Huogu pondered for a while, and could not find any clues about this super-giant underground cavity in the information collected.

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

　　 At present, Huogu can find something that has a certain value, that is, the book of formations 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 formations, and can only sigh with excitement.

　　 In the following period of time, the rhizome system has passed through twelve pairs of supporting pillars and thirty-two pillars of seawater formed by the cracking of the bottom layer, and finally the entire ground of the underground cavity is completely covered.

　　 "It's finally over."

The command of the rhizome system has caused Huogu to spend a lot of energy. You must know that the area occupied by this underground cavity has reached the concept of '100 million'. The fact is that every place and every section of the rhizome system is monitored. Part of it, but quite consumes Huogu's energy.

　　 Freed from mental work, Huogu moved his gaze upward.

　　 "On the top floor..."

　　 "...Forget it, the rhizome system also has its own weight. If you occupy the top layer, it may break the stress balance of the top layer, and the consequences are quite serious."

　　Once the breach at the top level is too large, it may even trigger a chain reaction, and the entire top level will collapse. After all, it is an old antique that has been around for 800 million years.

　　 In other words, the exploration of the cavities in the ground is over?

No, Huogu turned to continue to explore downwards and backwards. Since the left and right sides, the top floor and the front are all metal walls, the boundaries in other directions are probably also metal walls. In other words, this underground cavity is quite a large part of the space. In fact, they are all buried by rock formations.

　　 This is most likely the result of damage to multiple parts of this cavity in the early days, resulting in lava infiltration.

　　 As far as it is concerned, neither the builder of this place nor this building belong to this planet.

　　 The early molten planets also had oceans, but they were lava seas with an average temperature of over 1500 degrees Celsius and various extreme environments.

　　 In addition, the early stage of the planet is not only the early stage of its individual, but also the early stage of the planetary system. There are tens of millions of wandering meteorites floating in the planetary system. Therefore, there will be a space traffic accident in which meteorites fall into the planet every three to five.

To put it intuitively, it is the situation where a Tsar nuclear bomb is detonated somewhere on the earth every few days. In addition, because lava is a fluid, shock waves can easily spread to the world. The difference is only the strong and the weak. It's just two concepts.

　　 If **** really exists in this world, it's probably like this.

Step back ten thousand steps, even if there are intelligent creatures living in the lava sea, and they are civilizations that have developed to a certain stage, they do not need to build this kind of building. According to the traces found in the current cavity, the building was originally empty. , Lava only existed in this building after the building was damaged.

　　 May I ask, a civilization born in the lava sea needs to build such a building completely different from their living environment?

　　 If it is to carry out large-scale scientific experiments, but judging from the size and quality of the void, this kind of speculation is completely unconvincing.

　　 The rhizome system followed the instructions and explored downwards. The solid volcanic rock was easily squeezed away by the rhizome like tofu, and something was quickly discovered.

　　 However, Huo Gu was not happy with what he found. The thing he found was a metal plate, which was the same as the first discovered metal plate.

　　 A little disappointed, Huo Gu continued to order the rhizome to explore below, it firmly believed that it would find something.

　　 Huogu’s firm belief is not without reason. The rock formations can often keep things intact for a long time, such as those dinosaur fossils.

In such a huge space as this man-made cavity, it is absolutely impossible to live with only one intelligent life body. If the original fragmentation was a sudden accident, it is extremely likely that there are bone fossils of those builders under the ground of the hollow underground. .

　　 After that, after another period of time, the boundary of the cavity reached by the rhizome system is not a rhizome that is explored downward, but a rhizome that is explored backward.

　　Because of the rock layer as its support, Huogu didn't need to worry about collapsing, the rhizomes spread wildly to cover the positive area behind, including the top layer behind, so he found several breaches in the metal wall behind.

　　 Huogu’s previous speculation of “holes poured into lava” was confirmed by this, which made it more vigorous and more careful to search every corner of the underground rock formations.

　　The effort paid off, and its efforts were not in vain. The fossils that had been sleeping in the rock for 800 million years were discovered by rhizomes that unscrupulously expanded, and once they were discovered, there were still a large area.

　　 After injecting connexin to stabilize the material structure of the fossil, Huogu focused his attention on manipulating the rhizome to separate the rock strata above the bone, and carefully lifted a bone sample upward.

　　 When the skeletal fossils were lifted out of the rock formations, Huogu finally had the privilege of seeing the alien skeletal fossils with his own eyes.

The color of this skeleton is different from that of humans and the fossils of alien skeletons discovered by humans on Mars. The whole body is reddish brown. The main component composed of iron oxide, Huo Gu inferred, these wisdoms Living creatures use iron as bones to support the body, not calcium. After 800 million years, the iron element in the skeleton gradually combined with oxygen, and it became the skeleton made of iron oxide.

　　 Maybe because of the sudden arrival of lava, this skeleton is relatively well preserved, except for some cracks, basically there is not much damage.

The skull has a pair of goat-like horns. Behind it is a pair of bone wings similar to a bat. The spine is about three meters tall. The spine bones are very similar to the human spine, but there are differences. The lower end of the spine bones continues to extend out to form a spine. Spine tail.

　　 is the same limbs, an opponent and a pair of feet, there are six finger bones, and the same is true of toe bones.

　　 The inside of the skeleton is a hollow structure, which is similar to the skeleton of a bird. In other words, the wings on the back of these intelligent creatures do have the function of flying.

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

　　 "Fortunately, it is not an excavation activity of an international organization, otherwise some terrorists may jump out and blow up this skeleton and this cavity."

At the beginning, at the International Space Center, the interference of religion was quite a big deal. There is no way to prove that aliens exist, which means that humans are also born in nature. Who still believes in their set of'God created man' ?

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

　　 "Why did you descend to die when the planet was still in a molten state?"

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

　　 Amidst thousands of thoughts, Huo Gu's mind immediately flashed the guy who had pushed himself from the bottom of the sea into the ground, the body of which was unknown.