With the current strength of the Land Security Bureau, it won't take long to build an advance base, especially since there is a group of infrastructure madmen on the scene, Er Yi and his Consciousness Split.

A [Advanced City-Building Technique] that fused [Solidified Rock Mass] and [Steel Rock Technique] was released, and a one-piece rock fortress rose directly from the ground, and everyone else only needed to move in.

After solving the problem of a safe base, a large number of exploration teams were dispatched to explore every corner of the underground world like a net.

The exploration of various plants, animals, and minerals was continuously fed back by the members of the exploration team, confirming that this underground world is a prehistoric space that has been isolated from the outside world since I don't know how many years ago.

The relatively confined environment protected those prehistoric creatures from the drastic changes in the outside world, and they were able to thrive and survive here.

The abandoned human settlements have also been confirmed to be the people of the Third Reich who were evacuated here during World War II in the last century.

However, not many human bones have been found in the ruins that have been destroyed, and it does not look like there is any threat of extinction, but rather the ruins left behind by the threat of some hostile force, constantly abandoning the settlement and retreating the defensive line.

But what kind of hostile forces could threaten the people of the Third Reich, armed with modern technology and thermal weapons, and force them to abandon the settlements they had built for a long time and flee here? Dinosaurs?

With the further improvement of the exploration progress, they have entered the position of more than ten kilometers deep in this underground world, and the detection area is even more incalculable.

Because those huge underground cavities are like a series of endless bubbles, distributed layer upon layer in the depths of this southern region, and in some places even like high-rise buildings, there are dozens or hundreds of layers of space from top to bottom.

And that's just the caverns that have a huge interior space, and the tiny tunnels and caverns don't count.

Even these "tiny" tunnels and caverns could fully accommodate the largest dinosaurs to move and live freely in them.

In the underground world, of course, there is not only a single species of dinosaurs, this place is like a treasure trove of ancient creatures, almost all the creatures that have left footprints in history, can find similar groups here.

And it's not as dark as you might think, with lots of glowing mosses, glowing fungi, glowing plants and even glowing ores.

The luminous luminaries of different colors illuminate the underground space like a dream, and although the brightness is far less bright than that of the outside world, it can also ensure a fairly clear vision.

In addition, the environment in the underground world is much more complex than imagined.

It's not just thick mosses and algae that grow, there are many places where tall ferns and even large woody plants grow in huge forests.

The abundance of massive plants has filled the underground world with oxygen suitable for living organisms, and its concentration is even ten percent higher than that of the outside world, so it is no wonder that those huge dinosaurs were able to survive here.

The exploration team even found a very rich mineral deposit in the underground space, which made many of them think carefully.

Although they are now members of the Land Protection Bureau, after all, they still have their own belongings, and they naturally want to pull the treasure of Antarctica, a terra nullius, into their own pockets.

Eryi doesn't care about this, not to mention whether the forces behind them have the ability to mine the underground mineral deposits in Antarctica, even if they have, they have to take into account the competition of other forces, and at the same time, they have to take into account the opinions of the Ground Protection Bureau.

After the exploration team sorted out the remains of the human settlement that had been discovered, they finally found some useful clues, and they unearthed a batch of human-like but non-human creature bones from the remains of the human settlement!

These creatures, which vary in size and size, also have humanoid characteristics such as slender limbs and upright walking.

However, regardless of size, the bones are extremely thick and tall, with a wide, long head, a protruding face, and extremely sharp fangs.

Some of the heads or spine have horns, bone plates, and bone spurs, and some have thick tails, which look like some kind of reptilian evolved humanoids.

This discovery surprised everyone, because there was indeed such a hypothesis in the biological world, if the dinosaurs had not become extinct, it was indeed possible to evolve into "dinosaurs"!

And in the underground world of Antarctica, isn't there a large number of dinosaurs that have not gone extinct?

Could it be that the people of the Third Reich, who fled to the underground world of Antarctica, were attacked by these "terrorists", so they had to abandon the settlements they had built and continue to evacuate?

So why has not a single living person been found so far, and not many bones have been found? Caught and eaten by the terrorists, even the bones have been swallowed?

As the area touched by the exploration team became deeper and deeper, the high temperature, high pressure, and toxic gas environment underground began to be unsuitable for human survival.

The exploration team had to give up exploring the depths for the time being and turn to the surrounding areas, but as the scope of exploration expanded, everyone became more and more surprised.

Because these underground caverns are simply vast and endless, whenever they feel that they may have explored the end of a certain route, they can always pass through an underground river or a deep underground cavern to another underground world.

At this time, the scope of exploration has even exceeded the scope of Antarctica, how big is this special underground world?

It's not like science fiction says, the whole earth is hollow, right?

But before they could study and understand the secrets of the underground world, they had to retreat to the ground first, because they didn't need to find the secrets of the underground world, and they had already come out!

Just like the clues they found in the underworld.

The attack on the surface world is a group of humanoids with reptile characteristics, let's call them "horrors".

These terrorists did not appear on a small scale from a certain place, but emerged from all corners of the world at the same time and on a large scale, launching simultaneous attacks on all countries in the world, and even the Huang Kingdom could not avoid it!

What's even more frightening is that these terrifying people are not the primitive people they imagined, and they are still in a very primitive stage.

Instead, he wears a variety of protective armor, holds a very powerful energy weapon in his hand, and drives a variety of advanced mechanical vehicles!

As a result, the war between the surface civilization and the underground civilization began, caught off guard by human beings!