It wasn't the first day he had seen the morning on the A floor, and at an altitude of more than 6,000 meters, the sun seemed so close to the ground that it seemed to be within reach. Nan Qiyun and the four of them went directly down to the F floor through the "elevator". There are already military personnel in charge of reception.

They traveled by helicopter to their destination. In the era of the building, because the space between the B-F floors was not too high, the original flying tools were gradually replaced by low-flying aircraft such as helicopters.

The Sahara Desert, located in the former northern Africa, in the former edifice era, is a world-famous forbidden area of life, only a handful of human beings can live through the entire desert, as long as a gust of wind and sand flying, adventurers may lose their way, extreme drought and heat, extreme temperature difference between day and night, so that countless explorers died here. After the construction of the building, although human beings have carried out various environmental improvements in the Sahara Desert through various means, various plans have failed due to the harsh environment. Over time, the desert has expanded to cover almost all of the 20 districts and is poised to grow.

It was nearly evening when we reached the designated coordinate location, and a red sun hovered over the horizon in the far distance of the desert. Even though it was just a visual effect created by the building's system, Nan Qiyun still thought of a verse he had learned.

The desert is lonely, and the sun sets over the long river.

The helicopter took off, and due to the uncertainty of the desert environment, according to the plan, the four people of Nan Qiyun will notify the personnel who came to meet them to return after the mission is completed.

The wind and sand are blowing, and not far away is the site of the headquarters of the "20-00" arms group. The magnificent buildings stretch endlessly, and in the center of all the buildings is a metal building with a height of more than 100 meters, even after a hundred years of silence, it still shows the superb wisdom of human civilization.

They came to the front of the headquarters. Access to the headquarters floor is an extremely spacious open-air passage. Nan Qiyun pushed the metal door.

After a long period of wind and sand, the metal door was already overwhelmed, and under his guidance, it collapsed with a bang.

"Two hundred years ago, the level of human beings was already so high." Han Xian couldn't help but sigh.

"Mankind has gained too much advanced technology from the ruins of prehistoric civilizations, and it has made a huge leap forward at that time, otherwise how could there be a perfect edifice system today." Chu Han was noncommittal to Han Xian's words.

Most of the buildings on the periphery of the headquarters were former weapons production sites, which have long been abandoned, and the equipment inside is covered with heavy yellow sand. The factory was empty, the footsteps could be heard clearly, and the sound of wind and sand hitting the metal walls outside the factory could be heard.

They found no sign of anyone moving.

Further inside, you will enter the headquarters building, where the executives of the "20-00" group are located. According to information provided by the military, many of the important documents in the building were not destroyed or relocated because of the haste with which the evacuation took place and because the government did not request it.

In the process of advancing layer by layer, they came into contact with a large number of materials on advanced weapons and equipment. The level of weapons of that era is basically representative of the current level of weapons and equipment, which is due to the fact that there were almost no wars in the edifice era.

The 25th floor, the highest command center of the "20-00" group. Here you can overlook all the buildings of the entire group, as well as the flying sand outside the group headquarters. Unlike the 24 floors below, everything here is neatly arranged, and everything in the room, even the corners of the walls, is spotless.

It's not like a nearly two-hundred-year-old room setting.

Chu Han was the first to arrive at the desk by the window in the room. There was a thick stack of materials on the table. At the top of the table is a model of the time-bomb at the crime scene. "What we're looking for." He handed over the information to Nan Qiyun.

Nan Qiyun flipped through the documents little by little. Except for the first one, the rest of the parts are almost indistinguishable from the various materials seen on other floors before, and judging from a model map and the situation on the scene, it seems that there are no other clues other than that someone has been here. He carefully flipped through them one by one.

The last few are connected. Nan Qiyun put down the documents he had seen, and the last few documents were a large picture connected together. He slowly spread the figure on the ground.

Everyone's heartbeat raced at that moment, the drawing was huge, but there was only one thing drawn on it. It was a behemoth that existed only in the coalition government's indefinite postponement of the plan - the Star Battleship. Through the drawings, Nan Qiyun and the others could clearly feel the cold murderous aura emanating from the battleship. It is the ultimate weapon that only exists in the impression of human beings, and just one starship has the potential to cause turmoil in the entire human world, and this is not a weapon that should exist in this era of peace.

But here it is the drawings.

Chu Han used an instrument to find out the age of the drawing.

The time is shown as one year ago. A year ago, on Earth, a person, or an organization, here or not, created this world-shaking drawing. And now, here it is. Nan Qiyun didn't dare to imagine whether there was already some unofficial organization or force that had begun to turn the model on the drawing paper into reality step by step.

He scanned the drawings into the storage device he carried with him.

"Team leader, there seems to be something else there." Han first noticed that a small page of paper was peeking out under the table, which was not too conspicuous due to the light. He walked over and pulled the page out.

This is a drawing of the overall architecture of the "20-00" group.

Nan Qiyun pointed to a point on the drawing. "Basement? I didn't even notice this place when I came. ”

"Probably the only place left that hasn't been investigated." Chu Han nodded.

The entrance to the basement level is outside the entrance to the Headquarters building. The automatic door set on the surface of the ground was covered with a thick layer of yellow sand, and if it weren't for the drawings that were discovered by chance, Nan Qiyun and the others would not have discovered this place at all. He tried to turn the automatic door on and off.

Surprisingly, the door slowly opened.

The automatic door slowly lifted upwards, revealing a bottomless staircase in front of everyone's eyes.

The automatic light source equipment reflects the way forward. Nan Qiyun silently counted the layers of the stairs in his heart.

Time passed for a long time, and when the count reached the "2000", a large open space was reflected in front of Nan Qiyun's eyes. It looks like we're at the end of the road.

Suddenly, the light appeared in front of them, and Nan Qiyun and the others were so stimulated that they couldn't open their eyes. It took a long time for them to get used to it. The moment you open your eyes. Nan Qiyun's body trembled involuntarily, and beads of sweat dripped down his forehead.

They were standing on a huge platform about a few hundred meters high, and below the stage was an endless empty underground plain, the wide coverage of the light, and the vastness of the underground plain space made people feel extremely abnormal.

The giant drawing model that Nan Qiyun and the others found in the command center of the headquarters became a reality. On the plain, huge starry sky warships were displayed among them, Nan Qiyun couldn't count the number of battleships, and the battleships were lined up in the distance, looking into the distance, and the black figure could still be seen.

This level is no longer simply shaking the entire world, but is enough to destroy the world more than a hundred times. These massive warships were apparently built in batches in a premeditated manner, and the organization of the forces associated with them is unknown. What is certain is that once these ships are alive and operational, the coalition government will have no power to resist.

The seriousness of the situation is already related to the survival of the edifice and the survival of mankind.

Nan Qiyun hurriedly turned on the communication device on his wrist. He needed to report this situation to Qi Yue in a timely manner.

The communication device did not respond.

"There's a magnetic field around it, and the signals here are all blocked." Number 1 spoke silently. Only she was still expressionless, and Nan Qiyun couldn't see a trace of panic on her face.

Nan Qiyun suddenly felt the vibration of the space, at first it was faint, but gradually the vibration became extremely violent. Large chunks of sand and gravel began to fall downwards from above.

"Let's go!" He yelled. The state of the entire underground space has become extremely unstable. They turned and ran up the stairs.

The long steps stretched all the way up, and there was a rumbling sound behind him, and Nan Qiyun couldn't help but turn around. The piles of stones behind them poured down in a dense manner, and the steps collapsed downward in layers under the violent vibration, and the speed became faster and faster.

In the long process of escaping, it seems that it has been tormented for centuries.

When a glimmer of light came from the front, Nan Qiyun and the others were amnesty. The four of them rushed out of the exit of the underground staircase.

Nan Qiyun hurriedly turned on the communication device and sent his coordinates and distress signal to the F-layer military.

"Get out of here as soon as possible, the foundation here is extremely unstable and there is a possibility that it will continue to collapse at any time." No. 1 reminded Nan Qiyun. Her physical strength was greatly depleted, and her bangs were already soaked with sweat.

"Can you move?" Nan Qiyun suddenly asked.

Number 1 looked up, surprised for the first time, and then slowly regained his composure. "Out of the way." She said.

The four of them quickly moved to a sand dune about 1 kilometer outside headquarters. In the distance, the sound of propellers rolling air could be heard. Nan Qiyun fired a flare into the sky. The helicopter took off with four people in tow, and there was another loud bang in the ground below. A huge crack opened on the vast desert surface, and the sand layer continued to fall downward. The entire headquarters of "20-00" sank into the yellow sand in a violent tremor.

Qi Yue sent a message to Southern Qi Yun.

Nan Qiyun turned on the communicator. There is only one sentence on it.

"Urgent recall."

Ahead, there is a desert plain that connects to the sky.