The capsule tram is not an optical flow shuttle and does not have a teleportation function, but as a tram suspended in mid-air, it travels 100 times faster than a ground tram.

Shen Yun's mobile phone has long been unusable at a depth of 400 kilometers underground, so he can't calculate the specific time, but looking at the scenery flying outside the transparent car, he has the illusion that they are still speeding at the speed of light.

After about half an hour, the sunlight outside the train was not so strong, and the tram slowed down evenly, and the speed of the ground tram was basically restored.

Shen Yun was able to see the situation outside, it turned out that the light was weakened because the empty city had been left behind, and at this moment they came to a barren rocky area.

"The barracks are still built in the desolate wilderness, not on islands rising in the sea of light." Looking at the strange scene of the protruding rocks outside, Shen Yun was a little lost, she was by no means nostalgic for the prosperity of the metropolis, but felt as if she had returned to the reality on the ground, and she couldn't tell whether it was the rock belt in front of her or her own heart that was barren.

Everywhere they went, they had penetrated the earth's crust into the upper mantle layer, so what they saw here was dark green peridotite.

After getting out of the car, Shen Yun looked up at the sky, the sky was gray, there was a momentum of heavy rain in summer, and the sunshine in the city was completely gone. I don't know if this kind of lighting change is whether the artificial sun automatically adjusts to different areas, or whether it is a purposeful setting of a space force.

Cao Fang asked Yao Zheng: "Is Xie Tuan still staying in Field C now?" Where are all the people of the elite brigade concentrated? ”

Shen Yun noticed that Yao Zheng's face changed a few times when he heard this, and then replied in a rather sad tone: "The conditions in Field C are the most difficult, Xie Tuan stayed there all night, I see him ......"

Cao Fang's smile was quickly put away, and he raised his hand to stop Yao Zheng and said, "Then we won't go back to the General Headquarters, let's go directly to Field C." Shen Yun just arrived, just so that she could see the training of a group of special forces. ”

This barren mountain, far from the city, is where the base of the First Regiment of the Space Force is located, and it is also the place where my father worked before his death!

Shen Yun wanted to bend down and prostrate on the hard peridotite and listen to the sounds of the depths of the earth. She longed to take the rhythm as her father's heartbeat, and her cheek was pressed against her father's chest, so that she could enjoy the warmth of returning home that she had not seen for a long time.

However, standing in front of her were two soldiers who had just met, and she had to hide her emotions carefully, so she forcibly held back the tears that were rolling in her heart, only nodded in agreement, and followed the two towards the hinterland of the barren mountain.

Walking with a stuffy head, Shen Yun's mind was full of his father's figure. Just when the tears were about to be uncontrollable, Cao Fang said in her ear: "You look to the right front, can you recognize those devices facing the sky on their backs?" ”

Cao Fang distracted her attention at this time, I don't know if it was intentional or accidental, in short, Shen Yun was very grateful, and quickly looked up in the direction he pointed, and saw two large rows of white triangular brackets at least ten meters high rising from the ground. At the top of the bracket, a nine-meter-diameter Cassegrain antenna is installed, which opens its mouth to the sky and exhales ultra-high frequency electromagnetic waves that are invisible to the naked eye.

What was particularly strange to her was that between the main and secondary reflectors of each antenna, there was a mirror-like metal ball that was moving back and forth along the inner wall of the pot. There is no contact surface between the metal ball and the round pot, and there is no power source, and the only explanation is magnetic levitation. Judging from where Shen Yun was standing, the metal ball was the size of a fist, and it was estimated that the actual size could be like a football. This is the first time she has seen this kind of design added to a large antenna array.

Shocked by the magnificent momentum in front of him, Shen Yun replied: "I know the name of the antenna, it's called Cassegren, but I have never seen such a large-scale Cassegren antenna community. Thinking about the communication within the Light Continent, not only is it not blocked by the underground rock formations, but it is faster than the ground. It's just that steel ball, what is the role? ”

Cao Fang said noncommittally: "What you said is right or not, you still hit half of it like just now." ”

Shen Yun stared at him with wide eyes, puzzled.

Yao Zheng on the side said with a smile: "Please give me a chance to serve Xiao Shen as well, and let me act as this temporary guide." ”

Cao Fang smiled and nodded.

Through Yao Zheng's explanation, Shen Yun understood that such a huge set of Cassegrain antennas had nothing to do with optical continental communications, and were completely used for military purposes.

In the military base of the Space Force, there are four military training sites that simulate the cosmic environment, from the solar system to the Milky Way and then to outer space. However, compared to the most important field C, those three training grounds are insignificant, and field C is also the place where the elite brigade just mentioned by Cao Fang and Yao Zheng is located.

The C-field is the most important because it is the most ambitious and complex scenario, simulating the whole universe as mankind has known it so far.

Not only the First Army of the Chinese Space Force, but also all the war groups under the Military Committee of the International Space Alliance have complete military training grounds similar to the space environment. Fields S, G and O are usually held in both fully enclosed and semi-enclosed manners, and are restricted to the personnel of the regiment or to the regiment in conjunction with other regiments in the country. In addition to being retained as an internal training camp, the training camp in Field C can also be opened to the outside world as a whole, and the scale of opening is large enough to cover the entire underground light continent.

It is the Cassegrain antenna group that undertakes such a heavy task of transmitting signals in the air. When a cross-border joint military exercise is held, all relevant departments can watch the whole view of the exercise through a large screen in their headquarters and have non-stop holographic communication.

From an operational point of view, with Cassegren, no matter which regiment can be immersed in military operations with other legions, the orders issued by the Military Commission for the whole army can also be transmitted to every legion in the Light Continent within a second.

Such a large contingent of space coalition forces can not only achieve side-by-side combat without geography to test the combat strength of joint operations, but also divide them into two sides for confrontation assessment.

Military operations in all combat domains are maintained by the Cassegrain antenna array, which is no longer small in scale on the Light Continent, but it is still continuing to expand in order to realize the integration of real-time communications on the ground as soon as possible.

As for the metal ball, it is called the light wave encryptor, and through the invisible infrared light waves it emits, it can greatly shield the spilled communication microwaves and prevent the enemy from intercepting classified information from the air.

Shen Yun still had questions to ask, she clearly remembered that Cao Fang had mentioned that these advanced technologies, which far exceeded the scientific community on the ground, largely came from alien civilizations, so did the aliens who provided the technology belong to friends or enemies? Could it be that earthlings face more than one kind of alien creature? And how did they discover this planet called Earth? Could it be that those aliens have a more powerful military power than the Light Continent?

Unfortunately, a series of questions could only be saved for later, because the two had led her to a silver light hut.