The sun had already set below the horizon, and there was no light between heaven and earth except for a faint orange-red afterglow of the sunset.

The night is gradually falling, and the surface temperature has risen by daylight, and now without the sun, it is about to drop rapidly below -80 degrees Celsius, and in such a temperature that no explorer dares to ignore it. Luo Xu drove the explorer to the outermost edge of the base, and the crumbling concrete façade parked the car, allowing it to serve as a liaison relay station to keep in touch with Bob in the distance.

After checking the equipment, Luo Xu asked the robot dog to carry a toolbox on his back, which stored an electric drill, a pneumatic hydraulic jack, a drill bit, a high-power laser launcher, plastic explosives and some weapons and ammunition.

Fifteen moving objects, four K500s, ten robot dogs, and Luo Xu himself, stepped into the outer walls of the base with cautious eyes.

Between looking left and right, magnified real-time pictures kept flashing on the neuromechanical interface, and Luo Xu kept searching for clues around him as he walked. From the signs and shapes on some of the buildings, Bob can give the function of these buildings, such as the first building on his far left, which is the place where the minerals of the Martian permafrost are extracted, from which minerals such as nickel and magnesium are extracted, and then certain alloys are added to forge hard steel materials, from which most of the metal materials of the base are derived.

Another example is the dome building, which should be an air extraction machine and other equipment, using decomposition distillation, electrolysis and other procedures to produce air components suitable for human breathing, which is one of the most important construction sites in the entire base.

Walking in the square that was almost buried by dust, Luo Xu looked at several Mars rovers and was a little speechless, these small Mars rovers transporting personnel were half buried by dust and sand, dust less than one micron entered everywhere, and without the maintenance and repair of personnel, these Mars rovers were scrapped.

"It seems that there should be no one here, I don't know if NASA has given up here."

As for the reasons for giving up, there are many reasons, such as the lack of funds for base maintenance and forced abandonment. For example, when the term of service is reached, personnel are withdrawn. Of course, most likely, the base has suffered an irresistible accident. Because of the appeal for two reasons, no matter which one it is, it will not let a few Mars rovers lie alone in the square.

Taking a deep breath of 15 °C mixed oxygen, Luo Xu identified the position of the main cabin of the base, accelerated his pace and walked forward, and when he came to the door, he shook his head, this gate is more than five meters high, and the degree of hard sealing is absolutely beyond human imagination, except for using a high-power laser, he has no way to open this door.

Just when he was having a headache about this, the robot dog kept sending back a message that a few hundred meters away from here, a hatch had been destroyed.

This information came in time, Luo Xu took the robot to the location of the robot dog, and found that it was indeed as the message said, the two-meter-high sealed airtight hatch fell directly, revealing the pitch-black space inside.

Giving the order, the five robot dogs quickly ran inside, and the xenon lamps they carried illuminated the inside as if it were day, a long and narrow room, and there was nothing unusual.

No, it should be said that there was something abnormal, when Luo Xu walked in, he immediately found that on the metal floor and ceiling, there were a large number of dark red blood stains, one after another, like blooming flowers, with a hint of uneasiness in the blood.

Luo Xu frowned, and couldn't help but hesitate in his heart, the appearance of this blood stain seemed to indicate a precursor to danger, and he didn't know whether he should continue to move forward. Finally, his gaze moved to the robots surrounding him, and suddenly his tense thoughts relaxed, and he secretly laughed at what he was afraid of with a large number of weapons.

Thinking of this, he no longer hesitated and came to the end of the room, a hatch intact.

Just as he was about to use violent means to destroy the hatch, Luo Xu let out a light "huh", and the big hand covered with metal armor wiped on the right side of the hatch, and most of the thick dust was wiped off, revealing the electronic screen with a faint blue light shining below.

"There's still electricity here?"

With some joy in the accident, the big hand grabbed the edge of the electronic screen and grabbed it, "Boom" A spark, the screen was forcibly grabbed out, and the complicated lines inside were exposed in Luo Xu's eyes. Without Luo Xu's hands, Bob commanded, and a K500 next to him stepped forward, aimed at the complicated lines, stretched out a slender probe in his fingers, and almost instantly, the hatch next to him slid open to both sides.

Before he could feel happy, the moment the hatch opened, the majestic wind blew out violently from the inside out, almost making X2 almost overturn.

"Oh no, there's still air in there."

Realizing that the situation was urgent, Luo Xu hurriedly braved the wind that kept blowing out, walked into the hatch, and hurriedly ordered the K500 guarding outside to close the hatch.

The hatch opened silently, and there was no sound when it closed, and as the hatch closed, there were only 3 K500s and ten robot dogs left around Luo Xu. But he didn't care, his eyes were in the searchlight to take in the surroundings, it was still a small rectangular room.

"What's going on?"

There was no expected scene, Luo Xu took a few steps forward with some confusion, and the six positions of "......" sprayed white high-pressure gas at different angles, and Luo Xu's x2 happened to be right one by one.

"What is this?"

Luo Xu was startled, and then calmed down, and the mechanical interface showed the information detected by Bob, these gases are all ethylene oxide, which is used to eliminate the virus fungus on the spacesuits of the outgoing personnel, according to international agreements, the environment on Mars must ensure that it is not polluted by the life of the earth, so these measures are a necessary safety process.

"Then that room was a pressurization room at the beginning."

The disinfection process was quickly over, and the hatch in front of it opened automatically, and under the faint blue light, the corridor in the depths was so blue that it was impossible to see far. But don't worry about this, the xenon lamp on Luo Xu's armor has a wide irradiation range, and any darkness in front of him will be expelled under its illumination, leaving only the light like day.

The five robot dogs took the lead, with extremely flexible limbs, and ran into the dimly lit corridor to the depths, and if they found any clues ahead, they would notify Luo Xu, and they would not be unable to react when encountering danger.

"Well, there's blood on the ground!"

The corridor was not peaceful and peaceful, and when he walked into the corridor, Luo Xu also found a long string of blackened blood stains on the ground, and he didn't know who left it, anyway, no body was found around.

"Well, now it looks like this Martian base must have encountered some kind of accident."

Luo Xu pondered, and this accident seems to be quite serious, judging from the results of the oxidation of the bloodstains, a long time has passed, but there is no support personnel sent by NASA. No, either they were not dispatched, or all of them were killed, and the latter conclusion is clearly more correct in any respect.

This corridor is not long, after turning the corner for ten meters or so, there is a room, the faint blue light is not enough to illuminate the surrounding environment, but under the illumination of Luo Xu and other searchlights, I can see the situation clearly, this should be a room similar to a lounge, there are a few tables, and there is a fully automatic coin-operated drink machine in the corner of the room. It was supposed to be a harmonious scene, but at this time, the large amount of blackened blood on the table was inevitably a bit of a fly in the ointment.

"Well, this is PDA?"

With a flicker of Luo Xu's searchlight, I saw a five-inch electronic product under the table, which made the K500 look like a smartphone with a bezel-less design. I took the PDA and checked the button, but there was no response after pressing it, and sure enough, there was no power.

However, the socket of this thing turned out to be an AT-11 standard socket, and Luo Xu's arm armor bounced off, and he directly pulled out the line and inserted it into the socket of the PDA.

With the output of the power supply, the PDA quickly activated, and a NASA rotation pattern rotated a few times before entering the main interface. With the O** function, Luo Xu can directly let X2 exchange data with the PDA in his hand, and he doesn't have to stare at the narrow screen to see, his eyes move up and down, and the neuromechanical interface shows all the PDA data in front of his eyes.

"Bertram Annison's troubles? What is this? ”

Luo Xu frowned, looking at the English on the interface, he couldn't help but feel a big headache, he thought that there would be some major clues in it, but now it seems that he has thought too much. This PDA is a personal handheld device called Bertram Annison, which records his video notes of more than 1,000 G, covering two years before and after, Luo Xu quickly flipped through a few times, and most of the videos were complaining about how bad the conditions on Mars were, how his colleagues were unfriendly to him, and he cursed this hateful place.

The only clue is probably the time when the video was recorded, in 2025, seeing this time, Luo Xu was startled, and immediately calmed down, this world is a parallel world can be determined, you want Luo Xu to believe that in 2025, Americans can build such a huge base on Mars, it is better to ask him to believe that the cow can fly on its own in the sky. In short, Luo Xu didn't have the interest to take the time to look at a bastard's complaint after a few glances, copied all the PDA's data, and popped the PDA casually, Luo Xu continued to step on the passage in front of the lounge.

The exploration of the five robot dogs was fruitless, and finally Luo Xu simply called them all back, and gathered together in front of an elevator door at the end of the passage.

The buttons of the elevator include two floors underground, four floors above ground, and a total of six floors, Luo Xu thought about it, the underground is generally a place to display large equipment and raw materials, and he is still ready to go to the top to have a look.

Pressing the button on the second floor, the elevator started running without making any sound, and it almost didn't feel like time was passing to the second floor.

The elevator doors slowly opened to the sides, revealing a cross passage with a faint blue light, Luo Xu sighed, and let the six robot dogs explore to the front and left, while he himself set off to the right with three K500s and four robot dogs.

Walking along the passage, the silent environment and the oppressive light made people faintly uneasy, Luo Xu took a deep breath to calm his heart, his arrival seemed to be sensed by the milky white hatch in front of him, and the hatch automatically slid open to both sides.

Inside the hatch seems to be an office room, all kinds of plexiglass screen computers are neatly displayed in the room, and directly opposite is a wide floor-to-ceiling glass, outside the glass is a very large space, all kinds of drives and manipulators that provide linear or rotary movements, after losing the instructions of the automatic control system, stay alone and quietly in place and remain motionless. (Can today's recommendation reach 520?) ）

;