In the rear of Datang Heavy Industry, a large factory has been established in the place where the relics of the 10,000-year-old civilization of prehistoric civilization have been excavated, that is, the dozen or so energy rifles.

This plant is about 200 meters long, 100 meters wide, and 20 meters high, which is relatively small among the large factories of Datang Heavy Industry, but below this plant, there is Ye Fan's earth-shattering plan.

The so-called "Nantianmen" plan is to build a large-scale floating city-to-city channel, which is to directly open a passage to connect the South China Sea, and then go all the way from the bottom of the South China Sea to the South Pacific.

The paint of this large factory is composed of white, but the ten-meter-high gate at the entrance is in a black and white striped style, which looks like a different beauty.

This factory is still in a top-secret state in Datang Technology, even the high-level of Datang Technology cannot be easily approached, and there are combat robots disguised as intelligent robots nearby.

If someone is found trespassing here, these robots will immediately expel them and let them leave here, otherwise they will be stunned and forcibly taken away.

When Ye Fan walked into the factory, the ten-meter-high gate was slowly closed, and the moment the door was closed, the eight drones canceled the optical stealth.

At this time, Ye Fan's large steel battle armor successfully appeared from the air.

Inside this plant, almost all of them are steel rolling machinery, as well as large and small molds and robotic arms, and hundreds of intelligent robots are assembling unknown materials.

In the center of the factory, there is a large hole with a radius of 50 meters, which looks bottomless, and I don't know where it leads, the edge of this big hole is made of black steel, and on the edge of the big hole, there is a light source.

At the edge of the large cave, there is also a large elevator that leads all the way to the ground, which seems to be assembled to carry some large parts into the water.

Ye Fan jumped into this big hole for life, and at the same time started the ion engine and began to slow down his body, and at the same time landed according to the altitude comparison table given to him by the origin.

The cave is a thousand meters deep, and it is only because of the use of a large plasma cannon that evaporates the rock and soil into air and plasma all the way.

Otherwise, the excavated soil can be piled up into a hill by gathering and digging alone.

Of course, some of the rock was excavated and sent to three heavy nuclear fusion reactors for fusion reaction to generate electricity.

In this half a month, in order to excavate this tunnel, the origin can be said to have built eight large plasma cannons, each of which can reach the speed of light, and can evaporate all the soil with a radius of 40 meters and a depth of 3 meters.

But in order to dig this tunnel, both nuclear reactors are turned on at full power, just to charge a large number of super batteries. Qingfeng Literature

And the eight plasma cannons at the beginning all reached the service life of the material, and it took thirteen plasma cannons to open this tunnel straight underground, you must know that this is only the first step.

The cost of each plasma cannon is very high, reaching 300 million yuan, and the cost of these thirteen large plasma guns has reached 3.9 billion.

These billions of funds, if they are above board, and bidding for powerful construction companies, will not even cost half of this point.

However, the concealment of the "Nantianmen" plan is destined to be a very money-burning project, and it can't be saved if you want to, otherwise Ye Fan would not have allocated 100 billion funds from Tenglong Chip Group to this plan.

"Smack." Relying on the reverse thrust of the ion engine, Ye Fan successfully landed underground, and when he looked up from the underground, he found that almost all that came into view was darkness, even if a large searchlight provided a light source, it could not change anything.

This is because the vertical tunnels that make up this large underground are made of liquid metal, which has a very strong ability to absorb light sources.

At the end of this vertical tunnel is an underground building made of white-painted steel, which is more than twice as long as the large factory on the ground, and several large boilers have been built here to smelt the metal.

After all, if all the steel output of Datang Heavy Industry is used to carry out the "Nantianmen" plan, it is impossible not to be discovered, so a number of large-scale boiler equipment has been built underground to smelt steel on the spot.

Underground, Origin hacked into the materials of several companies and obtained the construction drawings of a large shield machine, which was then built underground, advancing at a rate of 300 meters per day with improvements and without energy consumption and component loss.

The space beneath the ground is a square, with a large semicircular tunnel on each side, with a radius of thirty meters, but three of them are made of reinforced concrete, and no rapid prototyping of liquid metal is used.

Only one tunnel was built with liquid metal, because the speed at which the large shield machine dug the road was still quite fast, and if the shield machine could not advance when it encountered solid rock, then the head of the shield machine was removed, and then the shield machine was bombarded with electric plasma, and then the shield machine was assembled for advancement.

This tunnel leads directly to the sea, while the other three tunnels are excavated towards some local ore veins, after all, to smelt liquid metal, a large amount of ore is needed to support it.

Therefore, with the support of three underground iron ore veins, the ore demand supporting the "Nantianmen" plan can barely account for more than 40%, and 60% of the ore demand has to be imported from the outside world.

There is also a large amount of excavated soil, which is directly thrown into the sea through the sea entrance tunnel to avoid exposure to the greatest extent.

Because the tunnel is made of liquid metal, it leads directly to the bottom of the sea, so it is inclined at a 20-degree angle, and two-thirds of the way through it, there is already an influx of seawater.

"Whoosh!" Ye Fan started the ion engine, and the two-thirds of the way directly jumped directly, and finally came to the end of the tunnel, that is, the section of the road full of seawater.

Ye Fan began to walk towards the end of the tunnel step by step, the size of the steel battle armor is actually a kind of "mezzanine" mode, every time the water level dives, it will inject seawater into the steel battle armor, and then pass through the stabilization device exchanged from the system to seek the absolute balance of internal and external water pressure.