Xu Rui had long expected that the tunnel entrance would be discovered by devils sooner or later.

After all, the tunnel network in the Dameishan Basin is so large, and there are hundreds of tunnel entrances, and you can't camouflage every tunnel entrance without any flaws, let alone not be discovered by the devil in the end, but Xu Rui really didn't expect that this tunnel entrance disguised as a tomb in Xiao Li Zhuang would be discovered so quickly.

You must know that this tunnel entrance was designed by Xu Rui himself.

So after receiving the report from the 1st Battalion, Xu Rui rushed over as soon as possible.

When Kawaguchi Heiji brought the water of the Mei River to pour into the tunnel, Xu Rui had already come to the underground headquarters of Xiaolizhuang, at this time, the straight-line distance between him and Kawaguchi Heiji, the old devil, was not even more than two hundred meters, but one was underground and the other was on the surface, and neither of them knew the existence of the other.

Although the 1st Battalion sent an observation post in the village, in the night, it was impossible to see the rank of the old devil at all.

If Xu Rui knew that Kawaguchi Heiji, an old devil, was in Xiaolizhuang right now, maybe he would really take the risk of fighting.

Xiaolizhuang belongs to the 1st battalion of the package area, when Xu Rui arrived, He Guangming was convening a meeting of his company platoon commanders, and when he saw Xu Rui coming in, He Guangming and more than a dozen company platoon commanders quickly got up and saluted Xu Rui.

Xu Rui returned the salute and asked, "Lao He, how is the situation now?" ”

He Guangming replied: "The little devils are not stupid, they have already transferred the generator set and two water pumps, and now they are diverting water to pour into the tunnel." ”

"Diverting water and pouring water?" Xu Rui smiled when he heard this, but he didn't take it to heart.

Because from the time when they first decided to build an underground network, Xu Rui and Wang Husheng had already foreseen that the devils might lead the water of the Mei River to back up the tunnel, so they asked Mei Jiuling to design the drainage canal in advance, through the drainage canal, the river water that the devil poured into the tunnel can be diverted back to the Mei River, and the outlet is still hidden under the bed of the Mei River in the canyon outside the town, and the devil can't find it at all, and naturally there is no way to block it.

However, after all, this drainage system has not been tested in real combat, and it is not known whether it can play its due role.

At that moment, Xu Rui asked again: "Does the drainage system work?" Is there any water in the tunnels now? ”

"Nope." He Guangming immediately shook his head and replied, "The situation of the drainage system is even better than imagined, the little devil just needs to transfer two more pumps, don't think about flooding our tunnel." ”

"Still can't be careless, after all, this is just the first attempt of the little devil, once it doesn't work, it's hard to guarantee that the little devil won't adjust more pumps." Xu Rui thought for a while and then said, "Otherwise, you send a few people to the drain to keep an eye on it, and report it immediately if you find any situation." ”

"Yes." He Guangming agreed, and immediately ordered a platoon commander to go to the drainage ditch.

Xu Rui said again: "In addition, check the sealed doors of each isolation area again, and the quilt must be prepared, otherwise once the little devil casts the poisonous gas, the poisonous gas cannot be closed, and it leaks into the core functional area, and the consequences will be unimaginable." ”

Guarding against the poisonous gas killing of the little devil is the focus of the defense of the tunnel warfare, Mei Jiuling specially designed the entire tunnel network into a multi-level structure for this purpose, and there is a separate isolation door between each layer of tunnels, once the little devil implements a poisonous gas attack, you only need to close the isolation door, and then cover the door with a **** quilt, which can effectively prevent the penetration of poisonous gas.

The functional area used to provide people with hiding and living is hidden in the deepest part of the multi-layer tunnel.

"Don't worry, Commander." He Guangming immediately replied, "I have checked it again and again, and there is absolutely no problem." ”

Xu Rui insisted: "It's better to check again to make sure it's safe." ”

"Yes." He Guangming said, "Check again to make sure everything is safe." ”

(Dividing Line)

Heiji Kawaguchi's mood was already very irritable.

Every ten minutes, Kawaguchi Heiji would get down from his armored command car and walk to the five high-power pumps that were roaring not far away, yes, the Japanese army used two high-power pumps to fill the tunnel all morning, but it failed to fill the tunnel, so Kawaguchi Heiji ordered three more high-power pumps to be transferred.

Kawaguchi looked at the soft leather pipe that extended from the five pumps and into the Meihe River, and felt very puzzled in his heart, why did the five high-power pumps pump water at the same time, but they could not fill the tunnel? In an instant, Heiji Kawaguchi thought of a possibility, unless the Chinese tunnels built drainage canals!

Thinking of this, Heiji Kawaguchi immediately turned his head and instructed Muto Zhang: "Muto-san, there is no need to pump water anymore, because it is useless at all." ”

"Your Excellency Commander is saying that a drainage system has been built in the tunnels?" Muto Akira pretended to be suddenly enlightened.

Muto Akira has long realized that the Chinese have built drainage ditches in the tunnels, so unless your irrigation is so large that the drainage system of the tunnel cannot afford it, it will never be possible to fill the tunnel, as for how much the drainage system of the tunnel can bear, only the Chinese know, but it is obviously impossible to do it with just a few pumps.

However, Muto Akira did not rush to talk to Kawaguchi Heiji.

Anyway, doesn't it seem that Heiji Kawaguchi is very unlevel and stupid?

It wasn't until Kawaguchi Heiji reacted on his own that Muto Akira finally "suddenly realized".

Kawaguchi Heiji pursed his lips and said angrily: "Muto-san, you don't need to pretend to be stupid in front of me, how can you not see that the drainage system has been repaired in the tunnel?" Actually, I thought about it, but I was lucky enough to expect five high-powered pumps to flood the drainage system, but now it seems that I was too naïve. ”

Muto Zhang's scheming was broken, and the expression on his face was a little scornful, but this time the sycophant was slapped on the horse's leg.

Kawaguchi Heiji ignored Muto Zhang's subtle psychology, and said in a deep voice: "It seems that the diversion of water and irrigation will not work, so let's use poison gas, but we have to do a good job of secrecy, so don't notify the reporters accompanying the army." ”

"Hello." Muto Akira paused heavily and asked in a low voice, "What kind of poison gas is used?" ”

Heiji Kawaguchi thought for a moment and said in a deep voice: "Let's use the yellow No. 2 that just arrived." ”

"Hello." Muto Sho paused and said, "Use Huang No. 2 to carry out a poison gas attack." ”

Huang No. 2 is Lewis gas, Lewis gas is a kind of erosive poison, which will make the human skin rot, if not protected or not treated in time, the injured will die because of respiratory tract and skin decay, and the death is very painful, is one of the chemical weapons prohibited by international conventions.

Heiji Kawaguchi gave the order, and the devil immediately took action.

The devil infantry who were originally guarding near the entrance of the tunnel quickly evacuated, and Heiji Kawaguchi's armored command vehicle was also evacuated more than a thousand meters away, and finally Muto Akira also set up a cordon around the entrance.

The preparations had just been made, and the three trucks of the baggage team had arrived.

The three trucks did not make many stops on the road, but drove directly into the restricted area.

The truck stopped, and dozens of anti-chemical warfare soldiers wearing protective nets and gas masks got out of the truck, and after these anti-chemical soldiers got off the truck, they carried down dozens of cylinders from the truck compartment, but these dozens of cylinders were filled with compressed gas codenamed Huang No. 2 Lewis gas.

In order to prevent the poisonous gas from backing up and dispersing into the atmosphere, in order to ensure that all the poisonous gas penetrates into the tunnel, the devil chemical defense soldiers also prepared two high-power fans, after connecting the power supply, the two high-power fans are aimed at the entrance of the tunnel and start blowing air, and then the devil chemical defense soldiers carry the cylinder filled with Lewi's compressed gas into the tomb and open the valve.

As soon as the valve was opened, yellow-brown gas bubbled out of the mouth of the bottle, and then surged towards the depths of the tunnel under the blowing of a high-powered fan.

(Dividing Line)

The highly poisonous Louis Qi surged down the corridor, rolling towards the connection between the first layer of the tunnel and the second layer of the tunnel, which was also the place where Takeo and the others on the mountain were attacked just now.

More than a dozen fighters stationed at the junction were nervously watching the two rats in the cage.

These dozen or so fighters did not know why the battalion commander had specially confessed to put two rats on the connection port, and repeatedly explained that once the rats were found to be in an abnormal condition, they would immediately close the interface between the first and second floors of the tunnel, and at the same time open the exhaust port connecting the ground on the first floor.

A dozen fighters, although they did not know, did not neglect their duties.

In fact, putting a few mice at the entrance of the tunnel was Xu Rui's confession, because Xu Rui is a traverser, he knows that the sense of smell of rats is ten times more sensitive than that of dogs, and if the little devil carries out a poison gas attack, when the dose of poison gas in the air is not enough to kill the rats, the rats will be alert, will scream, and run around.

Time passes slowly in the silence of waiting, and in the depths of this dark tunnel, you can't tell if it's day or night outside.

At one point, one of the rats in the cage screamed.

The dozen or so fighters who stood guard at first didn't pay much attention to it.

But less than two seconds later, the two rats began to squeak and scream continuously, screaming while hitting the iron cage with their bodies, as if trying to break through the iron cage and escape, more than a dozen soldiers were stunned at first, and then the squad leader led by finally reacted and shouted: "Quick, quickly open the first floor vent, and then close the second floor entrance, quick!" ”

More than a dozen soldiers immediately got busy, first moved away the bricks blocking a layer of vents, and then climbed up the ladder from a hole that was only accessible to one person.

That's right, the first floor of the tunnel is in the deepest part of the ground, but the second floor of the tunnel is above the first floor of the tunnel.

The second floor of the tunnel is the battle area, which is arranged with a large number of traps, and the third floor above the second floor is the functional living area.

This is also designed by Mei Jiuling, because the first layer of the tunnel connecting to the ground is built in the deepest part and connected with a special exhaust and drainage system, which can effectively resolve the attack methods such as water irrigation and poisonous gas of the devils, while the functional area in the shallowest layer of the surface can be protected from the threat of the devils, and if necessary, the tunnel can also be broken to save itself.