The most critical reason why gas masks can protect against respiratory poisonous gases is that they can filter the air.
The layers of filters in the gas mask can intercept any non-oxygen particles, thereby ensuring that the human body can breathe the air correctly.
But during the filtration process, even some of the oxygen will be blocked, causing an oxygen-deficient environment.
Lister and the members of the Marine Corps are very aware of this, especially in this cave with insufficient oxygen.
Using a gas mask is probably not anti-odor, but a kind of torture.
He just took out the towel from his backpack, folded it into a triangular towel, poured water on it, covered his mouth and nose, held his breath and vigorously waved the engineer shovel, as if he wanted to do it in the shortest possible time.
Within a period of time, all the rock cracks should be dug out.
In fact, the progress of their project was extremely fast.
With the rapid excavation of more than 20 people, they had already penetrated the tunnel to a distance of nearly 20 meters.
Especially the rock tunnel that seemed to be winding and dug diagonally upwards.
It was known that the opening outside the mountain should be halfway up the mountain and further up.
But now there is no longer one person digging in front, because the excavated bat excrement has piled up at the bottom of the rock crevice.
Someone must quickly sweep backwards with an engineering shovel to maintain the tunnel, which is less than half a meter wide.
It will not be re-blocked by bat guano dug out from above.
Even in the cave, more than a dozen piles of bat guano excavated from the rock crevices are piled there.
If it is not cleaned up, it is probably a joke to live in it in the future.
As they dug, the Marine at the front narrowed his eyes slightly.
After digging through a slight bend.
His eyes had seen it right in front of him.
In that football-sized vent.
A little light had appeared, which made him widen his eyes and shouted to the back: "Hey, it's just in front, I saw the sunshine in front of me."
As he spoke, he exerted rapid force, and large chunks of bat guano quickly collapsed and fell off with the sharpness of the engineer's shovel.
And the clarity of the sunlight in front of him became more and more obvious.
Even according to his calculations, as long as they dig hard for a few minutes, about four or five meters away, they can reopen this rock crevice that is completely buried by bat guano and open up a road to the outside world.
"Great, our plan was right."
Liszt also tightened his grip on the engineering shovel in his hand, and slowly straightened up next to the dozens of piles of bat guano.
Looking at the Marines who were also busy around him, there was a bit more smile on his face. .
Turning to face Karl who was looking at him from the side, he couldn't help but nod: "As long as we can open a new tunnel, then the ventilation problem in this cave can be solved."
"Solving the ventilation problem is only the first step.
We still have piles of bat guano to clean up.
Especially now, it seems like the workload is not that small."
Nodding slowly, Karl also straightened up gently.
Nearly half an hour of continuous bending work made his spine a little tired.
Rubbing his back vigorously, he looked at the dozens of piles of bat guano in front of him.
The tactical flashlight in his hand also swept towards the entire cave, but a wry smile appeared on his face: "And on the ground in most areas, we We haven’t cleaned up the bat guano yet, and if nothing else happens, we’ll need a week’s work to finish it all.”
"A week won't do.
It's too long."
Liszt also frowned slightly.
He turned around and looked at the dozens of piles of bat guano inside.
These were just taken out of the rock wall tunnel.
Adding to the cave floor of more than a thousand square meters, it is estimated that there are another ten piles.
A few piles are fine.
Sighing slowly, Liszt inserted the engineer shovel into the one-meter-high pile of bat guano next to him, nodded slowly and said, "It's time to add more manpower."
It would be impossible to completely clean a cave over a thousand meters long without a week.
Moreover, the more than twenty of them are not robots.
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If they want to clean and take care of things every night, they simply cannot stay in this cave with a strong putrid smell.
Especially looking at the huge cave space, Liszt thought about it in his mind and said to Karl: "Continue to recruit twenty people to form a platoon-level unit.
Forty people will take turns to clean up, which should shorten a lot of time."
"Captain Liszt, we have dug through this rock crevice."
A surprised cheer appeared in the cave, immediately interrupting the conversation between Liszt and Karl.
In the half-meter-wide crevice of the cave, the soldier with a towel tied to his mouth and nose was carefully sliding down and taking a deep breath, but the still strong rancid smell made him cough instantly, and at the same time He waved to Liszt and said: "There is a cliff above this rock tunnel.
You can even see the entrance of the cave where we came from from more than 500 meters away."
"What?"
Liszt raised his eyebrows slightly, and immediately walked quickly towards the crevice.
At the same time, Karl behind him also quickly followed.
The cool breeze seemed to appear in the rock tunnel, blowing and removing some of the rancid smell.
And he moved forward quickly, climbed directly up the tunnel that was winding and diagonally upward, and strode toward the glimmer of light at the top.
This tunnel is not crowded.
It is basically half a meter wide and more than two meters high, just like a raised eye.
And Liszt quickly stepped up in the tunnel.
After ascending several high slopes of more than 70 degrees, an obvious light appeared in the tunnel in front of him, which even the tactical flashlight in his hand could not cover.
"This cave really has another exit."
And the freshness of the air had completely driven away the rancid smell of bat guano.
Liszt walked quickly towards the light, and couldn't help but squint his eyes slightly.
After he gradually adapted to the light, he slowly Slowly opening his eyes, looking at the lush primeval forests of the Rocky Mountains and the blue sky and white clouds outside, he couldn't help but take a deep breath: "It's really coming out."
But a strange sound made Liszt's ears move slightly involuntarily, but he raised his head instantly, and a dense stream of data burst out from his eyes, and between the blue sky and white clouds, An American federal F15 fighter jet was roaring towards the distance, and its extremely fast speed had already drawn a long line in the clouds.
But it is definitely not a normal cruise, because right behind it, two Soviet MiG-25s are fighting tightly behind it, and they have launched an attack posture from top to bottom: