Because the underground communication network has not yet been built, it is not very convenient to communicate with each other, Xu Bochen can only get the latest news through Du Ji, but what he didn't expect is that a big thing happened when he arrived.

"Collapse!" When Ji Zong Tieji saw the bad news reported below, his face turned a little pale.

"What's going on?" Xu Bochen, who was in charge of coordination, came over and asked.

Yoshizong Tetsuki explained, "Engineer Xu, you're here. Here's what happened, just now there was a massive collapse under our feet, a kind of geological reconstruction that stretches for several kilometers, so there is no way to protect and rescue, we have lost more than 10 mining vehicles, and we have lost 5 migrants. ”

Because the main material that makes up Ganymede is 50% ice and 50% silicate, it is not small in size, not very dense, and there is not much gravity.

Of course, the research department considered this problem in advance, and they provided a number of solutions to ensure the safety of the construction, the first of which was undoubtedly the scanning of the deep geological exploration equipment, and then the practice of avoiding large-scale hollowing out of the underground space, relying more on the original geological structure of Europa to ensure stability, but it seems that even if these measures exist, they still cannot prevent the accident from happening.

"I'm sorry, is there anything I can do to help?"

Yoshizong Tetsuki thought for a moment, "The scale of the collapse is relatively large, and it has exceeded my previous expectations, so I ask the research department to immediately send personnel to assist in solving the problem, otherwise according to the current momentum, it is likely to affect the progress below." ”

"No problem... I know the situation. Xu Bochen agreed to come down, you know, if you encounter a technical problem that you can't solve, it's normal to ask the research department for help, and if the research department can't solve it, it means that you have to turn to the board of directors for support.

He sent the report and photos of the scene to the research department, and after a while, the research department sent an employee to follow Xu Bochen back underground.

The employee first asked, "In order not to delay the construction progress, have you thought about finding another channel to dig down?" Look here! The employee pointed to a location on the map, "The stable belt, 15 kilometers from our feet, has a thick and intact silicate belt, why not try it out to make sure the development progress is a priority." ”

The research department gave a temporary solution, and it still didn't solve the problem perfectly, and the detour would bring more overhead, and in addition, no one knew if the detour could really avoid the unstable geological structure underground, but seeing that the other party insisted, Yoshimune Tetsuki did not refuse and let people carry it out.

Because of this incident, the engineering brigade led by Yoshimune Tetsuki had to dig a new horizontal underground passage, which was delayed for about 3 days, and then carried out a second downward excavation 15 kilometers away from the original location.

Fortunately, the joint production workshop temporarily placed in the No. 01 resettlement area has been put into production in recent days, and more mining vehicles, engineering vehicles, and transport vehicles have been continuously sent over, so that their ability to transform the terrain has been greatly enhanced.

"Collapsed again!" Xu Bochen looked at the new report and found that Jupiter's development was really not as easy as they imagined, even if they were preparing in advance for many technical problems that might be encountered, they still encountered a large number of problems that had not been considered, and they had to be solved temporarily.

He once again found the place where Yoshimune Tetsuki's engineering brigade worked, and the excavation work was temporarily suspended, and the immigrants sat idly on the ground, whispering, and an atmosphere of fear permeated the surroundings.

"It must be reinforced!" Ji Zong Tieki refused to accept other compromise methods this time, he was responsible for his own immigrants, let them die in vain, sorry, he couldn't do it.

"I agree." Xu Bochen, who was in charge of coordination, believed that the collapse could not happen again and again, so from a safety point of view, it was necessary to respect the meaning of Jizong Tieji.

"That's... Just reinforce it! The staff of the research department standing opposite actually wanted him to dig 10 kilometers away, and when he saw that the two of them were so tough, he reluctantly agreed.

Xu Bochen asked: "I remember that the research department proposed a backup plan for over-burning glass, can it be used here?" ”

"Hmm... OK! The employee hesitated to present the plan, and he did so because the idea of burning glass was not yet mature, so he was patient and could use it to create new problems.

Burning glass is often mentioned in science fiction novels when the planet develops and builds cities, because in the universe, the distribution of silicon is very large, silicon has as many as dozens of compounds, generally has the advantages of high temperature resistance, hardness, and beauty, so it is very suitable as a basic material to protect the periphery of the city.

Relying on their almost unlimited energy supply, they have a way to slowly re-strengthen the surrounding underground space, wrapping a layer of glass shell with a thickness of tens of meters, and even, choosing not the most common brittle silica glass, but another kind of metallic glass, even if it is subjected to uneven force and pulling force, the solid shell made of metallic glass can continue to protect their city.

After arguing and clapping, also because it would affect the progress of the development, Yoshimune Tetsuki's request was passed, a fusion power station was quickly put into operation, and then enough helium-3 was transported, 1 kilometer away, to become the construction site for their glass-burning.

I only saw this area, every day there will be thousands of square meters of peripheral areas are transformed into glass shells, and because of this shell, the engineering brigade of Jizong Tieji can finally dig along the direction of the center of the earth, plus the addition of 500 immigrants, resulting in a total of 1,000 immigrants here, there are more than 1,000 construction vehicles of various colors running day and night, greatly increasing the excavation efficiency.

20 km underground, 25 km underground, 30 km underground... When the earth reaches this depth, it will be like going to hell, full of magma, unstable fluids, because the crust is too thin, but on Ganymede, the depth of 30 kilometers is still far from its mantle structure, so the excavation is going well.

Another small thing that happened was because of their large-scale glass-burning behavior, so that the water hidden in the rock formations was affected by temperature changes and flowed out, so that they no longer had to worry about the lack of water, and even, the rear migrants used these water resources to build an artificial river in the No. 01 resettlement area, with a water recycling treatment plant, so that everyone can enjoy a large quota of water resources every day and experience a luxurious life completely different from the moon.

In September 2030, Yoshimune Tetsuki's engineering team successfully dug through this rock formation at a depth of 50 kilometers, and in the future, it will be displayed to everyone as the underground world of the main urban area of Paradise City. Before the engineering brigade could catch its breath, a vigorous horizontal excavation project was rolled out, in order to accommodate a series of urban functional areas including No. 02 immigration area, No. 01 industrial area, No. 01 education area, and No. 01 business area... They had to dig out a 10-square-kilometre underground space at this depth.