"Boom!"

The can slammed against the airtight door, making an even more dull sound, but other than that, nothing happened.

"Is it thermal infrared induction?"

"Bang la", Qi Lin rubbed a burning stick, and then threw it over, the red and white fire light emitted by the burning stick instantly illuminated this small area, although the burning stick was a low-temperature flame, but it was completely enough to trigger thermal infrared detection...... However, the mechanism in Qi Lin's "expectation" was still not triggered.

“……”

Qi Lin was silent for two seconds, and then cautiously walked to the airtight door and wiped the loess covering the door with his hands.

In addition to the mottled emblem of the Republic, the airtight doors are painted with three cut-corner square font numbers - "404".

Seeing these three numbers, Qi Lin couldn't help but blurt out: "404, Not-Found?" ”

"404, Not-Found" is a well-known HTTP status code on the Internet in the old days, and it means that the address entered by the user cannot be indexed or does not exist when browsing the web.

In the early years of China, there was also a city called "404", which was a city that could not be found on the map, and at the beginning of the establishment of this city, it was to set up a base for the study of nuclear weapons.

Although this city has gradually ceased to be a secret, the "404 City" is still not available on ordinary maps, and no mail or courier can be sent to this "non-existent" city.

So, whether it's that 404 error code on the Internet, or that "non-existent" city, or this airtight door in front of you...... What does this arsenal have to do with it?

Could it be that this is an arsenal that "does not exist" and "cannot be found"?

Qi Lin's heart became more and more puzzled, and the range of movements in his hands increased again, and soon, he scraped off all the loess stained on the airtight door.

After the entire circular airtight door was revealed, in a corner on the lower right, Qi Lin found a very inconspicuous card slot.

Qi Lin put the gray card on the card slot and compared, and the size was exactly the same.

"That's supposed to be here, yes......"

Aligning the gray card with the card slot, Qi Lin carefully inserted the entire gray card into it.

"Whew-"

After the gray card was inserted into the card slot, Qi Lin clearly heard the sound of gas jetting from behind the metal airtight door, and then, the entire airtight door that had been sealed in dust for many years began to rotate slowly.

A lot of dust was instantly shaken down, permeating the secret passage, Qi Lin hurriedly covered his mouth and nose, and the airtight door kept turning a full three hundred and sixty degrees, and then it retracted back by more than ten centimeters and rolled into the side behind the door.

This kind of airtight door, all of which are large hydraulic systems, the thickness of the door panel alone reaches fifty centimeters, which is nearly twice as thick as the door of the shelter in reality......

The airtight door with a diameter of two meters slowly opened, and Qi Lin exerted his dark vision ability to the maximum to look inside, however, it was only a metal tunnel for one person to pass through, about 100 meters or so, and there was a corner at the bottom of the corridor, so that Qi Lin's line of sight could no longer peek in.

"It's really...... Is it an arsenal? ”

Qi Lin was puzzled, it was not that he had never seen such a facility as an arsenal, but it was really the first time he had seen this kind of facility.

Extinguishing the burning stick, Qi Lin climbed into the corridor.

As soon as his feet touched the metal floor of the corridor, a column of dark blue cold lights instantly lit up in the corridor, and the airtight door behind him suddenly "slammed" shut.

"Grass?!"

Qi Lin immediately ran to the airtight door, only to see the gray card being spit out from another card slot behind the door, but when Qi Lin wanted to insert the card back again, the card slot seemed to be blocked, and he couldn't insert it.

"One-way channel?"

After trying many times to no avail, Qi Lin turned his head and looked at the road in front of him, which had been rendered into a dark blue by the cold light, and couldn't help but feel a strange illusion in his heart.

This corridor is full of a strong sci-fi style, and when you are in it, it seems to have traveled into some sci-fi movies - in Qi Lin's impression, only those facilities such as research institutions like to make this kind of tune, and the Chinese military has always liked the style of fortitude and iron-bloodedness, if this is an arsenal, it should definitely not be like this!

Qi Lin first carefully inspected the metal walls, ceilings and floors on both sides of the corridor, and found that the corridor seemed to be made of metal cast in one piece, and there was no splicing gap at all - this also confirmed Qi Lin's speculation that if the military wanted to strengthen the corridor, there was no need to use such flashy methods.

Moreover, after this corridor has been closed for so long, the air inside is still very fresh, that is to say, there should be a ventilation duct connected to the outside in this "404 Arsenal".

Qi Lin dipped a circle of saliva on his index finger, and then stretched it into the air-

"Huh?"

As a rule, if there is fresh air, the direction of the rush should be the end of the corridor, but after three minutes, there is almost no difference in the speed of water evaporation in all directions of the index finger.

Qi Lin once again set his sights on the metal wall of the corridor - in the old era, there was indeed a nano metal material that looked very flat and smooth, but in fact there were countless small holes on it that could not be seen by the naked eye, which could allow gas molecules to pass through - but the price of this material was very expensive, if this 100-meter-long corridor was all made of that material, plus the ventilation device at the back......

That's sky-high!

"Here...... What exactly is the place? ”

Obviously, if you want to know this answer, you can only go inside.

With the help of the faint blue light, Qi Lin began to slowly move along the corridor with his gun in hand, but with each step forward, the uneasiness in his heart deepened.

The rubber-soled military boots stepped on the smooth metal floor, and the sound made people couldn't help but feel a little creepy, Qi Lin suddenly felt that this scene should not be a pure science fiction movie, but something similar to Resident Evil, Alien and the like.

The zombies in Resident Evil can be seen everywhere in the wasteland now, and as for the monsters of the opposite sex, the strength of the E-level to D-level is only about E-level to D-level if they are killed...... It's just that it's not the monster itself that's terrifying, it's the tension and sense of the unknown that is enough to make people hang every nerve.

If a few zombies suddenly rushed out at the end of the road now, screaming to come up and gnaw off Qi Lin's nose, the stone hanging in Qi Lin's heart could be half lowered, even if it was a person of the opposite sex or a predator or something, but he just didn't know what was waiting for him at the end of the road, this was the most fatal!