Their voices were tinged with surprise, as if they had discovered some shocking treasure. And a young man from the Marine Corps also took out the sapper shovel behind his back with his backhand and dug hard at the point of the crevice. The crevices were full of bat droppings, which had accumulated for hundreds or thousands of years, almost as thick as a layer of soil, and with the strength of his two arms, he quickly dug up the gaps that had covered most of them.

A slight gust of wind also seemed to appear because of the dug gap, rolling up the bat droppings around it, and immediately emitting the rich rancid smell. The Marines who came around were a little unbearable to bear the thousand-year-old bat droppings, covered their noses and took three or four steps back before they slowed down, and spat a few mouthfuls to the side fiercely, before they whispered and secretly cursed to show their hatred for the bat.

"Vents? That's right, there is air flow through this rock crevice! ”

Carl, who graduated from the military academy as a top student, also walked over quickly, squatting in front of the rock crevice without hesitation, not caring at all about the rich rancid smell that almost made ordinary people vomit. With a tactical flashlight in his hand, he shone into the rock crevice, and at the same time stretched out his head to look at the space inside, and after a while he retracted his head, and said to Liszt who walked behind him with some hesitation: "It's indeed a vent, but the ventilation tunnel is too small." ”

"Too small? Let me see! ”

Liszt's brows couldn't help frowning, he looked at the crack in the rock about half a meter, slowly stepped forward, and inserted it diagonally in front of Carl, and the tactical flashlight in his hand was also aimed at the crack in the rock. Look closely at the tunnel, which is almost the size of a head. The frowning brow became more and more a Sichuan character: "It looks like it can't even fit a football." ”

The crevice looked like it was 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 over his hand, he seemed to feel a gentle breeze blowing, indicating that it was indeed connected to a vent outside. But Liszt's eyebrows were furrowed more and more, and he asked Karl regretfully, "Is there no way to continue to expand a little?" ”

"Wait, expand?"

Still squatting aside, Carl, who also had regret on his face, was slightly stunned. He subconsciously looked down at the bat droppings dug up by the sapper shovel under his feet, but it seemed that he remembered something. He directly took out the sapper shovel and poked it gently and tentatively into the rock crevice, and as the sharp edge of the sapper shovel directly sank into the seemingly rock-like soil layer, Karl's brows were stretched, and he couldn't help but shake his head self-deprecatingly: "This is not a rock wall at all!" ”

The sapper shovel in his hand was slowly pulled out, and the sharp shovel was still shining with cold light along the front, and under the puzzled gaze of the surrounding group of soldiers, Karl stabbed his arms hard and stabbed back into the soil layer of the rock wall. The polished sapper shovel, which could be used as an axe, easily pierced into the soil layer of the rock wall, and the entire shovel surface was pierced into most of it. And as he cocked hard, the thick rancid smell suddenly appeared in his nostrils.

"It's... That pile of bat droppings? But how is this possible! ”

A member of the Marine Corps behind him also looked puzzled. Ignoring the pungent smell of sourness, he also took out his sapper shovel with his backhand and stabbed it through the rock crevice. Not surprisingly, his equally sharp sapper shovel also pierced the rock-colored layer of soil directly, and with his strength, a large piece collapsed, making him glare in surprise and say, "These layers of soil don't look like those slimy bat droppings at all!" ”

"That's right, it's bat droppings."

But Liszt spoke slowly, and his hand holding the tactical flashlight also carefully shone on the bat droppings that had collapsed on the ground because of the sapper shovel, and his brows were slightly furrowed. But looking at the gap in the rock wall that had almost been dug down, Liszt turned his head and glanced at the bat droppings deposited on the ground around him, and a smile curled up at the corner of his mouth: "But the reason why these bat droppings are this color is probably because they have been accumulated for hundreds of years. ”

It's easy to calculate, because the cave was supposed to be home to the bats. And the bat community in this cave, I don't know how many generations it has experienced, it seems that from ancient times, even when the Indians were just born civilization, the ancestors of these bats have been breeding here for I don't know how many years.

And with the passage of time, bat droppings and dead bats accumulate in this soil layer, or in this small space, they have accumulated more and more, and finally with the weathering of the formation of rock-like shapes, I have to feel the magic of nature. Now that Liszt and the others have dug it down with a sapper shovel, the essence of the fragile bat droppings has been exposed, and although it is as dark as a rock, it is quite soft on the inside, and there is no hardness on the inside.

"With the path of this rock wall, maybe we can dig a passage to the diagonal top!"

The sapper shovel in Karl's hand swung more diligently, and with each exertion of the sharp shovel, a large piece of dry bat dung would fall, and he barely had a few minutes to dig a tunnel close to half a meter into the crevice of the rock. However, Karl, who was still digging, took two steps back outside, covered his nose and coughed vigorously, and said with a rather ugly face: "Damn, the smell inside can simply torture people crazy!" ”

The surrounding marines had strange faces on their faces, and even outside the rock crevices, they could feel a rancid smell like fertilizer. This is undoubtedly bat feces that have been precipitated for hundreds of years and thousands of years, and the smell makes them smell it, and their stomachs have turned over, and they can't help but subconsciously take a few steps back, no one wants to continue to work in that stench.

"The quality of oxygen here, the use of gas masks is estimated to cause hypoxia."

Frowning slightly, Liszt didn't have any good idea of this stinking tunnel, just put Winchester in his hand behind his back, took out his sapper shovel and walked over, and continued to clean up the bat droppings in the rock crevice, and at the same time turned his head to the marines behind him and said: "Everyone digs for ten minutes, rotate in turn, maybe we can dig this rock crevice completely in half an hour!" (To be continued.) )