The tunnel, which had been able to be climbed and accessed only with great difficulty, had been opened up by the young men in the space of two months with electric drills and pickaxes, as well as a small charge of detonators. Now the height of about one meter six or seven, and the width of less than half a meter, although it is still uncomfortable to walk, at least there is no need to climb in and out.

With his head down, Carter also followed cautiously, and he was relatively small, but now he had some kind of advantage. At least he only had to lower his head slightly when he walked, and there was no difficulty, but for Liszt, it was almost a matter of bowing his head and hunching his waist, and he could only pass in front of him with his body bent, which was quite uncomfortable.

"If there is a chance in the future, I should really widen this tunnel again."

Touching the ruddy touch on his forehead that was touched by the rock wall, Liszt also had a little helplessness on his face, but he also shook his head, thinking about it, he knew that it was unlikely. After all, the surrounding geology is rock formations, even if there is a soil layer, it is also frozen soil in winter, and there is no difference between digging and that rock formation, and this tunnel was originally completed with a detonator explosion, otherwise it would not be as simple as it is now.

Karl, who stretched out his hand, also shrugged his shoulders, and didn't answer much to Liszt's words, they have been together for a long time, and they already know each other's personalities. As Liszt's adjutant, Karl is also quite competent, and generally there are some small things that do not need to be mentioned by Liszt, he already has a detailed plan, and he is also starting to prepare.

Leaving the narrow passage, Liszt had just stepped into Cave No. 2 when a light like day shone through, making him unable to help but squint his eyes slightly. And he subconsciously looked up. Look at the three headlights hanging from the rock wall overhead. I couldn't help but turn to Carl and asked, "The lighting system seems to have been built?" ”

"The commissioning was just done this morning. The lighting system for Cave 2 has been put into use. ”

Carl nodded slowly, and at the same time rubbed the corners of his eyes with his hands, he didn't have Liszt's recovery ability, but he didn't adapt to the bright environment so quickly, but as the tears relieved the stinging sensation in his eyes, he gradually opened his eyes in this light, glanced at the inside of the cave, which was no different from the daytime, and said with a smile: "And the exhaust system is also being debugged." ”

His gaze swept slightly over the corners of Cave No. 2. More than a dozen soldiers of the Marine Corps were gathered there, and with the help of pulleys on the rock wall, an exhaust fan was transported to it, as if it was installing an exhaust fan, and they also reported to Liszt: "The ventilation hole tunnel over there is about forty meters long, connecting a cliff outside world, and it is one of the most important ventilation holes in Cave No. 2. ”

The exhaust fan was gradually pulled up with the help of pulleys, and was safely erected in the rock crevice that had been carved out with a pickaxe, and a Marine soldier also pulled over the wires and sockets, and connected to the industrial storage box not far away. The entire exhaust fan has also slowly rotated, making a slight sound.

Carl pulled out the notebook in his pocket. After quickly flipping through a few pages on it, he found the installation and commissioning of the exhaust system, and handed it to Liszt: "This gap belongs to a tunnel that can climb people, and we have also arranged for someone to install an exhaust fan five meters outside, so as to ensure that a large amount of fresh air is absorbed into Cave No. 2 at any time." ”

"It's very well designed, and it's very scientific."

Looking at the design drawings drawn in the notebook, Liszt also nodded, which outlined the No. 2 cave with very professional lines. And he looked at the pattern that symbolized the ventilation hole, and subconsciously glanced at the exhaust fan that had just been installed and was slowly rotating, and still frowned and asked, "But is the exhaust hole outside camouflaged?" ”

No one wanted the Soviets to know about the vents of the caves, otherwise a large number of poison gas bombs would permeate the mountainous area, and they would take special care of these vents. Liszt believed that the Soviets had done it, and Karl was already prepared: "Yesterday it was all camouflaged, and if you don't look closely, you can't find that the stones that are stacked together actually have quite large gaps to provide oxygen." ”

"If the exhaust holes are installed, the exhaust air to other caves will also follow."

Nodding slowly, when everything was on track, Liszt was already relaxed. He continued to walk forward, although Cave No. 3 and Cave No. 4 were both in Cave No. 2, they were more than 300 meters apart, and the mountains that each extended were different. This is also the reason why Liszt arranged the placement of weapons and equipment, as well as the placement of ammunition. The arsenal could not be gathered together, and he knew quite well how many tight underground fortifications had collapsed and disappeared because of the explosion of the arsenal.

Cave No. 3 was filled with detonators, explosives, rockets, bullets, grenades and other materials, and the area of less than 200 square meters was already stuffed, which was the guarantee for Liszt's troops to continue fighting. Just outside the mouth of the tunnel, five Marines had already loaded their bayonets and vigilantly swept the surrounding situation.

It was an area where anyone could enter it and was most heavily guarded, and even their own people had to have Liszt's signature to enter it and take detonators or explosives. And when you enter, all the things that can ignite the fire are also handed over, after all, those things only need a little spark, and they can open a big hole in the entire cave warehouse, and then lift up the entire surrounding soil layer, and bury them all inside!

"The defense of Cave No. 3 is very strict, but there is no need to check it."

Glancing at Cave No. 3, where Liszt personally gave the death order, he still quite agreed with the self-discipline of these marines. And he turned his head to look at Cave No. 4, especially the dim tunnel, and said to Karl: "It is better to lay the lighting system as well, after all, the connected No. 5 Cave also has sufficient ventilation holes to ensure internal air circulation." ”

Karl glanced at the notebook he had retrieved, but nodded and said, "There are already arrangements, but Cave No. 5 still needs to be renovated, after all, we have only discovered this cave for less than half a month." After a pause, he still smiled and shrugged, "But Cave No. 5 also has an entrance to the outside world, at least our actions have expanded a little." ”

PS: It's a little late, but I'm still making up for it quickly, cough cough, I'll also code the word vigorously tomorrow morning, and I'll burst the liver tomorrow! I hope you will continue to watch it coolly, how to say that the weekend is also the time of ten thousand watches! (To be continued.) )