The occupation forces walked crisply and thoroughly.

When Chu Tianjiang, Iska and the others came to Odin City, the situation was out of control. Because the occupying forces had withdrawn abruptly five days earlier, some of the modulators had already lost control during those five days. Under the influence of these modulators, more and more residents are forced to transform in order to protect themselves. The problem is that civilians are ordinary concoctors, and after transforming, they simply cannot restore their original appearance on their own.

Fortunately, it is only a small percentage of civilians who have lost control.

Under Chu Tianjiang's arrangement, the resistance fighters who came with him controlled the situation. Although none of the resistance fighters were willing to target the common people, Chu Tianjiang was still forced by the situation to let Iska control the resistance fighters and kill the civilians who had turned into them.

Soon, Hawke arrived with the rest of the resistance fighters.

The occupying forces did not repair the modulation centre, although the main facilities were underground and the occupying forces did not destroy them when they were evacuated.

Chu Tianjiang did not let Iska delay, and immediately modulated the other resistance fighters.

After dark, Soya also rushed over.

She brought a very important piece of news, under the Rising Sun City, there is a huge underground base, and it was unknown before. What's more, the occupying forces of Rising Sun City destroyed the underground base and took almost all the equipment with them before withdrawing.

Apparently, the occupying forces are conducting some kind of secret research there.

Although Chu Tianjiang didn't want to leave Iska, he had to figure out the situation. The Church must have kept a secret from the construction of these cities in various parts of the northern continent after its occupation and the expulsion of its inhabitants into the cities. This secret is most likely hidden in the underground base.

Led by Soya, the two soon arrived in the Rising Sun City.

The scale of the underground base is indeed large, and it is directly below the Rising Sun City, buried at a depth of more than a kilometer, and the entrance is set up extremely secretly, in a warehouse in the modulation center. There is also a hidden exit, in the camp of the guards of the headquarters of the occupying forces. The underground base is not ventilated and uses an air handling unit that automatically restores carbon dioxide to oxygen. In addition, there are complete living and living facilities, such as a drinking water purification plant, an agricultural factory used to produce food. The underground base is large enough to accommodate millions of people and can operate without relying on the outside world.

After entering the underground base, Chu Tianjiang made an even more important discovery.

That is, the entire underground base is a dome structure, and it is not an ordinary building structure, and the load-bearing structure at the top is supported by a certain set of energy and power systems alone. This architectural design has only one benefit, which is that the top level of the underground base is an extremely open space with no shelter.

"Here, there was some kind of liquid, maybe water."

Chu Tianjiang nodded and said, "What did you think of?" ”

"Modulation tank!?" Suo Ya looked at Chu Tianjiang, her eyes looking a little puzzled.

Chu Tianjiang let out a long breath and said, "If this is a modulation tank, then what is being concocted here must be a behemoth. ”

"The question is, where has this behemoth gone?" Soya looked surprised.

It is important to know that this circular modulation trough has a diameter of at least ten kilometers and a depth of more than one kilometer. Even if the monster concocted here is not that big, it will not be that small, with a length and width of nearly twenty kilometers, and a thickness of nearly one kilometer.

What is this concept?

Compared to this behemoth, Dom was nothing at all.

The point is, if the Church concocted such a huge monster here, how did it get out of the underground base?

Thinking of Dom, Chu Tianjiang suddenly understood.

"What do you think?"

"You've seen it down there?" Chu Tianjiang didn't rush to say what he had just thought of.

Soya nodded. "The lower floor has been emptied, but judging from the layout of the pipelines, there must have been a lot of equipment used to support modulation in the past."

"And down there?"

"It's a warehouse, it's used to store supplies."

"None?"

"I didn't go any further."

"Let's go, let's go down and take a look."

After going around the underground base, Chu Tianjiang made more discoveries, and his guess became more real.

This is an underground experimental base, or modulation center, and the object of modulation is at the top, which is the huge modulation tank. What's more, there aren't many people working here, probably only a few thousand, maybe just over a thousand.

Obviously, the church built this underground base for one purpose.

It's a pity that Chu Tianjiang and the others came one step too late, the occupying army had already retreated, moved all the equipment, and the concoction product was gone.

Coming to the bottom of the base, Chu Tianjiang stopped.

"How?"

"What kind of equipment is that?" Looking at the huge equipment standing in the center, Chu Tianjiang knew that his guess was not wrong.

"What?"

"A machine used to harvest geothermal energy." Chu Tianjiang took a few steps forward. "In this device, there's a tube, and it's made of energy, that goes all the way into the mantle, and then absorbs the energy from the mantle, and transmits that energy to the modulation product."

"This ......"

"Here, that's the real key." Chu Tianjiang glanced around. "Cities are being built on top of it, and a large number of civilians are being brought in, just to cover up what is being done here. Of course, those ordinary people did not eat and drink for nothing, they were responsible for producing the materials needed for the concoction. ”

"The point is, what's the concoction?"

"Soya, how much do you know about history?"

"History?" Soya was stunned for a moment, then shook her head. "Before the arrival of the occupying forces, we had no history, our history was all ......"

"Let's talk about this when we go back."

Suddenly, the ground shook violently.

Chu Tianjiang was secretly startled, and then he understood what was happening.

Obviously, in order to absorb enough energy, the occupying forces have made a pipe into the mantle here, and a very large one. Before, there was an energy body to suppress it, and there was no problem. After the occupation forces retreated, there were no more energy bodies to absorb and suppress geothermal energy, and it was no longer possible to suppress the magma in the mantle. In other words, the magma in the mantle will soon erupt.

"What's going on?"

"Let's get out of here."

Chu Tianjiang didn't delay, and more importantly, only Rising Sun City had an underground base?

Contacting Iska through consciousness, Chu Tianjiang immediately asked her to arrange personnel to explore the underground of Odin City, and send other resistance fighters to other cities.

Although Suoya only accidentally discovered the underground base of Rising Sun City, Chu Tianjiang knew that other cities also had similar underground bases.

The magma erupted very violently, and Chu Tianjiang and Suoya were delayed for a lot of time to circumvent the underground base.

Seeing the magma rolling in from behind, Chu Tianjiang immediately summoned Bagar, then grabbed Suoya's waist and rushed straight to the ground.

In front of Bagar, the rocks that make up the earth's crust are nothing.

Rushing out of the ground, Chu Tianjiang did not stop, and rose straight into the air.

Underneath them, magma erupted under tremendous pressure, engulfing everything around them in an instant, and the surface began to collapse, turning the entire city of the Rising Sun into a sea of fire. As for the civilians in the city, there simply is not enough time for them to escape.

In just over ten minutes, 10 million people are finished!

Looking at all this, Soya grew her mouth in surprise.

In fact, without Chu Tianjiang's protection, she would have been unscathed, because she was an energy person, and those magma did not pose the slightest threat to her.

At this time, Chu Tianjiang also thought of it, and then let go of Suoya.

A few days ago, Chu Tianjiang had already taught Suo Ya how to fly by controlling the energy body. In fact, energy people can fly without the use of a gravity controller.

"Chu ......"

"It's okay, let's go back."

Suo Ya suddenly hugged Chu Tianjiang and kissed him on the face. It's just that when she was about to kiss Chu Tianjiang, she was pushed away.

"Soya ......"

"Thank you." Suo Ya smiled faintly and didn't pester Chu Tianjiang anymore.

Chu Tianjiang nodded, didn't say anything, and flew straight towards Odin City.

Before he could reach Odin City, Iska sent a message through his consciousness that there was also an underground base under Odin City, and it was even larger than that of Rising Sun. In addition, at least four cities where something similar happened when Sunburst was flooded with lava. Iska has given the order to retreat, and resistance fighters such as Hawke are doing their best to organize the evacuation of civilians from Odin.

It's just that Iska is still in the city of Odin, and in the underground base.

Although Chu Tianjiang asked her to withdraw immediately, she did not agree, but asked Chu Tianjiang to hurry over, because she had made a new discovery there.

Thinking of Iska's safety, Chu Tianjiang dared to delay at all.

Iskar was right, the underground base of Odin City was much larger, and the diameter of the headspace, the modulation tank, was more than twenty kilometers. In fact, like Sunburst City, Odin City is built on an underground base, and the city itself is a cover for the underground base.

At the lowest level of the underground base, there are also geothermal installations, and there are fifteen of them!

Obviously, Chu Tianjiang's speculation was confirmed again.

It's just that the underground base in Odin City is larger, so when the occupying army retreated, they didn't have time to take all the equipment and materials, but left some behind. Although the occupying forces have vandalized the equipment, they have at least left clues that can be traced.

When Chu Tianjiang and Soya arrived, Iska was in a room similar to a control room.