Dong Ku's words made everyone's eyes focus on him, and they all stopped their movements, waiting for Dong Ku to give an answer.

"Sir, stop transporting gasoline and mobilize all liquefied gas tanks."

Dong Ku's order made everyone confused for a while. Is the liquefied gas tank the gas under the ground where the cooking is done? Can it replace oil?

Seeing that he was confused, Dong Ku explained with a smile: "Liquefied gas is a gas, it is easier to spread in the air, the concentration reaches a certain level, and the power of its explosion is more powerful than explosives, the most important thing is that the air explosion, there is no blind spot, and all places in the space will produce expansion force, even if the Japanese army hides in the corner and can avoid the flames, but it can't avoid the air explosion around them, so it is not difficult to clear the Japanese army in the tunnel at one time." ”

"And after the explosion, the flame will erupt along the spacious place and eventually break through the ground, but due to the lack of oxygen, it will not burn violently inside, and after the explosion, too much methane and other burning substances will be consumed, and there will not be too many flames in the tunnel, which can also ensure that the gas bomb will not be detonated."

"Is it so powerful?"

Liu Yucheng asked suspiciously.

Dong Ku saw that everyone was like this, and he also understood that they really couldn't imagine what the liquefied gas would look like when it exploded, after all, the liquefied gas had only been used for a short period of time, and because there was a strict operation manual, there had never been any danger, so they didn't know the power of this kind of thing.

"Don't worry, sir, if there is no accident, it is enough to blow up the Japanese troops in the tunnel at one time, and no matter how bad it is, it will stun them and destroy the tunnel."

"Okay."

Liu Yucheng still couldn't believe it, but he didn't refuse to carry out the order, and picked up the phone to change the order again.

In Harbin, because the liquefied gas pipeline has not yet been laid, there are only liquefied gas tanks, regardless of shape or capacity. It is similar to that of later generations, because it has not yet been popularized, so there is a stack of new liquefied gas filling at the gas storage station, and it is not a trouble to transport it.

"Seal off all the open spaces, and don't allow any Japanese troops to go up to the ground tonight. Tank units opened all the tunnels along the front. ”

"Yes!"

Qu Jungang and other attacking troops were ordered to start deploying.

In a very short period of time, truckloads of liquefied gas tanks were transported to the front of Shuangcheng, as well as to the direction of Qiqihar and Tumen, and the few stores in Qiqihar were also concentrated and sent to the front line.

The tank troops rumbled to the front tunnels, and several vehicles in small groups, and the bombardment of artillery hits, blowing holes in the front bunkers of those tunnels, and then retreating.

The iron fist of the Japanese army was useless. They didn't dare to come out on the front, and I don't know how many sniper guns were aiming at the front in the distance, and if they went out to blow up tanks, they were looking for death, and it was difficult for them to show their faces without helicopters in the sky. The artillery was all burned, and they didn't even have the least means to block it, so they could only be in the firing port, helplessly watching the tanks of the advance army blow up the bunkers one by one. I gritted my teeth with hatred, but I couldn't help it.

When the tank rumbled back. Leaving behind the hewn bunkers, they returned to the line of defense in the twilight.

The gasoline engines on those bunkers roared one after another, and the searchlights lit up one by one, illuminating all the open spaces of the bunkers at night, and helicopters were on duty in turn. Waves circled in the sky to prevent the Japanese from counterattacking from the ground.

Dong Ku personally led a team of soldiers in the night, rode in a tank, and went straight to the bunker next to the cleared tunnel. Several infantry vehicles, in the package of tanks, went straight to that tunnel. Let the Japanese troops in the distant tunnel stare at the thick tanks, unable to attack the infantry vehicles in the middle.

They didn't know that once they blew up an infantry vehicle, it would be a big explosion, and several of the infantry vehicles had no one in them, and they were all pulling liquefied gas tanks, and once they exploded, it would be a big bomb.

Entering the tunnel, several soldiers moved quickly, according to the first tunnel to get the entrance to the second floor, one bomb after another was placed, and then, the tunnel exploded with a bang.

"The enemy attacked !!"

"Enter the combat position!!"

The lights in the tunnel were all extinguished, and the Japanese army quickly deployed the defense by virtue of their familiarity with the environment. They already knew that the advance army would not enter the trap again, so no one over there went over, and they all gathered near the entrance of the second floor and in the mezzanine of the second floor, ready to inflict heavy damage on the enemies who dared to enter.

The entrance of the passage was blown open, and the soldiers threw down their grenades, and then, with a loud bang, screams came.

The two soldiers slid down the smoke at the entrance to the main tunnel, and two more grenades were thrown into the tunnel amid the screams of the Japanese soldiers.

In the roar, the two grenades did not work, but the noise of Japanese troops and the sound of iron doors closing in the distance could be heard.

The two soldiers knew that the Japanese army had closed the iron gate thirty or forty meters away from the tunnel and piled sandbags behind the door, but they did not plan to attack, but felt the wall to estimate the approximate location, quickly pressed the director bomb on the wall of the mezzanine, and then threw smoke bombs and gas bombs one by one, and quickly withdrew.

"Poison gas!!"

In the darkness, the Japanese soldiers shouted in panic and put on gas masks. They didn't know how the advance army of the road would attack, but the advance army of this line of defense was stranded for a day and suffered heavy losses, which gave them a lot of confidence, especially the iron gates in the tunnel, the iron plates one centimeter thick, and the sandbag bunkers, two crooked handles were enough to hold here. Once the enemy attacks with fire, the iron gate on this side is wrapped in asbestos, and there is no fear that it will burn into the back tunnel. Besides, with the help of the mezzanine, it is difficult for the enemy to get close to the iron gate to carry out the blasting.

But the poison gas frightened them, they didn't know if the advance team would use poison gas bombs, but wearing gas masks was still a must.

In the panic, the Japanese army suddenly discovered that this was not poison gas, but tear gas.

You still want us to suffocate?!

After the Japanese army realized that it was not poison gas, they turned their noses up at the tear gas one by one. They have a good ventilation system, where can they suffocate with gas bombs?

At this time, at the front of the position, on the opposite side of that tunnel, from a few tens of meters, rows of fighters lay on the snow until they were a kilometer away.

They all had sapper shovels in their hands, and they were all sniffing in the cold air.

After more than half an hour, a choking smell came out of some stones and tree roots.

"Here!"

"There are ...... here too"

With one shout after another, one exhaust port after another was found, and then all the snow was filled, and the shot was solid, blocking those exhaust ports.

"Report to the captain, thirty-two exhaust ports were found."

Dong Ku smiled when he heard the report.

I can't find your air intake, can't I find the exhaust yet?

"Throw a grenade!!"

"Yes!"

One by one, the soldiers threw grenades into the tunnel, and then the quilts were taken down from the infantry vehicle, and one by one the liquefied gas canisters were also removed from the infantry vehicle in the explosion, and soon the ground was full of patches.

"One for each person!"

Dong Ku calmly ordered.

One by one, the warriors entered the trap ramps, holding the jars and waiting for orders. Here in the main tunnel, the warriors also slid down, waiting for orders in the dark.

"Open the valve and get out of the way!"

The soldiers quickly opened the valve of the liquefied gas tank and drilled out of the tunnel, and the quilts were immediately hidden at the entrance.

"Retreat!"

Dong Ku ordered an evacuation after several smoke bombs were thrown into the tunnel and the hole entrance was blocked.

The soldiers rushed to the infantry vehicle, and without looking, rumbled away under the escort of the tank.

In the tunnel, the liquefied gas canisters were clanging, and the sound of dozens of canisters was also terrifying, but the Japanese army had already blocked the passage with an iron gate and built a position, and they didn't know what the advance army was doing in the dark, but one thing can be confirmed, the guard line they put was not touched by the advance army. It was a thin line of fishing, sticking to the ground, and it was hard to spot. Besides, as long as they dare to turn on the lights, it is possible to see the fishing line, but their bullets are not vegetarian.

They were wearing gas masks, unaware that liquefied gas was coming in the tunnel. Moreover, the liquefied gas is relatively heavy, rolling against the ground, and the new air above the head makes the high-concentration part of the liquefied gas diffuse about half a meter from the ground, and quickly fill the space.

In the dark, the Japanese did not wait for the advance army to attack after a series of explosions. But they won't open the iron gate, and since the tunnel has been blown open, the iron gate is the first line of defense.

The liquefied gas hissed, along the firing ports, along the cracks in the holes drilled into the interlayer, along the large holes in the interlayer that had been blown up, rolling in, and quickly spreading to the end of the passage.

The Japanese waited in the dark for more than ten minutes, and there was no movement of the enemy's attack. They didn't know what the enemy was doing, but they didn't dare to move, they waited in silence, waiting for the enemy to attack, unaware that they were already in the barrel of explosives.

The time bomb is set for 20 minutes, Dong Ku doesn't know where the gas will be in the 20 minutes, but one thing is certain, that is, after the exhaust port is sealed, the air flow still enters, so the discharge will flow along the tunnel to the end, because there is a crack there, and it is connected to the outside world.

Everyone looked at the pit and waited for the outcome of the pit to come. They didn't know how powerful this new blasting method was, or what effect it would have.

Time ticks by. The Japanese soldiers in the tunnel tentatively took off their gas masks, because they felt their breath holding and felt dizzy.

Why does it smell?

The Japanese soldier who took off his gas mask shook his drowsy head in confusion.

Other Japanese soldiers also tentatively took off their gas masks. The smell of methane in their noses made them stunned, and they quickly put on their gas masks.

Dong Ku looked at his watch and waited quietly. He calculated that the area in the tunnel, after these cylinders release all the gas in twenty minutes, the concentration of liquefied gas in the tunnel will exceed 30%, and it will not reach 50, at least the first section can be completely reached. (To be continued......)