On the ground, a new wave of space shuttles supporting the construction of the moon has taken off. Now almost 100% of all the materials needed for construction of the moon require ground support. Even in the early stages of construction, even power resources need to be transported from the ground.

At the same time, geologists on the moon have begun to enter the underground pits of the moon and are preparing to explore the situation inside the moon; especially Zhang Chen once promised Zhang Jingyuan that he would find natural large metal minerals on the moon!

The scientists carrying a large amount of supplies are like the divine turtle men carrying huge turtle shells, bloated and inconvenient to move!

Fortunately, this underground cave is quite friendly and spacious. When moving forward alone, it will basically not cause too much congestion.

Instead of rushing in, everyone kept groping around.

"It's not wrong, this is a lava cave, exactly the same as the one on the earth. The difference is that it contains a large amount of cooled metal elements. Look, this is copper, this is silver, this is lead, and zinc; according to chromatographic analysis, this is magnesium oxide, this is copper sulfate powder. Unfortunately, the moon is very dry, and if it is on the earth, beautiful malachite will form!"

"Well? Professor Zhang, didn't you say that there are metal elements on the moon? Why are there magnesium oxide?" Zhou Xu had some questions next to him.

"It's just that there are elemental substances, but not all of them are elemental substances. Geological activities are complex; especially metals such as magnesium are very active, and they can even plunder oxygen ions from other oxides. However, at the beginning of this place, so many metals have been discovered. It seems that the moon is indeed a natural treasure."

"Yes, yes," Zhou Xu responded, "I am a rough person and don't know much. But the company's leaders have been emphasizing that in the space age, steel is more precious than gold. So, I also know a little. A large amount of metal element is actually the most precious resource."

"Haha, not bad! It seems that the expert company can have the present. It is really a bit extraordinary. When others are still thinking about entering space to find gold and silver, you have already realized the importance of steel and other metals.

Let's go, continue to go deeper, there is nothing worth paying attention to and research here. Apart from the large amount of metal element and the content of metal particles, it is no different from the Earth Group. They are all cooled lava caves."

Soft fluorescent lighting tools make the surroundings appear the most natural and realistic colors. Such top fluorescent lights are extremely expensive. Only expert companies can have the ability and determination to have one! The price is as high as one million yuan, which is a truly top-notch equipment.

"Dangdang! I found a piece of gold!" Even Zhou Xu was moved. Unexpectedly, he actually won the first prize.

"Don't throw it away!" Zhang Chen observed a little, then curled his lips disdainfully. "A piece of shit gold, the legendary copper-zinc alloy!"

"Uh... I'm happy!" After cutting with a knife, it can be easily judged; there are even some places inside that are unevenly integrated, showing silvery white or purple-red. However, this thing also has collection value; it's not heavy anyway, so Zhou Xu threw it into his backpack.

The ground is not smooth, it is just a lava cave after all; and some places are even a little narrow, which is caused by uneven cooling of the lava. However, people can occasionally find beautiful stones here, such as crystals, calcite, etc.

Some people will collect specimens. After all, it is not easy to come to the moon, especially Zhang Chen and others, who are not from experts.

"Be careful, the ground ahead seems to have changed!" The personnel of the expert company walking in the front warned the person.

When I got closer, I found that it suddenly became much steeper in front, and even showed a downhill of about 30°.

"Don't worry, it's normal. After all, volcanic lava comes from the inside of the earth's crust after all, so it's normal for a downhill. Even the slope is already very smooth." Zhang Chen is a geologist after all, and was not surprised.

However, after everyone walked about a hundred meters again, the road was steeper again; but it did not change instantly, but gradually changed. The cave became increasingly empty, and some places could even see beautiful crystal clear stones, or gems; and the frequency of metal element appearance also increased a lot.

Suddenly, a team member accidentally pushed a weak stone and then rumbling down into the depths of the moon.

Rumble???

In an instant, everyone was shocked, and they didn't expect that there was air in the space inside the moon!

"Didi..." There is no air analysis instrument prepared, but it is not difficult for experts. Through spectral analysis, the proportion of atoms in the air can be directly measured.

"Sulphur atoms are 12%, oxygen atoms are 42%, carbon atoms are 7%, nitrogen atoms are 4.5%, hydrogen atoms are 11%... According to the reasonable proportion distribution, air is mainly composed of sulfur dioxide and sulfur trioxide, carbon dioxide, and nitrogen oxides; followed by water (steam), hydrogen molecules, methane, hydrogen sulfide and other gases, which are toxic to the human body.

In addition, the air density is about 0.12 kilograms per cubic meter. It is only one tenth of the earth's atmosphere."

"Okay, make a good record." Zhang Chen nodded, and then used a high-brightness flashlight to search forward. The front began to become steeper, and even a tendency to develop towards the bottomless pit.

"Prepare the rope." Zhou Xu had already directed the experts' company to start the work without waiting for Zhang Chen to speak. The high-strength carbon fiber cable is strong and light. It has a diameter of less than 7 mm, but it can lift objects weighing three tons.

The ropes are spliced ​​together, and first of all, the approximate depth below is explored.

"Boom!" A muffled sound came, and the stone tied to the front had fallen.

"Depth of 87 meters." The team members responsible for issuing ropes reported the numbers.

"Continue to detect in another direction!" Compared to Zhou Xu and others, Zhang Chen was more cautious and knew how to make the adventure safer.

88 meters, 102 meters, 79 meters, 81 meters...

A few consecutive numbers came out, giving everyone a rough understanding of the following. Zhou Xu took the risk himself, hung himself on the rope, and swayed in the air with a strong flashlight to detect the terrain below.

Zhou Xu: "Below is a typical lava cooling terrain, there are no rocks, only a smoother ground. It is just a relatively large undulation."

Zhang Chen: "Do you see clearly the colors? Different colors represent different geological conditions and different material compositions."

Zhou Xu: "I can't see clearly. Some places seem to have water-like reflections, and I don't know if it's an illusion."

"No! The inside of the moon should be very dry. It may be calcite or fragments of transparent rocks such as crystals." Zhang Chen's tone was almost certain.

"Oh, yes, it's not like water, because there is no change at all. If anyone is convenient, throw a few stones and see how the ground is. "

Bump... Several stones exploded on the ground.

"The ground is very strong and there should be no danger. I'll go down first and wait for my news!"
Chapter completed!