As the collectors on the seabed gradually adapt to the seabed environment, the spreading speed of the rhizomes in the underground caves has returned to its previous efficiency.

　　 Huogu continued to observe the collecting work of the collectors through the rhizome system. After confirming that there would be no problems with the collectors, he focused his attention on exploring the underground cavities with confidence.

The rhizome group in the 　　 cavity soon covered half of a previously discovered underground cavity.

The void brought a lot of surprises to Huo Gu. Huo Gu found a crack in which there was continuous influx of seawater, as well as gourds and titanium snails scattered on the ground. Obviously, this gap also leads to the seabed above Channel.

　　 In this way, the channel through which Huogu gets water can be multiplied by two, and there is no need to widen the original channel.

　　 Of course, if it’s just this kind of thing, it wouldn’t be ‘surprised’ to Huo Gu, who has experienced so many things. It’s just a surprise at best. What really surprised it was something found in the void.

　　 It is a regular triangular pyramid, not large in size, about a few centimeters in size. The cone extends all the way under the rock formation. It is easy to think that this is the sharp part of the top of some object buried in the rock formation.

This thing can be found because of the roots of the rhizome system. The roots need to be fixed in position. When the roots are inserted into the rock formation, because the triangular pyramid is much harder than the surrounding rocks, the roots form a'V' in the rock formation. The'shaped shape successfully attracted Huogu's attention.

　　 Although there is no shortage of rock formations that are harder than rock formations, it is really rare to think of such a regular shape.

　　 Huo Gu didn't think much about it, he just digged into that place with a purely curiosity mentality, but he didn't expect to discover such a shocking thing.

　　 Looking at the triangular pyramid exposed from the rock formations, Huo Gu suppressed the excitement in his heart, and said his thoughts in disbelief.

　　 "Artificial product?"

　　There is no other reason, this shape is too regular, it doesn't look like a natural product at all.

　　 Huogu rubbed some molecules on the triangular pyramid with a root and analyzed its composition.

　　 "Iron?"

　　 "No, there is carbon in it, is it steel?"

　　 "That's not right, there are potassium, titanium, silver, lead..."

　　 More than twenty elements have been discovered in it one after another. However, Huogu still cannot immediately conclude that the cavity was once a gathering place of basic lava, and it is normal for a large number of various types of metal elements to exist.

　　 In order to further confirm his own ideas, Huogu commanded the rhizome and set up his old profession-archaeological excavations.

Excavation by the roots of rhizomes is far more efficient than human excavation with a small brush, and they can be accurate to the molecular scale, and the damage caused by the excavation is far less than that of a small brush. .

　　 What made Huogu a little disappointed was that the part of the regular triangular pyramid continued to go down, it became no longer so regular, although it was still angular.

　　 This means that the possibility that excavations are natural products increases.

　　 Although his enthusiasm has been severely hit, Huogu decided to dig out this excavation in its entirety. It may be due to obsessive-compulsive disorder or occupational disease.

The ability of the roots is very powerful, coupled with the operation of Huogu, a veteran of archaeology, the excavation work is progressing very smoothly. Various possible excavation accidents have been avoided by Huogu in advance, and the excavation work is coming to an end at a very fast speed. In front of Huogu.

　　 It is a metal plate, thirty meters long and eighty-two meters wide. There is a certain arc, and the shape of the edge is irregular, like paper fragments torn out by bear children.

　　The thickness of each part of the metal plate is also not uniform. The earlier measurement was 6 meters, but the results measured at other edge parts were 8 meters, 7 meters, and 5 meters. In short, the thickness is in the interval of 8 to 5 meters.

　　 At first glance, it seemed to be a naturally formed object, but Huo Gu keenly noticed a rather interesting feature of the excavated object.

Although one side of the metal plate is not straight, it is generally similar to a plain hillside, with relatively small undulations, while on the other side, there are a large number of potholes, pits of different sizes, just like the surface of the moon, and some Potholes are connected to the opposite side, and it looks like they are penetrated by something.

　　 "Could it be..."

　　 Huo Gu seemed to understand something, mixed with unbelievable horror, and muttered to himself involuntarily.

　　 "No! It's too early to draw a conclusion, let's first determine the time of existence of this metal plate."

The roots of the rhizome system penetrate the metal plate, which is very easy for them. Although the metal plate is harder than the rock, it is also made of molecules. As long as the gap between the molecules can be found, the roots can easily penetrate .

　　 A sample of the excavated material was removed by the roots, UU read www.uukanshu.com and then rolled into the rhizome system. Huogu wanted to analyze the proportion of atoms in the half-life of the metal plate to calculate how long the metal plate had been.

　　 Soon, the result came out.

　　 "800 million years..."

A number that makes Huogu feel stunned. Dinosaur fossils have only been more than 200 million years old. It now probably understands why the thickness of each part of the metal plate is inconsistent. Under such a long span, the chemical reaction in the formation is still It will corrode the metal plate and become inconsistent in thickness.

　　 However, none of this can explain the phenomenon that the metal plate is bumpy on one side, but not on the other side.

　　 Huogu once again thought of ‘artificial objects’, but without decisive evidence, it did not dare to be so arbitrary, and nature was not without the conditions for the formation of such metal plates.

　　The matter in this cavity came to an end for a while, Huogu continued to explore other cavities. During this period, nothing similar in structure to that metal plate was found.

　　 An unclear way of speaking, I don't know whether it is disappointment or something else. Using Huo Gu's mind now, maybe it is subconsciously expecting that it is a man-made object.

　　 "Next is the exploration of the big hole."

　　 "I hope I can find something."

　　 The rhizome that had been stagnating at the entrance of the big hole finally moved again, and the problem of water transportation had long been solved. Under Huogu's instructions, the rhizome spread like a broken bamboo.

　　 Entering through the rhizome's vision, Huogu once again experienced the huge empty space. If it weren't for the wall behind him, Huogu even felt that he had once again come to the surface, a surface where he could not see his fingers.

　　 "My God, how did this void form?"

　　 Huogu once again raised his curiosity about the formation of this void.