The cave is located at a depth of about 150,000 meters underground.

There is gurgling magma flowing out from the ground, like a tide, with turbulent waves and a "swishing" sound.

The stone rock wall vibrates gently, sometimes soft and sometimes shrinking.

Lu Yuan closed his eyes and distinguished carefully, feeling an unimaginable power, as if it was roaring like a drum. However, this sound cannot be heard by ordinary people. It is a kind of idealistic wave with a very low frequency.

It only beats once an hour or so.

Boom! Boom!

This time he was really shocked. This was no cave... but the heart of a living thing!

The underground tunnel they just traveled through was actually just a... blood vessel!

In other words, the rail train traveled thousands of kilometers along the blood vessels before entering the heart.

"There really is a corpse here..."

"The corpse of the ancient giant monster?" He said with heartfelt shock.

"Commander, don't be in a daze, we're here!"

Lu Yuan quickly came to his senses and suppressed the doubts in his heart. The underground people might know some information, or they were just living their lives in a daze...

This is not the place to talk, we can discuss it later when we get back to base camp.

"Dear guests, we have entered the cave, please get out of the car."

Oshima Steel saluted in front of the train door.

Lu Yuan followed everyone and got off the train.

What comes into view is a very large train station with rail tracks extending in all directions, connecting the entire "cave sky".

It can be seen that the high-speed train technology here is very advanced.

There are also various gear-shaped decorative items. It can be seen that the gear civilization has a profound influence here.

The air is a little hot, maybe 40 degrees Celsius. After all, the place below is red magma - well, it is not known whether it is magma or not.

At the edge of the "cave sky", there is a layer of very strange, jelly-like transparent substances that slowly squirm, causing the volume of the "cave sky" to slowly expand.

There are even a few "suns" hanging in the sky, as big as a fist, very bright, shining on the entire underground - they are extraordinary and strange objects called "sun stones".

Excellent level, quite rare.

As for the leaders of the 12 races in the Underground Alliance, they were already waiting patiently. The honor guard beat the wonderful musical instruments and used unique rituals to welcome the human diplomatic team.

The girls from the dark steel civilization are dancing gracefully. The females of this race are really similar to the green girls. Except for their darker skin, they are quite in line with human aesthetics.

"Hello, human friends!"

"I am the chairman of the alliance, Tie Kui. I sincerely welcome you here." The bearded creature at the head took off his hat and introduced these racial leaders one by one.

They are Dark Steel Civilization, Squint-Eyed Men, Minotaurs, Lizard Men, Snake Men, Cave Men... Well, this reminded him of some "dungeon computer games" on Earth.

These bull-headed and horse-faced humans stared at humans one by one, baring their teeth and saying hello.

"Hello friends, everyone."

"I am the great leader of human civilization, Lu Yuan."

Lu Yuan bowed slightly: "Since the patient is dying, every second is worth cherishing... So there is no need to make the reception ceremony too troublesome. Just take us to the patient directly."

"If it is cured, it will not be too late for us to celebrate."

"If it can't be cured, don't blame me."

What he said made sense. The Underground Alliance hesitated for a moment and agreed with Lu Yuan's suggestion.

So the train started again, carrying everyone and eight mecha puppets to the center of the cave.

Here, there is a large park, about the size of 10 playgrounds.

The altar in the center is made of white jade, with countless gears forming a complex whole. The overall structure is powerful and majestic, and the gears are densely spaced, creating a complex and exquisite artistic charm.

Of course, this is not the most important thing.

Under the altar, there is a smaller "cave"!

The ancient insects hide in this small cave.

"The proportion of time in the small cave is one percent of that in the outside world. It has been hiding in it and has been suffering for a long time." Chairman Tie Kui sighed.

"How was it injured?" Lu Yuan asked.

"Maybe... it was a disaster in the last era. It was already injured before we met it. As for what happened, it has been unwilling to say."

This is in line with people's reasoning.

"I'll wake it up right now...but every time it wakes up, it has to consume part of its life energy. I'm worried..."

The Underground Alliance always has to prepare for the worst. They are willing to pay the medical bills, but the patient's family members are always reluctant to see the patient die on the operating table.

"Mr. Tiekui, even if it can't be cured, we can still do it by feeding it some life energy." Lu Yuan patted the "Devil of Greed" beside him, "It's easy to keep it alive for a while."

"The name of this robot is 'Greed Demon'. The treatment robot I specially developed is close to the immortal level."

"As long as you continue to provide aura, even if only one head is left and all other organs are destroyed, it can continue your life until the aura is completely consumed."

Suddenly, an emerald green vine stretched out, accompanied by rich vitality.

Under the light, a faint rainbow even formed.

Tie Kui, Oshima Gang and the group of people behind them looked at the ordinary-looking wooden man, and they were all surprised and doubtful. Sure enough, a person cannot be judged by his appearance.

Almost immortal!

And it’s called the “Devil of Greed”!

What is this concept?

You know, in an idealistic world, names cannot be chosen randomly.

If the name and function do not match, it will affect the effect of the item to a certain extent!

The Demon God of Greed...how greedy is he?!

I don’t know if the medical expenses they have prepared are enough?

Moreover, the name Demon God... sounds quite loud...

"We naturally believe in your technology... Haha, you can create a legend with low-quality insect shells... This one you carefully crafted is even more powerful." Chairman Tie Kui rubbed his hands.

He said a few polite words, "As for the medical expenses, we plan to sell this legendary piece of equipment."

"Whether it works or not, it's the only one we can sell."

The subtext of this sentence is: This is the only medical expense, and I really can’t afford more.

Lu Yuan also understood the other party's difficulty. He turned around and saw a dark golden axe.

Well, Master Craftsman Furnace Wheel seems to only be able to make axes.

The quality of this legendary weapon is similar to that of the "Earth-Shattering Ax". It has about 2300 aura, which is considered to be a slightly lower mid-level among the legendary ones.

But this time, Luan Lun and a dozen other craftsmen did not return to the underground.

Communication between craftsmen requires a lot of time, and just half a year is obviously not enough. Moreover, the social atmosphere in Green City is quite good, and these craftsmen are quite reluctant to think about their studies. Therefore, once the Underground Alliance put together the plan, they simply let them continue their training for a while and learn more.

Things, don't just make axes all day long. It's useless to actually fight.

"Brother Lu, if you like this ax, just take it! Just do your best. Even if you die, we will not commit medical blackmail. We believe in our credibility... Anyway, I, the Tauren, will not go to war with humans."

shouted from the side.

Tie Kui's body couldn't help but tremble, and he subconsciously wanted to scold the cow.

Then he reacted and held his breath tightly: "Damn it, if I had known, I would have put a note on the tauren."

Lu Yuan, on the other hand, was bragging to Lao Niu: "Chief Niu, we are under a lot of pressure when you say this... We humans are peace-loving and trustworthy. When did we say we would start a war?"

"Don't be scared to death when you see the ancient insects later! Our alliance is really not weak!" the tauren said with great pride.

"Okay, okay, then we are looking forward to it..."

Several soldiers stepped onto the altar and operated a bunch of gears.

Immediately afterwards, countless gears rotated, a "rumbling" sound sounded, and the entire ground began to shake slightly.

After a few minutes, part of the ground collapsed, revealing a large crater.

A smell of decay came towards them, and all the underground people felt a thump in their hearts. The smell was stronger than before, which meant that the ancient insect was not in good condition. Even the cow who had been talking nonsense was stunned.

"Everyone, step back, we are going to pull the ancient insect out."

The sound of "rumbling" became louder and louder, and a huge creature with black body and faint light was lifted up from the small cave sky.

Even if people have psychological expectations in their minds, their scalps will still go numb when they see the real thing...

What is this?

A...real small mountain!
To be continued...