Hogu pondered for a moment, but could not find any clues about this huge underground cavern in the information he had gathered.

800 million years, the vicissitudes of life, is enough to make any brilliant object decay.

At present, Huo Gu can find something that still has a certain value, that is, the Book of Arrays that occupies a hundred square kilometers, but the problem is that it does not have the ability to interpret the contents of this huge Book of Arrays, so it can only sigh with admiration.

In the following period, the rhizome system passed through 12 pairs of support columns and 32 seawater columns formed by the cracking and falling of the bottom layer, and finally completely covered the entire ground of the underground cavity.

"I'm finally done."

The command of the rhizome system has made Huo Gu spend a lot of energy, you know, the area occupied by this underground cavity has reached the concept of '100 million', and the fact is that monitoring every ground and section of the rhizome system is quite consuming Huo Gu's energy.

Liberated from mental labor, Hogu shifted his gaze upwards.

"Words ...... the top"

“…… Forget it, the rhizome system also has its own weight, if it is entrenched in the top layer, it will break the stress balance of the top layer, and the consequences will be quite serious. ”

Once the breach at the top layer is too huge, it may even trigger a chain reaction, and the entire top layer will collapse, after all, it is already an antique that is up to 800 million years old.

That is, the exploration of the underground cavity is over?

No, Hogu turned down and backwards to continue exploring, since there are metal walls on the left and right, on the top and in front, and the boundaries in the other directions are likely to be metal walls as well, in other words, a considerable part of this underground cavity is actually buried by rock formations.

This is most likely the result of the early days when several parts of the cavity were damaged, causing lava to seep in.

As it stands, neither the builder of this place nor this building belongs to this planet.

The early molten planets, although they also had oceans, were lava seas, with average temperatures above 1,500 degrees Celsius, and various extreme environments.

In addition, the early days of the planet are not only the early days of the individual planet, but also the early days of the planetary system, and there are tens of millions of wandering meteorites floating in the planetary system, so there will be space traffic accidents where meteorites fall into the planet every once in a while.

Intuitively, it's the case of a Tsar nuclear bomb being detonated somewhere on Earth every few days, and because lava is a fluid, the shock wave can easily spread to a global scale, the difference is only in the two concepts of strength and weakness.

If there really is a hell in this world, this is probably what it looks like.

Take 10,000 steps back, even if there are really intelligent creatures living in the lava sea, and they are civilizations that have developed to a certain stage, there is no need for them to build this kind of structure, according to the traces found in the cavity so far, the building was originally empty, and the lava only existed in this building after the building was damaged.

Is it necessary for a civilization born in the lava sea to build such a structure that is completely different from the environment in which they live?

If it is said that it is for large-scale scientific experiments, this speculation is completely unconvincing based on the scale and quality of the hollow.

The rhizome system followed the instructions and explored downward, and the solid volcanic rock was easily squeezed open by the rhizome like tofu, and something was soon discovered.

However, Hogu was not happy about what was discovered, and the found thing was a metal plate, the same as the first metal plate found.

Disappointed, Hogu continued to order the rhizome to explore downward, confident that it would find something.

Huogu's belief is not without reason, rock formations are often relatively intact to seal some things intact for a long time, such as those dinosaur fossils.

It is absolutely impossible for a space as huge as this artificial cavity to live with only one intelligent life form, and if the original shattering was a sudden accident, then it is very likely that there are fossilized bones of those builders under the ground of the underground cavity.

After that, after some time, the rhizome system reaches the boundary of the hollow, but not the rhizome that explores downward, but the rhizome that explores backwards.

Because of the rock formations as support, Hogu didn't need to worry about collapsing, and the rhizome spread wildly to cover the rear area, including the top layer behind, so he found several holes in the metal wall behind him.

Hogu's previous speculation of 'pouring into lava' was confirmed, and it was also made to search more vigorously and more carefully in every corner of the underground rock formation.

The effort paid off, and its efforts were not in vain, as the 800-million-year-old fossils that had been dormant in the rock formations were discovered by rhizomes that had expanded unscrupulously, and once discovered, they were still a large area.

After injecting connexins to stabilize the material structure of the fossil, Hogu concentrated on the rhizome to separate the rock layer above the skeleton and carefully lifted a bone sample upward.

When the fossilized bones were lifted out of the rock formation, Hogu was finally lucky enough to see the fossilized bones of aliens in person.

The color of this skeleton is different from that of humans, as well as the alien skeleton fossils excavated by humans on Mars, the whole body is reddish-brown, and the main component is iron oxide.

Probably because of the suddenness of the lava, the skeleton was relatively well preserved, and apart from a few cracks, there was basically no major damage.

The skull has a pair of goat-like curved horns, and behind it is a pair of bony wings similar to bats, about three meters tall, and the spinal bones are similar to the human spine, but there are also differences, the lower end of the spinal bones continues to extend out, forming a spinal tail.

The same limbs, one pair and one pair of feet, six finger bones, and the same are true of the toe bones.

The inside of the skeleton is a hollow structure, similar to the skeleton of birds, which means that the wings on the back of these intelligent creatures do have the function of flying.

"How does this creature remind me of the devil defined as evil in Western mythology?"

"Fortunately, it's not an international organization's excavation now, otherwise some terrorists might jump out and blow up this skeleton and this hollow."

At the beginning, at the International Aerospace Center, the interference of religion was quite big for Hogu, and there was no way to prove that aliens exist, which means that man was also born from nature, who still believes that their 'God created man'?

"But then again, why are these intelligent beings on this planet?"

"And why did you descend and die when the planet was still in a molten state?"

The time span of 800 million years is too large, and Huo Gu has no way to show the situation at that time.

In the midst of thousands of thoughts, Huo Gu's mind immediately flashed to the guy who had thrown himself from the bottom of the sea into the ground, and his body was unknown.