Chu Yan looked at the rock wall, and as Xia Fan said, there were many carved murals on the rock wall, depicting a group of arrogant superpowered warriors. The soldiers were wearing armor and holding weapons, surrounding the two old men with halos on their heads.

"It's Canglong and Yueyin." Xia Fan said in a deep voice.

"Are you sure?" Chu Yan was stunned and asked with a little surprise.

Xia Fan said lightly: "In the fifth volume of the Appendix to the Chronicle of the Universe, there is a detailed description of Canglong and Yueyin. According to legend, Canglong and Yueyin were the two strongest war groups before the universe entered a civilized society. Their strength was much stronger than today's superpowers."

"The reason is that they have mastered a god-level power that transcends the current combat system. Canglong and Yueyin are invincible in the universe at that time. Cangyue Universe is also named after the titles of these two major war groups."

"It's a pity that when we arrived, Canglong and Yueyin disappeared for no reason."

It turns out that Xia Fan has only entered a civilized society for a short time, but he has been able to memorize the chronicles of the universe. This crazy learning ability makes Chu Yan both envious and jealous.

As the saying goes, people are so angry that people are more popular. This is probably the case. It would be fine if Xia Fan only had top superpowers, but the key is that he is good at studying and excellent in every subject. This is really exaggerated.

Chu Yan looked at the communication terminal on her wrist and frowned and said, "There is no communication signal anymore, I can't contact the bureau, and I can't call for support."

Xia Fan nodded, "It's okay, so what about Canglong Yueyin? They are just humans exactly like us, and they don't have three heads and six arms. Follow me, don't be afraid."

Chu Yan was obviously five or six years older than Xia Fan, but at this moment, it was as if Xia Fan was the eldest brother, comforting her sister.

The road became flat, obviously this was not an accident, but the ancients once dug it with manpower, but later it was eroded by the environment, so it became beyond recognition. Back then, it should have been a very open underground passage that could accommodate three floating cars passing side by side.

The road continues downward and extends to a depth of hundreds of kilometers below sea level.

The air has not become turbid, which means that there should be some kind of ventilation facilities here. Although it is old, these facilities are still in operation.

Finally, when Chu Yan's patience was about to reach its limit, the road finally reached its end, and a gantry gate appeared in front of them.

The gantry gate is cast in thick alloy, and no one can open it by manpower alone. Five luminous stones were installed at the top of the door, three of which were lit, while the other two may have been broken and did not emit light.

There are carvings on the Broken Dragon Gate, and there are also carvings on both sides of the door, which depict Canglong and Yueyin, the two prehistoric combat groups, their forms.

"It's Crow alloy." Xia Fan smiled slightly, walked up and pushed the Dragon Breaking Gate with his hand, jokingly alleviating Chu Yan's nervousness and said, "This kind of alloy is very valuable. If we can move it back, we will get rich."

As soon as Xia Fan finished speaking, something unexpected happened to them. The gantry gate, which was tens of thousands of tons, made a squeaking sound, raised up magically, revealing a passage that continued to move forward.

"What did you do? How did you open it?" Chu Yan asked with her eyes wide open in surprise.

Xia Fan touched his head innocently, "I did nothing, I just pushed it gently, and the door opened itself."

"Automatic?" Chu Yan touched her chin.

At this time, Xia Fan suddenly smiled, grabbed Chu Yan's hand, and led her forward.

"Anyway, I've come here, go in and have a look. After all, this is probably the former base of Canglong and Yueyin."

"As sooner or later, you will be killed by your curiosity!"

Although Chu Yan was dissatisfied with her mouth, she did not resist. The two of them passed through the gantry gate.

Suddenly, Xia Fan felt a strong wind coming from behind him. He hurriedly turned around and pulled up the speed, but the dragon gate fell straight at a speed beyond his imagination.

Boom ~

Without giving Xia Fan and Chu Yan any chance, the dragon gate fell straight down and made a shocking sound.

Kakkakkakka~

Immediately, countless spotlights installed on both sides of the passage were turned on, illuminating the underground corridor!

"Look." Chu Yan grabbed Xia Fan's arm with one hand and pointed the other hand above the gantry gate.

I saw that at the top of the gate, there were five luminous crystals, but these five crystals had all been lit up at this moment.

Xia Fan smiled, "The animals told me that three suspicious people had come here before, and we were two of us, and there were exactly five people, and there were five lights on the gantry gate..."

"Don't talk about those things that are gone, the suspect came here four years ago. Even if he couldn't go out, he had already become a corpse. I'd better think about how we can go out alive. Without a communication terminal, no one would come to save us." Chu Yan said with concern.

The lights were brilliant, and the underground passage was shining brightly. After walking forward for about a kilometer, a second door appeared.

After passing the second gate, Xia Fan and Chu Yan saw a world that they would never forget for life, the underground jungle.

The fluorescent light at the top of the cave maintains the photosynthesis of the jungle. There are many streams in the jungle. When you reach in, it feels cold. It should be groundwater introduced from somewhere.

In short, in this magical underground world, an ecosystem, plants, animals, insects, and fish were built to survive here.

Chu Yan pointed to the edge of the jungle and said, "There are traces of human beings' long-term living here. They once set up bonfires and grilled fish in the river to eat. There are many fish bones piled up on the ground, and some fruit cores should come from wild fruits."

"These evidence shows that the three suspects may have been here too!" Chu Yan said her reasoning excitedly.

As soon as she finished speaking, she heard Xia Fan's voice, "No need to analyze, those three people have not only been here, but are still alive, hiding in the jungle opposite us."

Xia Fan raised his voice and shouted, "Since you have been discovered, you might as well come out!"

When time was not long, he heard the sound of branches shaking from the jungle opposite, and three savages really walked out of the woods.

The three of them had unshaven beards, red eyes, and their skin was ulcerated by mosquito bites. Their bodies were dirty, as if they had been away from civilized society for a long time.

Among the three, there was a tall and thin guy with deep eye sockets and a gray complexion. A fat old man with fair skin and looks pampered, but he had an unpleasant smell on his body. The most special person was like a golden lion, with a golden beard drooping to his chest, short and strong, with a bamboo basket on his back.

When Chu Yan saw them, she immediately tightened her muscles and clenched her fists.

But Xia Fan still looked smiling and said to the three guys of unknown origin: "What a coincidence, how come three of you are here?"

The fat and fat old man seemed to be the leader of the three. He looked at Chu Yan and Xia Fan and said, "You ask us? Who are you?"

Xia Fan was about to answer, but Chu Yan suddenly took a step forward and scolded loudly: "Stop talking nonsense! Alliance Secret Service Bureau handles the case! You all lie down! Hold your head with both hands!"

Xia Fan wanted to stop Chu Yan from showing her identity, but unfortunately it was too late. He had to shake his head gently and a bitter smile appeared on the corner of his mouth.

When the three guys heard that they were investigators of the Secret Service, they immediately changed their faces and their eyes were fierce. Among them, the guy with a golden beard secretly reached his hand to the bamboo basket behind him. Of course, all these small actions were seen by Xia Fan.

The fat and fat old man said calmly: "Secret Service? So what! You are afraid that like us, you can come in and can't get out!"

Turning his eyes to Xia Fan, the old man asked curiously: "Boy, how did you find us hiding behind the woods?"

Xia Fan smiled, "It's very simple. You don't care much about hygiene, so the taste on your body is not so wonderful. No matter how clever you hide, the smell can't be concealed."

"My colleagues have just told you that we are investigators of the Secret Service. Now you need to go back with us. There is a case that needs your assistance in investigating."

Hahaha~

The three of them looked at each other and then laughed at the same time.

The guy with a golden beard said, "Boy, you have a very sharp sense of smell, you are a little stupid!"

"You don't even know where this place is, so you'll come too? I'm afraid you won't even know how you died later!"

The fat and fat old man's eyes rolled and he reached out to stop his companions from continuing to say, he said in a deep voice: "To be honest, this is the trial ground they built by Canglong Yueyin, which swept the entire universe back then."

"As the two most famous combat groups in ancient times, it is not easy to join them. They need to pass repeated harsh assessments, and this is one of their assessment locations."

"We brothers found this place, but we never expected that this was a team trial field, with every five soldiers forming a standard combat team, which is the usual combat method of Canglong Yueyin. We only had three of us and could not meet the conditions for the trial field to start."

"But now you have come, and you have gathered up five people, and the trial ground has finally started."

"According to the rules, all five people must pass the trial alive. Otherwise, as long as one person dies, the other four people will be executed immediately. As I said, it is not easy to become a member of Canglong Yueyin. The trial field is this kind of place that requires life to fight."

"So, we can't go back to investigate with you now, because no one can go back until this trial is over."

"Whether you are the Secret Service investigators or not, the only thing you can do now is to work with us!"

Xia Fan was slightly stunned. Hearing the old man's tone, he probably wasn't lying. The five lamps on the gantry gate could also prove what he said from the side.

Just as Xia Fan's brain was spinning rapidly and thinking about countermeasures, he didn't know what was going on. Chu Yan was particularly excited today. She shouted angrily: "Want to let us cooperate with you? Impossible, absolutely impossible!"

"You are important wanted criminals in the league! Apart from being sent to the guillotine, you can't have a second end!"

"So she recognizes these three guys!" Xia Fan was shocked by Chu Yan's words.

At this moment, Xia Fan suddenly twitched his nose and his face changed slightly.

The next second, Xia Fan grabbed Chu Yan directly, clamped her under his armpits, spread her legs and ran away.

"Something is coming!"

"Speed, turn on!"
Chapter completed!