Chapter 759 The Underground Space of the Garbage Dump

If Qi Lin hadn't been more cautious, I'm afraid he wouldn't have been able to discover the Morse code hidden in it, let alone other people.

In the absence of a dedicated audio analyzer, or a skill like Qi Lin that can increase perception and endurance to the limit by accelerating energy-gathering vortices, any member of the Thunder Falcon team would be confused after receiving this buzz. There is absolutely no way to detect the underlying message.

Since it is a survival signal, it should be concise and easy to understand. Only in this way can people understand it at a glance - like those survivors living on an isolated island, if they want to put a distress sign on the beach, it must be bigger and more eye-catching. The better, there is no reason to put up a distress sign and then try to cover it up...

unless……

Unless the caller is in some kind of dangerous situation, can't other people see this distress signal?

Just like those agents in those spy movies who go deep behind enemy lines?

This explanation seems to work, but if that is the case, the distress signal should not be sent on the FM broadcast channel at all. This is not an encrypted channel in the first place. Not only is the transmission distance short, but it is also extremely easy to be intercepted... …As for cracking, all you need is an audio analyzer.

Input this buzz sound into the audio analyzer, and you can easily see a frequency curve with three low points sandwiched between six high points. At this time, even a stupid person can understand it. This is an international distress signal.

…

…

Qi Lin was sneaking and thinking about the distress signal, and unknowingly touched the outside of the LS City garbage treatment plant.

Facilities like garbage treatment plants are naturally built on the edge of cities. However, when Qi Lin walked into the garbage treatment plant, he found that it was extremely clean inside, as if it had been emptied.

Even on the eve of the outbreak of a nuclear war, most people fled the city, and the number of people left behind was definitely not small. A city with a population of millions would produce a huge amount of garbage that day. There's no reason the garbage disposal plant should be empty.

Qi Lin walked along the inside of the wall of the garbage dump, and he soon discovered something unusual - the underground of the garbage dump seemed to be empty...

There is no shelter underground in LS City. Even if there is one, the minimum standard for a nuclear shelter must be more than five meters underground. However, judging from the echo from the ground, it seems to be less than one meter below the garbage dump. , there is a huge underground space.

There was no basement in the original garbage dump. After the garbage transported here was sorted, the recyclable parts were sent to other places for processing, while the parts that could not be recycled were burned or transported to dig pits in the suburbs. landfill.

This place is too close to the city. Neither incineration nor landfilling will be carried out here. What is done in this garbage dump is only the preliminary classification work.

Qi Lin quickly found the entrance to the underground. The entrance was located behind the garbage dump. It was a four-meter-square opening with a square metal cover with a pull ring on the surface. There was no cover or camouflage around the entrance. .

The previous recycling team quickly evacuated the ruins of LS City after finding the corpses, and did not stay there for a long time. They had never been to this garbage treatment plant, so the report was naturally vague about this sudden underground space. None of them were mentioned.

There was no lock on the metal cover. Although it was heavy, it was not a problem for Qi Lin. He put the gun under his arm and gently lifted it with both hands, and a step leading to the ground appeared in front of him.

At the same time, a strong strange smell also came out from inside.

This strange smell was very special. It seemed to be mixed with a variety of volatile chemical reagents. Qi Lin couldn't tell what ingredients were in it. To be on the safe side, he took out the gas mask and put it on his head. .

Then he took out a lighter.

This is not to detect whether there is breathable oxygen in the underground space - his gas mask is fully enclosed, and the required oxygen is generated through the reaction of the oxygen generator in the reaction tank, without relying on external oxygen at all. He did this just to test whether there were flammable and explosive gases in the basement.

There are many kinds of volatile chemical reagents that are extremely unstable, and there are countless flammable and explosive types. If this gas is mixed with one or several such substances, as long as Qi Lin dares If he fired a gun in the basement or accidentally created a small spark, I'm afraid an extremely violent explosion would be waiting for him.

An explosion that occurs in an underground confined space is much more powerful than an explosion in an open area on the ground. If it really happened, it would be completely depressing.

The lighter's flame was normal. It neither went out nor exploded. Qi Lin simply threw it under the steps and nothing happened.

The danger of explosion has been ruled out for the time being.

Opening the safety of the large-caliber assault rifle, Qi Lin held the gun in one hand and a blast bomb in the other, and walked down the steps step by step.

The basement is not very deep, with a floor height of about five meters, and the top is about one meter above the ground. However, the space is very spacious, almost 1.5 times the area of ​​the garbage treatment plant directly above, and it is four to five hundred meters tall. square meters.

The dome, four walls and the ground of the basement are all made of poured cement, and meshed wire fences are used in the middle to mark out areas of different sizes, and cabinets wrapped in canvas are placed in these areas by category.

Qi Lin picked up the lighter, and when he bent down, he found that there were many wheel tracks with a width of two centimeters on the concrete floor in the basement. He estimated that these should be left by some kind of transport tool when moving these cabinets.

Qi Lin quietly approached the nearest area, pushed open the unlocked door, and walked to a cabinet.

It wasn't until he got close that he realized that it wasn't canvas that wrapped these cabinets, but a kind of synthetic fiber with a very special texture, which was very thin but very tough. He cut it with a dagger for more than ten seconds before finally cutting out A slap-wide opening was made, and it took a lot of effort to tear the opening wide enough to expose the entire cabinet.

The cabinet was made of metal, unpainted, unmarked, and, of course, unlocked.

Qi Lin hesitated for a moment, then opened the metal cabinet. The moment the cabinet was opened, a cold air hit his face -

I know what you are going to say, I have never attended the Qidian out-of-context training class...