The dark abyss of the Nine Secluded Passages, the infinite depth of the hidden spiral.

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A hidden base built by the Abyssal Resistance to fight crystal creatures? It sounds like a very exciting place, Xinglan can't help but think of the information on the earth civilization that she has seen, there is a movie series called "Terminator", which also seems to depict the story of the establishment of a resistance army by humans after the rebellion of artificial intelligence, but the humans in it are completely in a suppressed position, and there is still a big gap between the combat effectiveness of the Tianyuan people at this time.

Xinglan had also considered many possible forms of the Tianyuan people's sub-base before, from buildings similar to those in the city to all-metal mountain secret rooms, since it had already been said that the entrance to this sub-base was in the Crystal Mountains, then it must have been built using the mountain terrain, and it would take a lot of space to accommodate the take-off and landing of so many aircraft, so maybe it was in the mountains?

However, the final result still surprised Xinglan.

The entrance to this sub-base was not concealed at all, or rather, it was not concealed at all, but a huge entrance and exit with a diameter of more than 100 meters was openly exposed in a valley in the Crystal Mountains. The entrance to this passage is completely sealed by thick metal, and there are not even any weapons next to it except for a simple induction watchtower, as if it is not afraid of the enemy to destroy this place at all, and even the movements of those aircraft entering and exiting are completely undisguised, and they are clear under the satellite.

In fact, the people of Tianyuan do not have the slightest intention of concealing it, the entrance to the base arranged in the valley is like a cover on this land, its existence is not a secret at all, and there is not even any intention to try to hide it, and those hostile crystal creatures also know the entrance to this base well, but the base still exists.

……

In some ancient legends, the first sight of heaven and earth was born before all things were created: the earth was empty and chaotic. The abyss is dark.

There is no earth, no light, only wide waters of water spreading quietly in the boundless world of darkness. However, Xinglan had never seen a similar scene, because the small pools in the Lanxing Cave were obviously impossible to call this scale, and in the outside sky, no matter how dark it was, there was always starlight flickering, and it was impossible to see this kind of ocean in the boundless darkness.

However, at this moment, when the saucer-shaped aircraft entered the open passage on the ground under the cover of several other flying machines that had completely turned into the shape of silver droplets, she finally understood why the people of the Abyss had not concealed the entrance to this sub-base at all.

She really saw what seemed to be a mythical sight, in a world of almost total darkness, where the sound of waves seemed to come from every corner of space, reverberating in an imperceptible scale, and these echoes were intertwined to form an indescribable vastness...... This is a truly dark place, where only boundless darkness can be seen above, not even any stars and moons, until a faint light slowly falls from the distant heights.

It's like the light that pierced through the initial darkness and opened the world.

Xing Lan couldn't help but sigh as she watched the Heavenly Abyss People's flying machine pass through the vertical tunnel thousands of meters deep, surrounded by a faint light, and slowly enter the space here, she didn't expect the scene inside the passage to be like this, but thinking about it carefully, it seemed to be a reasonable thing. When she first came to this starry sky, she had already discovered that Tianyuan Star also did not have a similar distribution pattern of sea and land as Lan Star, the surface ocean of this planet occupies a very insignificant area, and the real large amount of liquid water is hidden deep under the seemingly solid earth to form an invisible underground ocean...... In other words, most of the planet's continents do not float on lava like other planets, but float on these subterranean oceans that are invisible on the surface, and the mutual squeezing of each other ensures that they can support each other steadily without sinking, and of course, frequent regional earthquakes and groundwater eruptions are inevitable.

It's just that even with a general understanding of the structure of this planet, Xinglan didn't scan it carefully, so she didn't expect that just a few kilometers below this hedron mountain range was such a spectacular underground ocean...... No, judging from the breadth of this ocean, I am afraid that the scope of the area is far more than the extent of this hedron mountain, this is a water world that is truly wide enough to be called an ocean, and even the underground space formed by the hollow above this ocean is already very large. After a cursory scan of the strange rocky formations at the top of the space, Xinglan could be sure that this was not an artificially excavated space, but a real natural cavern.

How did this planet form such a huge subterranean ocean and hollows? This spectacular natural miracle surprised Xinglan, from a biological point of view, this thousands of meters thick stratum seems to be too strong to be shaken, but from the perspective of the entire planet, this is actually a very fragile balance, but this huge underground cavern is at least tens of millions of years old.

There was no visible light in the place, and even the flying saucer and the drop-shaped aircraft escorting it quickly turned off all exterior lights and seemed to have switched to other ways of viewing, and Xinglan began to observe the dark environment from an infrared perspective. It was understandable that the lights were turned off, the light they produced was so small in the vast underground ocean that it couldn't illuminate much of a range, and it was easy to reveal its own position. At this time, Xing Lan had already roughly guessed that the people of Tianyuan were not exclusive to this underground ocean, and there was definitely more than one entrance to this deep world, so they didn't need to cover up the entrance at all, and the specific location they went to after entering the entrance should be a real secret, even if the entrance was destroyed, it would be useless, and the crystal creatures should also have this kind of entrance in their hands.

However, the darkness did not affect Xinglan, and she still used the signal to observe the aircraft until they descended to a height that could almost be beaten by the waves below, and suddenly, those that had remained floating invariably canceled their flights, and one by one fell into this completely dark ocean. Although the appearance of the flying saucer does not have the ultimate beauty of the aerial saucer, but a rough style with countless parts exposed, it is actually a completely sealed structure, and it will not affect the equipment inside under the water, as for the few water droplets that have completely become streamlined, it is naturally easier to dive into the sea, just like real water droplets falling into the ocean.

It was clear that a pure magnetic field engine was not enough to perfectly propel a vehicle in the water, so Xinglan sensed that the surface of these vehicles had spread out similar devices to magnetofluid thrusters, and these aircraft were clearly designed to transform into submarines, and they were now quickly diving into this dark underground ocean like real submarines. Even with the technology of the Abyss Civilization, it would be almost impossible to find a completely stealthy vehicle in such an unarranged space, and they were the sub-bases that could silently travel to the depths of the ocean in this state.

Yes, it is almost certain by now that the so-called rebel sub-base is definitely somewhere deep in this subterranean ocean, which is as vast as the continent above, and even if it is outside the hollow above the ocean, the ocean itself still exists. If you draw a geological profile of the interior of the planet to Tianyuan Star, Xinglan will definitely add a deep water layer, the groundwater content here is too large, and if you add it all up, Xinglan feels that Tianyuan Star may even exceed the entire water content of Lanxing.

But in the end, Xinglan found that she still guessed a little wrong, that sub-base was not at the bottom of this underground ocean, because as the depth continued to increase, the water pressure in the environment began to stack to a terrifying level, she didn't know how strong the water pressure was in the deepest part of the ocean, but the water pressure that penetrated deep into the interior of the planet was obviously beyond the limit of what the Abyssal people's technology could fight...... The sub-base was not actually built on a rock bed at the bottom, but was suspended in the form of a huge abyssal fortress in the deep sea without a trace of light, and from here, the ocean was still bottomless.

The flying saucer and the surrounding teardrop-shaped craft silently approached the top-like deep-sea fortress, without any visible light or ultrasonic signal, and expertly approached a slender pipe on the side of the fortress as if it had been rehearsed countless times. It looked like some kind of decompression chamber, except that the passage was large enough to accommodate the aircraft. The water pressure here is obviously not calculated from the surface, but there is also a pressure of more than 10,000 meters deep, so the prosaic-looking deep-sea fortress is actually under tremendous pressure everywhere, and Xinglan feels that the difficulty of making this kind of structure is definitely more difficult than that of a space station of equal size, which was probably built in the early days of the war.

Xing Lan was more concerned about the central brain mentioned when Qi Qi and Qingkong communicated at this time, she knew from the civilization information database that there were classifications such as the Wangqi Envoy, but of course the Tianyuan people would not enter all the information of their own race, so there were only a few more common ethnic groups in the data, and many ethnic groups only had names and very simple descriptions, but after they mentioned the so-called central brain, Xing Lan realized that I was afraid that there were still some races among the Tianyuan people who had not even been entered into this civilization information database at all.

She had never heard of the central brain group before, and it was obvious from the name that this should be a group in a commanding position, but after all, the Tianyuan people were not ordinary individuals like the Zerg who were completely unconscious division of labor, so what is this so-called central brain? Could it be that the brain part of the brain is similar to the existence of a brain worm that evolves at a high speed? However, Xinglan felt that it was not very reasonable, because a group like the Star Chaser could be said to be a highly evolved group of brains, and it would not have much essential change if he had to make a giant brain that looked amazing.

So what will this so-called central brain look like......

(Thanks to "Book Friend 160228231924005" and "もふもふ?") The 10 starting coins and the 588 starting coins of "I want to ride the wind and go back" are rewarded~)