the first task that ED gave Bai Zixuan was to take his team to understand these two technologies.

It took a whole year for Bai Zixuan and his team to achieve good results.

Although the test equipment has not reached the range of 1 light-year in the technical specification, it has also reached the range of 0.79 light-year, and can be manufactured and used in large quantities.

At the beginning, Lin Zhen and Ed's plan was to install a transition blocking device in each stellar system, and to deploy a large number of detection devices within 0.79 light years around.

In this way, no matter which star system the opponent wants to attack, it will be affected by the transition blocking device at a distance of 0.79 light years, and then exit the transition state.

Then there are only three options for invading civilization!

First, it takes a few years to travel the 0.79 light-year distance by sub light speed, and in this process, it will be detected by many detection devices deployed by the Federation.

The second is to jump to the nearby star system, and then follow the same path as the third-class civilization, provided that the nearby star system is not equipped with transition blocking equipment.

Three is retreat!

This is the serial fortress plan originally drawn up by the two men, which directly built all the star systems in the territory into fortresses, so that the invaders could not speak.

However, with the expansion of human territory, and now there is such a huge Loulan star, their ideas have changed and become more crazy.

As a result, a star Great Wall project appeared, which shocked everyone. Anyone who has read the contents of the plan is shocked by the large scale of the project. Many people even call Lin Zhen and ED two lunatics.

Yes, it's crazy.

How crazy is it?

As we all know, Orion's arm is about 20000 light-years long, and its width and thickness are much smaller, but it is thousands of light-years.

Lin Zhen and ED plan to build an interstellar Great Wall with a thickness of 10 light years on this arm by using transition blocking equipment.

According to the calculation, if the Federation of humans wants to complete this plan, it needs to manufacture at least 40 million transition blocking devices for networking deployment. Once completed, the Orion Arm will be completely cut in half.

From then on, if the babavi Empire wanted to invade human territory, there were only two ways.

One is to slowly cross the ten light years through the sublight engine, which is expected to take at least 30 years!

The other is the honest way to walk the star, but it will also face the defense advantage of human beings. If you want to break through, you have to pay at least 5 or 6 times the battle damage of human beings.

It's no use even if the babavi Empire obtains [transition blocking countermeasure technology] from the Vera alliance. As I said before, the [transition blocking countermeasure technology] and [transition blocking countermeasure technology] are used in pairs.

After all, any civilization using [transition blocking technology] can set its own blocking frequency. Only by knowing this frequency and setting it in the transition blocking countermeasure device, can it pass the transition normally.

The blocking frequency is infinite and can be changed at any time, so it is almost impossible to crack it.

And the best part of this project is that, according to what humans know about the Orion Arm, there is an area in the center that seems to be cut off. There is no star system within a full 10 light years.A year ago, Lin Zhen secretly sent many exploration spaceships to this starless area.

Not long ago, the news it sent back was even more surprising. In that blank stellar region, there was only one star path connecting the two star systems.

That is to say, as long as the plan of the interstellar Great Wall of mankind is achieved, then the star road will be the only way for the babavi Empire to invade human territory. As long as human beings lay heavy troops here, they can ensure the absolute security of the whole territory in the rear.

At that time, there will be a very interesting situation. Human beings can cross the interstellar Great Wall at will with the help of the jump blocking confrontation device, and attack all parts of the babavi Empire at any time and anywhere!

However, the babavi empire could only reach the human territory through the only way of the star, which took more than three years. Moreover, it had to face the heavy human troops with extreme defensive advantages at the exit of the way of the star.

Now, the whole Federation has started the interstellar Great Wall Project in an all-round way, frantically arranging mass production lines in various star systems, and calculating to complete the production of all 40 million sets of transition blocking equipment within five years.

As for the resources needed, Lin Zhen had a plan for a long time. At present, the human reserves and the resources contributed by the subsidiary civilizations are enough to support the construction plan for two years.

In another year, the Federation's third army will be formed. Their first task is to follow the pace of the first army to enter the Loulan region and clean up all the civilizations assessed by the first army as having insufficient potential.

Spanning a full 500 light-years, the internal resources, let alone a great wall of stars, can be built more, and it is only based on plundering the exploited resources of these civilizations.

As for the untapped resources, there is a huge surplus in the construction of 100.

Therefore, this is not only a great cleansing of the whole star domain, but also a great plunder, which is the main theme of the interstellar age.