The vegetation at the bottom of the valley is kept secret from the deep vegetation, the terrain is quite complex, the ground slopes more than 30 degrees all the way down, walking is one foot deep and one foot shallow from time to time someone trips, the impact heard before is getting closer and closer, and it is almost certain that someone is here.

"Lieutenant Marshal, the voice is coming from the front!"

The guards shouted, and Bai Liyan listened carefully and said:

"Yes, it's just ahead, everyone beware, this place is weird, be careful."

"No!"

Everyone spoke in unison, continued to follow the sound to look forward, walked about 50 steps, but suddenly broke his head and hit a "mountain" at this point.

"Deputy Marshal, the voice seems to be coming from within the wall!"

Bai Liyan was surprised at this time. In front of me are earthwork, crawling withered vines and overgrown weeds, but listening to the sound does come from behind the earthwork, and it is not like the sound of stones or walls, but more like the sound of knocking on some kind of large cavity metal wall, it seems that someone is trapped in the secret room inside the wall, it is not excluded that it is Wang Qiang, Wei Qi and others.

After a moment's thought, he said:

"One team to the left and one team to the right to search for the entrance, once you find that the entrance is not allowed to trespass, come to report me immediately."

"No!"

The team was divided into two, one team to the left and one team to the right, Bai Liyan led the right team to search to the right, about 70 steps out, and found a "cave", but after a closer look, he was taken aback.

I saw a rusty metal shell hidden under the soil of the cave, and I picked off a layer of rotten leaves with a knife, and then the firelight vaguely saw a large piece of metal with silver and white slightly mottled rust, to be exact, it should be some kind of large metal body, fifteen millimeters thick, and the surface was extremely flat.

"Holy, what a!"

Before the words fell, the guards beside him hurriedly asked:

"The lieutenant has seen this?"

"No, it's not clear yet. But there are fresh footprints on the ground inside, which must have been visited by Wei Qi, Wang Qiang and others. Go, call the left team back, and get ready to go in and search. ”

"No!"

Commanding everyone to be vigilant, Bailiyan entered alone, the height of the space was more than three people high, the ground was covered with mud and rotten plants, but a large number of metal engineering structures could be seen on the top, and it was an engineering structure, although it was rusty, but it was definitely not a manufacturing process that could be achieved by the technology of the current vassal states, it was certain that this place in front of him was a favorable evidence of the existence of other advanced civilizations.

Judging from the thickness of the ground covering and the degree of structural corrosion, it is at least hundreds or even thousands of years, and it is not even ruled out that steel is some extremely advanced materials, and its corrosion resistance is much higher, so it is really difficult to judge how long it has been abandoned. Even so, it still shocked Bailiyan.

The search found a number of cables and metal parts, and the structure of the cables was equally shocking.

Different from the common outer rubber or polymer plastic, the inner copper wire or light is inserted, and the cables found are all covered with unspecified flexible rubber covers, which are hollow inside. This means that some cables are fluids that carry energy or signals, rather than using metal cores or polished brazing, but also not like gas or liquid pipes. In the case of gases or liquids, it is not possible to hold them together with dozens of pipes with a diameter of only a few millimeters.

Bai Liyan even suspected that with his cognition, it was impossible to tell what level of prehistoric civilization the current discovery was. But it is almost certain that this is a relic of advanced technology, and by no means a product of the present.

After walking a long circle, a cone-arched passage with a width of about two and a half meters and a height of more than three meters was found in the depths of the left side of the cave, and there were a large number of footprints in the soil on the ground.

At a short time, the left team returned to the confluence and it was reported that a number of similar gaps were also found on the left side, and the situation was unknown. Bailiyan decided to continue exploring the previously discovered passage.

The passage was very badly twisted and deformed, there were a lot of collapse damages, there were bare cables and unknown objects everywhere, I really couldn't think of any external force that could cause such a huge distortion, but a severely twisted and damaged door leaned against the wall, and the passage gate with a thickness of more than three inches unraveled all promises.

After careful inspection, Bailiyan found that the door was neither metal nor inorganic, but a flexible substance, and it was impossible to tell what kind of composition it was. The damaged parts collapse and soften like silicone, while the undamaged parts remain metallic and very hard.

At the same time, a manual mechanical lever airlock handle was found on the back of the door, and the manual airlock was used for backup operation after the automatic opening function failed.

It is almost certain that this is a large airtight gate that can only be used in space, and if it is a ship or a submarine, the way it opens and closes is very different due to the different gravity environment used.

That is, it should have been some kind of large space equipment, the impact caused by the fall to the ground, which formed this valley.

And judging from the size of the airlock, it is not for human use, but a larger intelligent life, which means that there have been advanced civilizations that have passed by or even invaded this planet, and it may have been caused by some accident that caused the crash, causing air pressure leakage and internal damage that killed the crew. If they succeed in their forced landing, they should have life-support equipment and at least leave other traces on the planet.

Continuing deeper into the passage, several cabins and damaged and softened airlocks were found one after another, as well as some symbols and unknown patterns on the walls, which should be some kind of text and pattern indication, and someone may have been here in the early years, and there were human and animal remains left in the cabin, and it is not excluded that some things were taken.

As the exploration deepened, other well-preserved airlocks were discovered, some of which were open and some of which were still closed. Bailiyan searched along the footprints on the ground, and finally found a special security door, where the footprints on the ground finally stopped.

"Vice-marshal, the footprints are broken here."

The guard said anxiously, Bai Liyan looked back and forth in silence, thinking back and forth, and after a moment he said:

"Stand back."

"Deputy marshal, if there is any case, his subordinates will not be able to explain to Zhao Shuai."

"If you want to stand back, I have my own opinion."

"No!"

Everyone was extremely reluctant to retreat, retreating ten steps away, Bai Liyan further approached the security door, his eyes turned to the upper right, two feet above his head, there was a row of regular black squares and unknown grooves, and three crystal protrusions with a diameter of more than ten millimeters.

There are symbols and unknown patterns on the squares, and the panels around them have been rusted, but there are faint fresh handprints, guessing that it is some kind of touch screen, or even a more advanced operation interface, if Wei Qi, Wang Qiang and others are locked behind this door, they must have touched something that should not be touched, and if the interface is effective, it means that there is still some kind of intelligent system, and the energy and core system are still maintained.

After carefully observing the interface, Bai Liyan believed that Wang Qiang, Wei Qi and others must have touched the button on the edge of the red pattern.

Not only do they leave fresh fingerprints, but they are also the most convenient to reach out, and the red pattern is an acute triangle with some faint reflections, giving the first impression that it is passable.

In other words, it could be a panic button, a panic button that can be activated after things like face scanning, retina authentication, fingerprint authentication, password authentication, or even more advanced authentication measures have failed. It will not be activated under normal conditions, and will be automatically released from use in an emergency.

Or maybe it's intentional on the part of the internal intelligence system that opens no matter what button is pressed.

After weighing it again and again, Bai Liyan stretched out her hand above her head to press the interface, and was taken aback when her fingertips touched it:

"Liquid!"

Nothing else, the button interface is neither a hard touchscreen section nor a traditional pushbutton switch, but a liquid section, with the texture of water, but no liquid adhesion, and it doesn't look like a gel, more like an egg white, but it doesn't stick to your hands.

It is unbelievable that this liquid substance will not fall or flow under the influence of gravity, and this level of technology is almost beyond Bailiyan's cognition.

The moment the interface was touched, the security door in front of him made a dull sound, and it opened to the right at a uniform speed, and everyone was shocked:

"It's open, the door is open!"

"This door is really a god, worthy of the deputy marshal."

"Look there's a light on the ground!"

At the same time that the security door opened, the dim yellow light on the surface of the passage did not seem to be fluorescent, but more like some kind of light source like a lamp rather than a lamp, which also confirmed the previous speculation that the core systems and energy equipment of the hull were still operating effectively.

And Bai Liyan began to worry that this spaceship had crashed for hundreds of thousands of years, and the core equipment was still running, which meant that the scientific and technological civilization was far above the magnitude of human beings on the earth, and this kind of advanced technology was bound to have an intelligent system and an internal defense system, Wei Qi and Wang Qiang did not rule out being hunted by the internal defense system.

Thinking of this, Bai Liyan was careful, he was not in a hurry to go deep into the passage, entered the inside of the door and checked the inner interface, confirming that there was also the same operation interface outside the door on the reverse side, and the indicator light was still always on, Bai Liyan began to believe more and more that Wang Qiang and Wei Qi had encountered the defense system.

Since the emergency system of the outer access control interface is still useful, the inner access control is in a closed state, and the integrity of the facilities should be much better than the outside access control, so it should not be invalid, since Wang Qiang and Wei Qi are locked inside, they must also press the same button when entering.

Assuming that the inner access control did not fail, Wang Qiang and Wei Qi failed to open it, apparently the system activated defensive measures, locked them in the hull of the ship, starved to death, or drove them to the closed cabin to wait for the oxygen to be cut off.

Thinking of this, Bai Liyan motioned to his subordinates to press a shotgun under the door, and then said to everyone:

"This door can be opened by pressing the red triangle button at the top of the door, and now the two of them will be left in the handle, and the rest will wait for me to enter. Remember, no matter what happens to this door later, you must not force it open with your hands, but you know! ”

"No!"

Everyone spoke in unison, leaving the two of them outside, and the rest of the people entered the passage one after another, and Bailiyan turned around as she walked, looking closely behind her.

Suddenly, the security door suddenly moved from right to left, and after hitting the shotgun on the ground, it continued to close to the left, and the shotgun pressed under the door penetrated into the security door under the nose, and finally only a muffled sound was heard, and the exposed barrel was cut raw, and the safety door fell to the bottom unscathed.

"Deputy Marshal, the iron door is closed."

The guard said in a panic, Bai Liyan's face was heavy, and he said:

"Let's go over and have a look."

"No!"

Everyone returned to the safety door again, the shotgun pressed on the door slot had been cut into two parts, picked up and looked closely, the incision was very neat, as if it was cut by a laser or a waterjet instantly, the incision was smooth and flat, and there was no tear.

Moreover, it is cut off after passing through the door, which means that the door can control the shape at will, which also explains why the safety door will become a flexible substance after failure and damage, apparently an atomic plastic substance, through some control measures, so that the inside of the door can generate and change some tools.

At the same time, no matter how the red switch is pressed, the safety door does not move. Bai Liyan believed that the guards outside the door also pressed the button, but the door still did not open, and now it was 100% certain that he had triggered the defense measures of the ship's system.