Underground, an extremely colossal subterranean project, after ten days, is finally completed.

However, this is just the completion of one underground project; the vast corresponding underground tunnel construction is still not finished.

Building tens of thousands of kilometers of tunnels is no easy task.

To construct this subterranean project, several super-large gold mines nearby have been directly mined out by Zhou Yingting, and now they have moved to more distant places to continue mining.

Fortunately, in more distant positions, there are still quite a few super-large gold mines. Apart from the increasing distance of mining, there's no other major concern.

Underground tunnel construction must not stop; once local resources are exhausted, with the underground tunnel, he can move to further places to mine resources.

If it were on the surface, continuous back-and-forth resource extractive vehicles would press wheel tracks into the ground, eventually exposing his base location.

With the underground tunnels, resource extraction elsewhere becomes much simpler and safer.

However, next, there is a need to increase construction speed.

In Seventh-level Technology, Zhou Yingting saw equipment related to underground tunnel construction.

This equipment is called the Underground Beehive, which is much more powerful than the Wind Blade Machine, which can only dig about a thousand meters a day.

As for the Underground Beehive, its digging speed is extremely fast, excavating a tunnel millions of kilometers long in about three months.

However, this is one Underground Beehive's speed. If there were more Underground Beehives, progress could be shortened further.

So, Zhou Yingting next only needs to mass-produce Underground Beehives, and he can bore through several, even hundreds of millions of kilometers of Underground Beehives in a short time.

The essence of this Underground Beehive is Nanomites, but they are far superior to Nanomites.

Construction costs reach one hundred million units of gold.

This thing seems intended for underground excavation worker use, but if used on the battlefield, it would be incredible.

The dispersed Nanomites of the Underground Beehive are completely invisible to the naked eye.

Even Tier Three or Tier Four bodies, when faced with these Nanomites, will have their skin pierced directly by these Nanomites, then enter the organs, cut them apart, and die immediately.

If on the battlefield, the Nanomites can easily slice through the bodies of airplanes, tanks, soldiers, etc.

Nanomites have extremely sharp blades that can cut through anything below Seventh-Level Civilization, and detecting these Nanomites is extremely difficult.

So don't think this is just for digging tunnels; it could be used as a war machine.

Once these Nanomites are released, lower civilizations wouldn't even know what hit them and would perish at their leisure.

This thing has a great many advantages, but the only downside is that it's extremely expensive.

The cost of one is up to one hundred million units of gold.

Additionally, it has a lifespan determined by the environment in which it is used.

If constantly used for cutting and destroying extremely hard metals, the Nanomites' blades will also dull and eventually become non-functional.

If generally used for excavating soil or stones, its lifespan is about five hundred thousand kilometers.

Which means, after digging five hundred thousand kilometers, it will roughly wear out.

And if it encounters metal ores or extremely hard stones along the way, its lifespan might not even reach five hundred thousand kilometers.

Yet, even calculating it at five hundred thousand kilometers, Zhou Yingting wants to dig out a hundred such tunnels.

A simple calculation shows it would require more than twenty billion units of gold.

Over twenty billion units of gold to complete such a massive underground tunnel plan.

When Zhou Yingting finished calculating this, even he was a bit shocked.

With these twenty billion units of gold, Zhou Yingting estimated he could raise several technologies to Level 8-9.

However, upon further thought, reaching Level 8-9 would require a significant amount of time.

If any unexpected events occur during this process and expose his coordinates, it would be the end.

Still, the underground tunnels must be built no matter what.

As Zhou Yingting illuminated the tech tree, he began constructing various large factories underground.

All these large factories are upgraded ones, basically reaching Level 5 standards.

After upgrading these basic factories to Level 5, the electricity on his side started to become insufficient again.

Fortunately, at this time, the controlled nuclear fusion power plant technology was also unlocked, allowing Zhou Yingting to construct controlled nuclear fusion power plants underground next.

The gold in Zhou Yingting's hands began to be consumed massively, and as this gold was consumed, various facilities underground started to develop gradually.

At this time, Zhou Yingting even directly moved the entire base underground.

Meanwhile, after Zhou Yingting began building the underground engineering frantically, the entire surface became incredibly bustling.

It's unclear if others have also developed, but missiles with glowing trails occasionally streak across the sky.

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