Fang Yu shook his head, always thinking that this guy regarded this trip as a strange adventure. Although it was indeed an adventure, the real adventure was not as romantic and exciting as people imagined - on the contrary, the excitement was exciting enough, but sometimes it was full of frightening. Especially when you want to deal with the Imperial Army this time, if you don’t pay attention, their actions in the Empire will fail.

But he had a reason to come here. Zero crystal is too important to him, and it can even be said to be the foundation of his foothold in this world. He is not worried that technology will spread, but he is afraid that he will not be able to analyze the true future of Zero crystal before that. Hayn left him a technical route, but how far can this technical route go--

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This adventure in the center of the earth was actually to find more technical clues. In addition to the Zero Magic furnace itself that could enhance the strength of the Seven Seas Brigade, Fang Yu also hoped to find some basic ideas from the above when alchemists developed Zero Crystals in order to inspire his inspiration. He had realized more and more that the further he went, the road to Zero Crystal was not as smooth as originally thought.

Since the successful development of γ crystal, he has overcome the difficulties in the subsequent development of Delta crystals more than once, but he still cannot touch the next technical threshold. Repeated verification from the technical documents left by Hayn, it is impossible to find out the last few most accurate material ideas, and the structure and magic array are still full of fog. This is why he urgently opened up Notts Pitts and his team.

Therefore, even if the Imperial Army was ahead, he had no reason to turn back.

Everyone walked through the dark environment, and even the most talked, the surrounding environment became quiet and quiet. Behind the stalagmites were lined up, like a silent beast, devouring all the sounds of everyone passing by, and staring at them with golden eyes. When people accidentally saw each other looking back, their eyes disappeared from behind the stone forest and disappeared without a trace.

Everything is like an illusion rooted in the darkness.

Most of the people in the Qihai Brigade have experienced underground adventures and are completely unaware of all kinds of illusions, but Shui Wuming and Xiaoyao are obviously a little nervous. Even the always calm senior Luo Wei seems a little restrained and look around from time to time. Fang Yu reminds her warmly, "That's your own footsteps, senior sister."

"Well, I know," Luo Wei nodded slightly, "but I just can't help but want to see."

"It's normal," Fang Rong replied, "I was like this when I was underground in Fenris."

It was a long-standing story, a magnificent adventure that took place in the past.

The audience was fascinated by the fact that most of the people present had either participated in it personally or had heard about the events that happened that day, including Luo Wei and Shui Wuming.

Fang Yukong used a few words to eliminate the doubts about darkness, and only the endless curiosity about this underground cave. It was obviously not done by artificially, but natural magical crafts left traces here. What did the imperialists dug out from the mining area of ​​Nordspits, and why did the alchemy of ancient times leave ruins below it?

The road broke out in the darkness, and the cave groups underground became more spectacular in front of them, and vaguely revealed the aura that an underground world once existed here. This undoubtedly confirmed everyone's conjecture, but also increased the possibility of them losing clues of the imperial soldiers in front of them.

Fortunately, Miss Nightingale lived up to expectations and found the clues left by the imperial soldiers in a forest of stalagmites.

"It seems that those people stayed here for a moment after leaving the rock trail." Alisa said to everyone with a dagger sheath.

"Did you lose all the money." The Paparals praised the Imperial Army.

"But you're about the same."

Alisa glanced at him and was about to tell the story of the silver sword from the sea of ​​trees.

The Paparals hurriedly changed the subject and asked her to stop.

But this little episode did not prevent everyone from re-grasping the movements of the people they were following before. After finding the right direction, the movement became smoother. Going past the quiet, dark stalagmites woodland, not long after, Miss Nightingale stopped in front and let out a slight "ah".

The next stop was the square pluck. The road was cut off in front, and a cliff appeared on the outer edge of the stalagmites forest. The valley bottom was originally an underground rock lake, but the underground river had dried up, revealing the rugged bottom of the lake.

In the center of the lake, which was originally a place like an island in the middle of the lake, now a hill raised on the ground is formed, connected to all sides by suspension bridges and cableways. The lights are brightly lit, and the Aoshu people built a fortress on it.

The light of the spotlights poked out from the fortress was piercing the darkness underground, sweeping past everyone's heads from time to time, but the light that rushed straight to the top of the rock revealed a deeper and more vast underground world.

Fang Yu gently took off the clumsy device on his head, and he actually didn't need it, just to set an example. And here, the lights in the Aoshu Fortress were illuminating the underground world as if it were daytime.

In the gray light, many imperial troops were heading along the fortress, passing through the gray basin, and heading in all directions. There were also imperial troops returning from all over the place, gathering along the bottom of the lake towards the peak. The vast underground space was nearly a few thousand meters wide and long. They even saw the team of imperial troops they had encountered before.

The Imperial Army were all wearing gray-black armor and battle robes like they had seen before, which were very different from others.

"This is..." Among the people, Xiaoyao, who even talked the most, stopped and looked at the scene in amazement. Even if he was nervous, he could see something was wrong here. Is this an underground mining area? This is clearly an underground city and an underground fortress.

"What are the Oshu people doing here?" Shui Wuming was also stupid, "They built a fortress here?"

"Look at that side!" Jita suddenly pointed in a direction and said.

Everyone looked in the direction she pointed, and found that there seemed to be an amazing project behind the fortress - or rather, the existence of this fortress existed for these projects, which were rows of tall iron pillars, like the iron nails used by giants, nailed into the ground one by one.

There are as many as thirty iron nails, each of which is almost as high as the outer wall of the fortress. The Aoshu used a strange device to power those iron nails. From the appearance, the square pulp could recognize that the magic furnaces had a deep connection with the tower magic furnace at a glance.

The dense coils were wrapped around the iron nails, and there were crystal arrays for energy storage arranged around them, spreading on the other side of the gray lake bottom. The scene reminded the group of people of the molten salt power plant on the earth, with the same towering columns and dense reflectors below.

"The Empire is drawing magic from the underground?" Xiaoyao seemed to understand something. "No wonder, no wonder the underground elements swarmed out, but what did the Empire need so much magic to do? Don't they know that doing so is harmful to the stability of the floating continent?"

"No." Luo Yu, who walked out from behind, shook his head when he saw this scene, "That's not a device to extract magic power."

"He was right," Shui Wuming also realized that she was not an all-round craftsman like Fang Rong and Wei Yu, but she finally had some understanding of the ship-use devices. "Those devices look more like..."

She looked at Fang Zhu and Luo Wei with some uncertainty.

Among the crowd, if anyone could recognize these devices, the only two people in her mind could be.

Fang Yu was gently placing his hand on the stalactite beside him and nodded. Although he was also shocked at the moment, it did not prevent him from making the correct judgment. "From the perspective of shape, those who do look like the prototypes of a large Guy generator. It's so strange, why did the imperialists use a backward way to supply energy to it..."

"Guy generator?" Xiaoyao stared at the things with wide eyes, "Is it the Guy generator I imagined? The main source of lift of the floating ship. What do they do to build this thing here? Experiment for future Imperial warships? Or is the Nordspits underground mine actually the secret experimental base of the Imperial Navy?"

"God, even the Gay generator is a bit too big. Those devices are even larger than the largest floating warship itself. Do the Oshu people have any secret plans? Or are they planning to raise the entire mining area to the sky?"

"Who knows," the Paparals shrugged and smacked their lips, "It would be better to say that they had done such a big project under here, and they had concealed everyone from everyone. The groundwater was exhausted and the mine foundation was sinking, making everyone go around. The first contestants were like fools, and they didn't find it."

Since there were no candidates in the first division, no one refuted his sarcastic comments.

Others did not intend to help their North American colleagues argue, but the imperialists made such a big noise under the mining area. Even if the Imperial Army blocked it, the summoners were indeed a little too silent.

The man from the Gray Dagger once opened another passage, but the collapse of the mine tunnel damaged one of the elevators now seems a bit too strange. The summoners have always been omnipresent, and the prohibition of the indigenous people seemed to be an invitation to them.

Unless there is a local summoner force involved and keeps all this secret for the Imperial people. No, the local summoner force may not be enough. Fang Yu almost immediately thought that several major guilds and even alliances in the first division would also participate.

Just like in Kaurin-Ishurien.

But what is hidden underneath?

What are the secrets of those huge devices?

Miss Nightingale was staring quietly in that direction, and as everyone was whispering, she pointed there for everyone, "But the Empire has marked the direction for us, look there."

Fang Yu then drew his mind and looked in the direction Alisa pointed. Behind the rows of towering devices, the deep rock top was like a giant bowl pressed upside down on this lake basin. The hard rocks were covered with purple quartz-like crystals, densely spread between the cracks of the rocks, like starry sky.

The closer they get to the direction of those devices, the denser the purple crystals are, and finally they grow into clusters of huge crystal forests. But they are hanging down and growing from the rocks, and the crystal surface reflects the lights of the underground world.

Between those crystals, the rocks cracked a deep gap, like a giant door, leading to the endless dark world of underground. And the fortress of the imperial people was actually guarding the exit of the giant door.

Fang Zhu looked up at the giant gate made of nature, and couldn't help but take a breath. He had imagined that there was a natural entrance to the underground world under this mining area, but he did not expect it to be of such a scale.

No wonder the Aoshus stopped the entire mining area when it was discovered. It is probably rare in the entire Aitalia, such a rift leading to the underground world, and it is hard to imagine the shock that workers felt when they discovered this place.

Those people might think that this is the door to hell, and it may not be necessary.

"The passage to the underground world!" Xiaoyao carefully distinguished for a long time before he shouted out after realizing it. He waved his fist excitedly, "We are indeed not wrong. The imperial people actually hid such a big secret below. Then the place where the ancient alchemy ruins were discovered!"

“Ancient alchemy ruins?”

"Think about it," Xiaoyao said with great analysis, "those modern techniques must have been discovered in the abyss below, which means that there must be an alchemist who has lived below. Since they have lived, they will definitely not live in the wilderness. Even if those alchemists are some monks, they must need an alchemy laboratory or something?"

"So those are the ruins of ancient alchemy?"

"You make sense," Shui Wuming said in a perfunctory tone, "but why do alchemists living in the Middle and Modern eras leave behind ancient alchemy relics?"

"Well……"

"Well..."

However, the two of them spoke nonsense, which aroused Fang Zhu's thoughts. Did the alchemists who mastered the sixth technical route live in the underground world, but what happened in the earthly world that made them live in seclusion here?

Why did those Hein's successors leave their technical routes here?

Just like Zero Crystal, why is it located under the underground temple of Vanna Forest?

He was exploring the puzzle behind it.

But Luo Wei, who was standing beside him, asked at this moment: "How do we get into that place?"

She pointed in that direction, and the majestic fortress of the Aoshu people was stuck in front of the entrance to the underground world. Obviously, the empire was here to keep his secret and did not intend to allow outsiders to enter easily. The imperial soldiers patrolling around, wearing gray and black battle robe, were the first difficulties they had to face.
Chapter completed!