Their voices were full of surprise, as if they had discovered some shocking treasure.
A young man from the Marine Corps also took out the engineering shovel from his back and dug hard into the gap a few times.
The gap was filled with bat guano, which had been accumulated for hundreds and thousands of years.
It was almost as thick as the soil.
With the exertion of his arms, he quickly covered most of the gap.
Dig.
A slight wind seemed to appear because of the dug gap, picking up the dug bat guano around it and immediately dispersing the strong rancid smell.
The Marines who gathered around were a little unable to bear the thousands of years of bat excrement.
They covered their noses and took three or four steps back before they recovered.
They spit fiercely to the side a few times before lowering their heads.
He cursed secretly to show his hatred for the bat.
"The vents are correct, there is indeed airflow through this rock crevice."
Karl, who graduated from the military academy as a top student, also walked over quickly and squatted in front of the rock crevice without any hesitation, not caring at all about the strong putrid smell that would almost make ordinary people vomit.
Holding a tactical flashlight in his hand, he looked into the crevice and at the same time stretched his head to stare at the space inside.
After a while, he retracted his head and said hesitantly to Liszt, who was walking behind him: " It is indeed a vent, but the ventilation tunnel is too small.”
"Too small, let me see" Liszt couldn't help but frown.
He looked at the rock crevice about half a meter away, and slowly stepped forward, leaning in front of Karl.
The tactical flashlight in his hand was also aimed at the rock crevice. .
Observe carefully the tunnel that is only about the size of a head.
The frown became more and more like "Sichuan": "It looks like you can't even fit a football into it."
The crack in the rock seemed to be about half a meter wide.
The height is also close to two meters, but the tunnel space inside is less than the size of a football.
Slowly reaching out his hand, he seemed to feel a gentle breeze blowing by, which meant that it was indeed connected to a vent outside.
But Liszt's eyebrows were already wrinkled more and more, and he asked Karl regretfully: "Isn't there a way to expand it further?"
"Wait, expand" Karl, who was still squatting aside with the same regret on his face, was slightly stunned.
He subconsciously lowered his head and looked at the bat guano dug out with an engineering shovel at his feet, but he seemed to remember something.
He took out the engineering shovel and poked it gently into the rock crevice.
As the sharp edge of the engineering shovel sank directly into the soil layer that looked like a rock wall, Carl's brows felt relieved.
After unfolding it, he couldn't help but shook his head in self-mockery and said: "This is not a rock wall at all."
The engineer shovel in his hand was slowly pulled out, and the sharp shovel edge still had a cold light in front.
But in the puzzled eyes of the surrounding soldiers, Karl used both arms to forcefully pierce the rock wall again. in the soil layer.
The engineer shovel, which had been polished and could be used as an axe, easily penetrated into the soil of the rock wall, and more than half of the entire shovel surface was penetrated.
And as he cocked it hard, the strong rancid smell suddenly appeared in his nostrils.
“It’s that pile of bat guano but how is that possible?”
A member of the Marine Corps behind him also looked puzzled.
Ignoring the pungent sour smell, he also took out his engineering shovel with his backhand and stabbed it fiercely into the rock crevice.
Not surprisingly, his equally sharp engineering shovel also directly pierced the soil layer that looked like a rock.
With his strength, another large piece collapsed, making him stare in surprise and said: "These layers of soil look nothing like those slimy bat guanos."
"Yes, this is indeed bat guano."
But Liszt spoke slowly, and the hand holding the tactical flashlight carefully shone on the bat guano that fell to the ground due to the engineering shovel, but his brows furrowed slightly.
But looking at the gap in the rock wall that had almost been dug out, Liszt turned his head and glanced at the bat guano deposited on the ground around him.
He raised a smile at the corner of his mouth and said, "But the reason why these bat guanos are this color is , probably because it has been accumulated for hundreds of years.”
This is easy to deduce, because this cave should have been the home of that group of bats.
As for the bat community in this cave, I don’t know how many generations it has gone through.
It seems that from the distant ancient times, when even the Indians were just beginning to develop civilization, the ancestors of these bats have been thriving here for who knows how many years.
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As time goes by, bat feces and dead bats accumulate in this soil layer, or in this small space, more and more accumulate over time, and eventually form like this due to weathering.
With its rock-like appearance, you can’t help but feel the magic of nature.
Now that Lister and the others dug it down with engineering shovels, the nature of the fragile bat guano was exposed.
Although it was as dark as a rock, the inside was quite soft and not at all hard.
"According to the trend of this rock wall, maybe we can dig a passage leading diagonally upward."
Carl swung the engineer shovel in his hand more diligently.
Every time the sharp shovel edge was exerted, a large piece of dry bat guano would collapse, and he barely had a few minutes to follow the original shape of the rock crevice. , a tunnel of nearly half a meter was dug directly inside.
However, Karl, who was still digging, took two steps back outside, covered his nose, coughed hard, and said with a rather ugly face: "Damn, the smell inside can torture people crazy."
The faces of the surrounding Marine Corps members were also quite strange.
Even if they were outside the rock crevice, they could feel a putrid smell like fertilizer.
This was undoubtedly bat guano that had been deposited for hundreds and thousands of years.
The smell made their stomachs churn when they smelled it.
They couldn't help but subconsciously took a few steps back.
No one wanted to continue to be there.
Work amidst that stench.
"The quality of oxygen here, using a gas mask will probably cause hypoxia."
Frowning slightly, Liszt had no good solution for this stinky tunnel.
He just put the Winchester behind his back, took out his engineer shovel with his backhand and walked over, vigorously removing the bat guano from the rock crevices.
While continuing to clean up, he turned to the young Marines behind him and said, "Everyone digs for ten minutes, taking turns.
Maybe we can completely dig out this rock crevice within half an hour
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