Holding the tactical flashlight in their hands, the Marines moved their feet one after another, slowly moving forward along both sides of the rock wall, and at the same time turned on the astigmatism of the tactical flashlight, completely illuminating the dim interior of the cave in front of them. And they had just gone through the narrow tunnel, looking at the vast and huge space in front of them, they couldn't help but widen their eyes, and their breathing was a little shorter.

The huge space was dim, but still visible. At a height of more than five meters, there are dense stalactites hanging upside down, and there are also some broken stalactites on the uneven ground. However, the interior of the space is not damp, but rather rather dry on some of the rock walls. It doesn't seem practical to call this a basketball court, because this space is nothing more than three basketball courts!

"Wait, why does it still smell?"

A member of the Marine Corps frowned a little puzzled, subconsciously swept the space in front of him with a tactical flashlight, couldn't help sniffing slightly, and looked at the layer of gray-brown dirt under his feet covering the ground, but let him spit directly to the side, and said helplessly: "Damn, it's still a pile of bat droppings here!" ”

Liszt also shone it with a tactical flashlight, and the ground was full of gray-brown soil. With a slight movement of his nose, a rich rancid smell suddenly appeared in his nasal cavity, and even went directly along his organs to the nerves in his brain. He also spat at at the side, nodding with a headache: "It looks like we won't be able to camp here if we don't clean up these bat droppings." ”

Those gray-brown layers of soil were undoubtedly bat droppings, although in Liszt's memory. These things seem to be a traditional Chinese medicine. Now it's just a pile of garbage. Of course, Liszt was not much impressed. What kind of ailments can be treated with this thing, but smelling the rancid smell, it is estimated that few people dare to try to use these things to cure diseases.

Exhaling slowly, Carl couldn't help but pinch his nose, letting the sour breath gradually calm down. And he turned his head to look at the rock wall in the cave, his brows were slightly furrowed, and he swept the surrounding rock formations with the pillar of light, and couldn't help nodding and said, "These bat droppings must be cleaned up." Otherwise, it will pollute our living areas. After a pause, he still frowned and said, "The air circulation is poor, and we also need a vent." ”

"Vents? It can't just be the tunnel behind us, right? ”

Liszt frowned slightly, and the rancid smell that appeared between his noses showed that there were many bat dung heaps in the cave, but it also showed that the ventilation in the cave was quite deteriorating. The tactical flashlight in his hand swept the surrounding rock walls, and Liszt gestured to the marines behind him, and said in a deep voice: "Look for it, maybe there are other tunnels in here." ”

Any one of the underground fortifications. The requirements for the vents are extremely demanding. After all, oxygen is the most critical thing for human survival, and if there is no oxygen flowing with the wind. Then the carbon dioxide deposited in the fortifications will make people feel depressed, and even feel suffocated because of the high concentration of carbon dioxide, not to mention work or fighting, even survival is a problem.

Especially among modern means of warfare, there is an option to have poison gas bombs. Once Liszt's enemies used gas bombs on them in a frenzy, the power of this extremely poor circulation cave was almost 100% explosive. And think about what the United States did in Vietnam and the Soviet Union in Afghanistan in the previous life, they all used poison gas bombs without scruples, not to mention the two major military blocs that have lasted for more than 200 years and have already lost their hearts!

"Understand, such a large cave will definitely not have only one tunnel."

Karl nodded, and immediately nodded to the soldiers behind him to make a tactical gesture, and they immediately took their weapons and walked briskly towards the interior of the cave in front of them. At the same time, they swept the surrounding rock walls quite carefully, even if they swept them under their feet and overhead with tactical flashlights one by one, and carried out Liszt's orders very seriously.

And they didn't spread out aimlessly, they all worked in pairs, and these Marines were faintly able to get help from the other two groups around them in the shortest possible time. This is their instinctive reaction after a long period of military training, but in Liszt's eyes, he couldn't help but nod, and said with a slight sigh at the corner of his mouth: "These guys, if they are tested on the battlefield, then compared to those ordinary infantry in Anchorage, they will not be much more reckless." ”

The U.S. Federal Infantry of the Anchorage Line, according to Liszt's understanding, was also composed of the elite as the mainstay, stationed at various key points, as well as the rear reserves. And those areas that are not important, or the subsequent waves of large-scale operations, are all supplemented by recruits who have been trained for months, and they are forced to fill the Anchorage defenses.

After all, the U.S. federal government is now fighting on two fronts, the law and order war in Mexico is still ongoing, and the situation in Alaska is so deteriorating that there is almost no good way to face the fact that the Anchorage Line is huge and short of personnel, except for the temporary large-scale conscription of domestic veterans and young people who meet the criteria to join the army. After all, training in a defensive area close to the front line is much faster than the rigorous military training in the rear.

But the members of this group of marines are themselves in the previous game, belonging to the elite units of the navy for landing operations or island operations. Although their weapons and equipment may not be as good as the orthodox US Army, their tenacious combat style and strong morale have already been fully demonstrated in the Pacific islands and reefs of World War II, the rainforests of the Vietnam War, and the deserts of Iraq.

"Captain Liszt, I found a tunnel, it seems that the wind is blowing again!"

Inside the cave on the left, two young marines who were holding weapons and tactical flashlights were a little surprised to find that on the rock wall in front of them, in the area that was covered by bat droppings, a rock crack of about half a meter or so was cracking, and they could even feel a slight wind blowing on their faces, bringing up the rancid smell of bat droppings, which made them cover their noses even more uncomfortably, but turned their heads and beckoned to Liszt: "This should be a vent to the outside world!" (To be continued.) )