The tunnel of Cave No. 2 has been widened a lot in two months.
Thanks to the hard work of the Marines, who worked hard with detonators and pickaxes for more than a week, the passage was completely widened.
Through.
You have to know the tunnels in the past.
They had to be pushed sideways to the point where people could barely pass through.
While walking forward in the tunnel, Liszt raised his head slightly in surprise, and faced a stream of cool air caressing him, blowing towards the cave behind him.
Licking the corner of his mouth gently, he looked up at the slightly bright hole, and couldn't help but nodded slightly and said, "This wind feels really good."
The cool air makes people feel relaxed and happy, and the continuous wind seems to push the originally dull air in the tunnel, bringing the freshness of the heavy snow outside.
He turned his head slightly and looked forward.
There was also a little cheering at the end of the tunnel.
The corners of Karl's mouth also curled up.
He nodded with a slight smile and said: "It seems that the exhaust system of our No. 4 cave has been set up." ” "Well, this wind seems to be enough to meet most of the air needs."
Underground fortifications will always be equipped with a large number of ventilation holes, and Lister also expressed his deep understanding of this.
When he came to these caves, he could feel obviously depressed, and there was also a strange smell in the air.
Especially when a large number of soldiers pour into a cave, they sometimes experience shortness of breath.
This is undoubtedly a phenomenon of insufficient oxygen, and it also shows that the original cracks in these caves and the ventilation holes leading to the outside are not enough to allow so many people to breathe.
Now I have difficulty breathing in my daily life.
Once the war breaks out.
Some of the ventilation holes were destroyed by artillery fire.
Then it won’t just be a matter of difficulty breathing.
This is also the task that Liszt requires to be completed when preparing to transform the cave, and the importance level is directly at the forefront.
After all, he could exchange it for clean drinking water or delicious food, because after the mountainous area was blocked, supplies could not be purchased and transported at all, and could only be made up for by exchange or a small amount of self-sufficiency.
But he didn't have the luxury to exchange for the air that humans depended on for survival, which was almost everywhere in the entire space.
Although there is oxygen for diving or medical use.
But now it is obvious that as long as a few external openings are opened and the ventilation function of the original tunnel is used, breathing can be smoothed, which is much more convenient than directly exchanging air.
"It's widening the tunnel but it's too big."
As soon as he walked out of the passage, Liszt saw the soldiers who were still busy in front.
They were all holding hands with each other, carrying what seemed to be full sandbags, and he looked at the two almost carved out of the rock wall.
He could not help but frown slightly and said, "This wind is also coming from there."
He could feel the slightly cool air blowing gently from the hollow that had been dug out.
After a few turns in this No. 4 cave, the wind continued to blow into the caves along the passage.
But he looked at the rock wall that was still being carved.
Nearly four meters have been dug into the rock wall, and it seems that the work has been going on for a long time.
The Marine Corps members had a very clear division of labor among themselves.
As the pickaxe inside was swung, the rock wall that had been cracked by the detonator was cut open, and the large and small gravels were also cut open.
It fell to the ground with a splash, and was put into sandbags by other soldiers with shovels.
Then it was picked up by other soldiers and quickly carried away, walking towards the tunnel of Cave No. 5, and there was a tacit understanding between them.
"They threw gravel under the cliff of Cave No. 5."
With a smile on his face, Karl immediately took out his notebook in response to Liszt's question.
After flipping through a few pages, he quickly handed it to Liszt, pointed to the model above and explained: "We discovered This vent is located facing the wind, which simply widens the space inside, and can inject a large amount of air anytime and anywhere without the need for an exhaust fan.”
Frowning slightly, Liszt looked at the figure above.
It was a large machine-like thing that was filling the excavated rock wall.
Karl was also very concerned about the matter and said with pride in his tone: "The next plan is to widen the tops of all cave tunnels to leave space for installing exhaust systems and lines."
"Central air conditioning" Liszt raised his eyebrows slightly.
He looked at the pipes on the notebook, and the central air conditioner in an office or a large shopping mall immediately came to mind.
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This kind of machine that can regulate and meet the most basic oxygen needs and transport a large amount of air into a closed environment undoubtedly meets the needs of the current cave group.
He carefully looked at the graphics that had been sketched in pencil on his notebook.
The ventilation ducts had been spread throughout the entire cave group, and all the vents had been connected.
But he still frowned slightly, looked up at the hollow that was still being dug, and couldn't help but ask: "This doesn't seem to be a complete central air conditioner."
Karl also nodded.
He also carefully analyzed the surrounding terrain for this ventilation system, and then came to a scientific conclusion.
He proudly pointed to the lines on his notebook and said: "The consumption of central air conditioning is too large.
For today's Without energy production, we are very passive."
He said, paused slightly, and continued: "But the entrance of the cave we are in is downwind of this mountainous canyon, and mountain winds blow here all year round, so Why not use their own power?"
Looking at the lines sketched in his notebook, Liszt couldn't help but praise Carl, a top student, who just borrowed the mountain breeze from the outside and used the pipes connecting all the caves as a medium to complete the ventilation function of the central air conditioner.
Moreover, as soon as this project is completed, the ventilation problem in the cave will basically be solved.
"Exception found" But while the two were still talking about the central ventilation system, a Marine Corps soldier quickly ran over in the tunnel of Cave No. 5 with a gun in his hand.
Although he was a little out of breath, there was not much panic on his face.
He rushed out of the passage and saw Liszt and Karl not far away.
He also walked over and gave a military salute neatly: "I found that the Canadian troops were approaching "Our standard reconnaissance team marched into our area, but no heavy firepower was found, and no air helicopter support was found":