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Explosions rose and fell in the sky. Su Yun looked up in puzzlement and saw that the mechas in the sky had formed a defense line. They kept pouring fire to stop the two oval-shaped aircraft.

Great Xia’s Xuanwu Fighter and Luan Fighter were in the lead. Technological warships of various sizes followed closely behind, constantly chasing after the oval-shaped aircraft to attack.

Su Yun’s gaze quickly landed on the two high-speed flying vehicles. With just a glance, Su Yun immediately determined that they were not Earth’s technology. Even the Xuanwu Fighter and the Luan Fighter’s highest speed was only 4,523 kilometers per hour.

The highest speed of the intercontinental missile was 2.52 kilometers per hour. Even if it was an artificial flying object that had escaped Earth’s gravity, its speed was only about 30 million kilometers per hour.

However, the speed of these two aircraft was between zero kilometer to 720,000 kilometers an hour. The so-called zero kilometer was hovering. The aircraft could stop at any height at any time. It was silent and did not even have any traces.

Even though Great Xia was already the most developed country in the world, it was still unable to create flying objects of this level. Although the latest Type 97 military helicopter could also hover, it could not avoid swaying left and right. Moreover, this ability to hover was mainly built on the huge propeller.

This aircraft was different. When it suddenly stopped, all the inertia seemed to have disappeared in an instant, like an object that was growing steadily in the sky.

It was this ability that violated the conventional laws of physics. Whether it was a mecha or a battleship, they could not calculate the flying trajectory of the aircraft, let alone intercept it with firepower.

Compared to aircraft, the top technology on Earth was still too clumsy.

Su Yun frowned slightly. He looked solemnly at the aircraft that was faintly discernible in the thunderclouds and constantly losing height.

Why did an alien civilization suddenly appear on Earth?

Su Yun did not know what had happened outside while he was in seclusion. The various countries had long reached a consensus on this. The people of the various countries did not know that for this day, every country in the world had prepared for three years.

But now, the sky above Great Xia was extremely lively. Naturally, many people saw it, so it caused a heated discussion on the Internet. Even the crowd was unaware of it, let alone Su Yun, who had been in seclusion on Mount Shengu.

The battle in the sky became more and more tense. The mechas of the various countries rushed to the scene and intercepted the aircraft with Combat Wolf and the others. In fact, they had already realized the difference in strength between them.

Earth’s high-end weapons would at most cause superficial damage when they hit the aircraft. This was completely unimportant to the aircraft itself. This was a helpless reality. Earth’s understanding of alien civilization was almost blank.

The disparity in strength made the heads of the various countries anxious. From the current situation, this was only an alien civilization’s reconnaissance aircraft.

Who knew how long Earth could last if the alien civilization’s attack fleet arrived?

Zhao Guofeng, who was at the foot of the mountain, was also anxious. At this moment, he was surrounded by armed soldiers. In the distance, rows of tanks were in position. Even with such a huge formation, he still did not feel at ease for a moment.

These weapons, which were enough to threaten any country, were almost useless in the face of threats from other galactic civilizations.

All of this was also in Su Yun’s thoughts. In the past few seconds, the aircraft had easily dodged many attacks and easily left the pursuers behind as it headed straight for Mount Shengu.

Was the target of this alien civilization Mount Shengu?

Su Yun frowned. He was somewhat puzzled by this. The appearance of the aircraft could not be just a coincidence. Their goal seemed to be to find out about the current development of Earth. Could it be that to the alien civilization, the development of Earth had always been their concern?

On second thought, wasn’t the genetic evolution over the years, the excavation of the ruins of the extraterrestrial civilization, and even the mutation of Chi You in ancient times all because of the alien civilization?

It was obvious that the alien civilization was experimenting with Earth, or that they had been to Earth before. However, the feeling of being reared made Su Yun very uncomfortable. The reason why these flying machines could be discovered now was because Earth’s technology had developed at a high speed in recent years.

Who knew if aircrafts had often appeared before, but Earth’s technology at that time could not detect them at all?

Buzz…

Su Yun suddenly sensed a strange energy descend from the sky, as if it had instantly enveloped the entire Mount Shengu. Then he felt extremely offended. It was as if Mount Shengu and himself were being targeted by a pair of eyes.

Zhang Keqi’s voice came from Combat Wolf’s earpiece.

“Comrade Combat Wolf, the Technical Department has detected that the alien aircraft has released another detection wave. The detection range is the entire Mount Shengu!”

Combat Wolf was burning with anxiety. However, the difference in strength between them was too great. So what if they knew? They could not even touch the aircraft now.

“I’ll do my best!”

Combat Wolf gritted his teeth. Then, he controlled his mecha to erupt with its highest speed and chased after the aircraft.