"You mean the outlet of the vent is not on the outer wall?" Lin Rui asked.

"Yes, this is a very hidden facility. Think about it, if someone is talking here, but the sound is transmitted outside through the ventilation duct, wouldn't it have the opposite effect?" Sergey shook his head.

"Especially on the outer wall, if someone hides outside and tries to peep inside, it is easy to hear some unusual sounds. Even if the distance is short, the voice of conversations in underground facilities can't reach that far.

But as for the fan sound of the fresh air system, this is likely to become an easily exposed weakness. It is very possible to take this into consideration when building this kind of building.

Therefore, the ventilation ducts here do not lead to the outer wall, maybe through other means. For example, some underground facilities are more common, and the ventilation system will be set up near the hidden flower beds.

Make it look like a normal downspout, lawn lamp, or other similar form. "Sausage explained.

"In other words, our previous efforts are likely to find the wrong location. Because this ventilation duct needs to go around the flower bed or other locations. So it needs multiple corners.

However, within the width of only 15 cm, many corners have to be completed, which makes our antenna unable to reach out at all.

Because even if our antenna is long enough, at most two or three corners will be stuck and cannot be sent forward. Lin Rui nodded.

"That's what it means. We have to take out the antenna and look for a closer ventilation duct. From the location, it should be closer to the outside yard." Sausage nodded.

"This is a good idea. Try it, there is no other way anyway." Lin Rui patted him on the shoulder.

"You all come to help." The other mercenaries that Sausage greeted. Together, they took out the long homemade antenna from the ventilation duct.

Changed a vent and kept trying.

There are multiple rooms in this underground facility. They tried several times, and finally they tried it for the fourth time. The signal light of the communicator flashed.

"Don't move." Sausage waved his hand immediately. "There is hope this time. The signal from the communicator is instructed. The antenna should be close to the exit. Slow down and stretch forward slowly.

Oh damn... the signal disappeared again. But it should be soon. Keep reaching forward and try slowly. We will soon send the antenna out. "

A few people slowly debugged it. For about ten minutes, the signal indicator of the communicator turned on, and finally it turned from red to green when there was no signal.

"The signal is received, I don't know if the communication can be completed." Sausage sighed in relief.

"Try to contact Black Mamba immediately, and the other brothers." Lin Rui nodded.

"Black Mamba, Black Mamba, I am Kuaima. Please answer when you hear it, please answer if you hear..." Kuaima turned on the communicator and called.

Except for the noise in the communicator, there was no response sound.

"Damn it, although there is a signal, it is too weak. And a lot of interfering noise. I don't make sure they can receive it." Kuaima turned his head back.

"Keep calling, as long as we succeed once. We can get out of here smoothly, otherwise we might all die here." Lin Rui patted him on the shoulder.

None of the others spoke. But obviously, the joy of just receiving the signal has gradually faded in everyone's mind.

It is replaced by disappointment, and this disappointment will gradually turn into despair.

In the next few hours, they kept trying to call, but the other end of the communication was never connected. The signal should be too weak.

"Can you increase the transmission power?" Lin Rui turned to look at the sausage. "Think of a way, we can't just wait and die."

"The transmission power of the communicator has been adjusted to the maximum. If it fails to connect after another hour, maybe our method is useless." Sausage shook his head.

"There must be other ways. They have a communications headquarters here, and there are many other types of communicators. If it doesn't work, we can try using their desktop communicators.

The power of a desktop communicator should be greater than that of our portable wireless communicator. "Sergey looked at the sausage and said.

"It's not that the larger the communication equipment, the higher the power. In fact, our portable communicator is currently the most advanced. It is at least two to three generations higher than the communication equipment used here, and its anti-interference ability is far greater than theirs. On the communicator." Sausage shook his head.

"Are you sure?" Sergey scratched his head.

"Of course I am sure. I don't only know blasting. I am also a half-expert in communications and electronics." Sausage sighed. "I didn't tell you. Have I ever done anything at Siemens?"

"Damn Germans, you, like Yankees, like all kinds of electronic devices. But when they are actually used, they are not so reliable at all." Sergey sat on the ground somewhat disappointed.

"Put your mouth clean, I'm trying to save our lives." Sausage also became a little annoyed.

"Shut up all to me." Lin Rui stopped them. "Continue to try. If it doesn't work, try again. Can the antenna be adjusted to a position with a better signal?

We only need one successful communication to solve the problem. Instead of arguing here, or doing anything else meaningless. "

Lin Rui looked at them.

Sergey could only shut his mouth obediently, and Sausage continued to lower his head to debug the communicator.

There was a creaking noise from the communicator, making everyone's mind irritable.

This process lasted for about forty minutes, and finally once, during the call of Kuaima.

The indicator light of the communicator lights up blue, which is an indication that the communication is established. There was a noise in the communicator, full of noise.

"Received the signal... I have received the signal, what is the content of the call? What happened to your... communicator... Only one communicator is connected, but the signal seems to be very poor..." The voice that came was indeed a black mamba. But the sound was intermittent and full of noise.

"Listen, buddy, we are in trouble now. We are trapped in the building at the end of the market. The situation is dangerous now. I know the communication signal is not good... But we need support. You have to take other People rushed to rescue.

Again, we need rescue. Again, we need rescue. The position is the target position of our team's operation. We have left you GPS coordinates before. Find this place and rescue us out.

Hello, can you hear me? Please answer if you hear, answer if you hear. "Lin Rui said loudly while holding the communicator.