Chapter 798

On the frozen lake surface in Dongting Lake area, a group of engineers are drilling holes into the ice and burying the prepared explosives after drilling to a certain depth.

Instead of blasting the ice, they intend to use the seismic waves generated by the explosion to carry out geological exploration underground and determine the location and trend of underground caves.

This is to prepare for the tunneling attack plan formulated by Chen Xin.

Although when designing this scheme, Chen Xin made preparations for how to prevent the damage of shield machines and tunnels by those alien creatures in the underground caves, if possible, both the military and Chen Xin hope to find a excavation route that can avoid those existing underground caves.

On the one hand, it can save a lot of trouble. After all, if you can directly dig down to the nest of alien creatures without interference and then attack directly, it is really very worry-saving and labor-saving.

For the military, this is undoubtedly the most ideal state.

On the other hand, it is to minimize the construction difficulty in the excavation process.

The shield machine prepared by Chen Xin for this excavation task is at least more than 70 meters long and more than 10 meters in diameter. If the machine falls down because of digging a cavity, it will undoubtedly cause great damage to the machine.

Therefore, planning a reasonable excavation route has become an important prerequisite for the implementation of the whole plan.

While these engineers were burying explosives, another group of engineers were cooperating with the engineers in the tense construction in the original urban area.

Their task is to dig a large foundation pit here for placing the shield machine.

Although this excavation offensive does not need to dig down first and then hoist the shield machine down like the subway, it still needs to excavate a pit in advance and clear the starting position to facilitate excavation.

After all, the whole shield machine is tens of meters long and weighs amazing. The excavation is inclined downward with a certain angle. It is impossible to raise the tail of the whole shield machine to the sky.

On the construction site, Chen Xin is inspecting the progress of construction.

"The construction period is very tight. Are you confident to complete the task?" Chen Xin asked the construction director aside.

Because both the high-level and the military hope to solve the problems in the Dongting Lake area as soon as possible, they are very worried about the construction period card.

"Please rest assured that we have divided the workers into three shifts, with 24-hour rest for people and machines, so as to ensure the completion of the construction of the foundation tunnel within the specified time!" the person in charge looked very confident with his words.

In fact, the person in charge is really confident in completing the construction. On the one hand, he has sufficient manpower. The military even provided some engineers to assist the construction.

On the other hand, the construction itself is not a particularly complex and large-scale construction. It is just digging a deep pit to complete the foundation tunnel erected by the shield machine.

Although the construction requirements are very strict and the construction period is tight, it is still within the scope that can be completed. It just needs to be constructed very efficiently without any time to make mistakes and waste.

However, this is not too harsh. As long as there are no mistakes in the construction, we can basically ensure the smooth completion of this task.

Chen Xin nodded with satisfaction. Since the person in charge was so confident, he naturally wouldn't say much.

At the same time of construction, a huge shield machine is being assembled on the side of the construction site.

This is the shield machine required for this mission obtained by Chen Xin after upgrading the system with a finished shield machine ordered from the factory.

He spent almost a week trying again and again before, and finally got the machine that can dig 50 meters a day.

Chen Xin used the concepts and ideas of some sci-fi films he had seen a long time ago for reference, and further improved the cutter head of the original shield machine.

In addition to improving the material and structural efficiency of the cutter head, Chen Xin also installed a directional acoustic transmitter on the cutter head.

This is somewhat similar to the sonic gun. The transmitter will emit ultra-high frequency sound waves in the direction of excavation, so as to loosen the soil and break the rock and improve the excavation efficiency.

In fact, 50 meters a day is not the limit of this machine. According to Chen Xin's design and simulation results, this machine can dig more than 100 meters a day at most if it is driven with maximum power, but then the subsequent tunnel construction can't keep up.

Therefore, after careful calculation and evaluation, Chen Xin controlled the excavation speed at the most appropriate speed of 50 meters a day.

This can not only ensure the construction of each section of excavation, but also ensure the excavation speed, and will not delay too much time.

According to Chen Xin's prediction, the whole excavation project needs to dig down about 4000 to 5000 meters. Because it is inclined excavation, the distance is several times the vertical depth.

The time he prepared for the whole plan was about nine months, and the construction period was about three to four months. The remaining time reserved was for the military.

The military has no objection to this. According to their estimation, if the mother of alien creatures used to produce combat offspring can be successfully removed in the first wave of attack and their recruitment can be cut off, the military is confident to end the battle within three months.

Chen Xin is not optimistic about this. He is always worried that there are higher units for alien creatures, and it is uncertain what is hidden in the underground alien creatures more than 1000 meters deep.

The military's estimate of the end of operations in three months is only the result of the current situation.

According to Chen Xin's calculation, even if the offensive goes well, it may take the military four to five months to end the whole campaign.

If anything happens, the whole operation will last longer.

In this regard, Chen Xin has also expressed his concerns to the military, and the military has made plans and adjustments for this, but they do not intend to modify the original timetable and still intend to complete all the clearance and suppression operations within three months.

This inevitably makes Chen Xin feel a little worried about whether the military is too confident.

However, the operational plan formulated by the military is very rigorous, and all parties have left enough margin for emergencies and prepared standby plans. It really doesn't look like excess self-confidence.

Facing this situation, Chen Xin had to put down his worries and focus all his energy on the implementation of the plan.

After all, there are many things to consider and prepare for in order to dig more than 1000 meters underground in three months and launch a large-scale operation. As the proponent of the plan, Chen Xin still has a lot to do.

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