At 2:10, the middle section excavation team of the Special Regiment began work.
They continued to dig forward at full speed, and all the excess earth and rocks were stuffed into several passages in the southern section, blocking or reducing sudden attacks from the south.
The entire northern section and the middle section were operated simultaneously, and the southern section also created the illusion of operation.
The first is to distract the enemy's energy and attention, and the second is to cover up the movement of diagonally inserted into the tunnel, paving the way for the next step of "boiling the frog in warm water."
The highest commander of the alliance garrison, division commander Su Lisu, had slept on a simple folding bed for an hour when he felt the vibrations of the surrounding walls increase significantly.
Immediately instruct the staff on duty in the lobby to dial the wired phone and request the Marathon brigade commander and other officers to strengthen patrols and alerts to prevent the enemy from concentrating their offensive.
The entire garrison alliance soldiers took action. After half an hour of tossing, they judged from the sound that the opponent's digging position had not changed. In addition to strengthening the defense duty in the southern section, the rest of the personnel took the time to rest and cope with a possible larger-scale attack during the day.
Diagonally toward the wall of the newly dug tunnel, the thin layer of soil peeled off, and the exposed concrete structure can already be seen.
At this moment, the person with special hearing ability from country y appeared here again.
His erect ears were pressed against the wall, vibrating slightly rhythmically, as if trying to capture the information in the corridor.
After 30 minutes, he finally stopped sensing.
He turned his pale face, nodded weakly, and made an OK gesture with the help of the dim light at the corner 10 meters away.
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In the alley-style tunnel here, there is insufficient oxygen in the air, mixed with a small amount of CO that has penetrated, and excessive mental power consumption, making this superpower user somewhat shaky.
Two full-time protection soldiers quickly stepped forward to put on a chemical protective helmet on him, and then escorted him out of the tunnel.
As soon as the men left, four hand-held drilling machines approached the operation and quickly drilled four large holes.
Two CO high-pressure spray guns aimed at two of the holes and sprayed gas wildly outward.
The remaining two holes are blocked by machine guns, ready to attack any intervening enemies at any time.
About 25 minutes, the interval between the other party's patrols.
Five minutes later, the excavation of the southern and middle sections was temporarily stopped.
The northern section is still vibrating, but the frequency and amplitude have dropped by half, and the number of working machines is estimated to have been reduced by half.
The Union soldiers, who were originally uneasy and unable to sleep, found that there was no movement in the most important southern and middle sections, so they began to fall asleep with peace of mind. The nervousness was too much for them.
In their opinion, the northern section was already ready to give up. Someone was holding on to the connecting channel near the middle section, and the rest of the circular tunnel was basically destroyed or filled. It could last at least 2 days. After waiting for the rescue supplies to be obtained, they could fight face to face.
However, they never dreamed that the connecting passage near the middle section had been dug diagonally by their opponents, and four large holes were drilled out.
At this moment, deadly gas is being sprayed.
The Alliance soldiers who had just patrolled over did not notice that 100 meters behind them, the CO gas was rapidly spreading and permeating, and they followed closely.
At an intersection, one of the 4-person patrol team was very alert and seemed to feel something was wrong. He suddenly illuminated the passage behind him with a light, but found nothing.
"Longhol, do you see anything?"
The team leader stopped, turned around and asked.
"It's nothing. Maybe I'm too nervous and feel very uneasy."
The soldier named Langhol wanted to say something, but he couldn't say it well, so he could only prevaricate.
"We just passed by there and didn't find anything unusual. Don't worry, just keep walking." A companion greeted.
"Okay, I hope it's okay."
Langhol murmured uncertainly and followed them northward.
The road heading north was a dead end. If he gave up on turning around and pursuing it, he would be giving up on his life and embarking on a path of no return.
In 3 minutes, the CO gas reaches the intersection and begins to fill in three directions, like a poisonous snake's letter, licking the delicious food that is about to reach your mouth.
On the other side of the exhaled gas, the tunnel extends to the outermost ring of the northern section, which is a row of camping areas.
Hundreds of Alliance soldiers were snoring heartily, entering their own dreams, having sweet dreams, but they did not notice the colorless and odorless deadly gas quietly entering the nasal cavity.
Langhol's patrol group spent 5 minutes exploring the east section of the northern section of the passage. When he turned around and was about to turn to the west to check out the other section of the passage, he suddenly felt something was wrong and inhaled a small amount of CO gas in his nose.
"It's CO gas, hold your breath and run!"
Langhol suddenly woke up and knew that his previous warning was correct. It was this damn gas that had invaded the passage.
"Run quickly, warn me!"
The team leader also reacted and ran back desperately, yelling.
"CO gas, CO gas!"
The remaining two people ran and shouted at the same time, trying to alert the other two groups of patrol officers.
It is 200 meters away from the crossroads. It usually takes less than a minute, but it seems so far away at this time.
The four people ran desperately, but their bodies began to weaken. The more they breathed, the more uncomfortable they became, and their speed became slower.
In one minute, the four people used all their strength to reach the intersection.
Due to severe hypoxia, my heart beat faster, my body refused to obey orders, it was difficult to move my feet, I felt dizzy, and my consciousness was somewhat blurred.
The four of them felt desperate. After holding on for more than ten meters, they could no longer recover and collapsed to the ground.
"Help!"
His mouth was open, and his voice was stuck in his throat, unable to come out.
Even if someone knew about it, they would not dare to come to the rescue because the corridor is filled with a lot of CO gas. Once it continues to be inhaled into the heart and lungs, it will be difficult to escape.
The four people began to vomit violently, their bodies twitched involuntarily, their faces turned from pale to flushed, their hands and feet waved around helplessly, and their brains gradually lost consciousness.
Boom! Boom! Boom!
Langhol took advantage of his last lucidity and fired the submachine gun in his hand, hoping to use the sound of gunshots to remind other comrades to escape from this devilish area.
The sound of gunfire alerted another group of soldiers who were patrolling here, and the four of them rushed here quickly with guns in hand.
As soon as I approached a fork, I smelled CO gas. I didn't dare to rush forward anymore, but turned to the nearest alloy gate, hoping to alert the gatekeepers to stop the spread.
This was the first thing to do in the emergency plan. There was nothing wrong with their move. By the time they arrived at the gate, the alloy door had already been closed.
Just as a few people were about to knock on the door, they saw a dozen companions putting on wet masks or wet towels and filing out towards the barracks area. This was the rhythm of going to rescue people.
After such a delay, the CO gas in the aisle became even stronger. When several people saw that there was already action here, they immediately turned around and ran towards the passage they came from. They must notify the people behind to prepare as soon as possible to prevent the loss from expanding.
The CO gas was mixed into the barracks for 5 minutes. Although the oxygen concentrator was working continuously, the two gases blended together without distinguishing each other and were sucked into the heart and lungs of the sleepers at the same time.
In just a short while, even after hearing the gunshot warning, most of the soldiers fell into a state of unconsciousness, and the heavy feeling of fatigue made them not want to open their eyes.
However, the difficulty in breathing stimulated the body to wake up as soon as possible. After struggling, it was found that the whole body was weak and it was difficult to move.
Many people, who are physically strong, rolled out of bed and crawled toward the door, hoping to get close to the oxygen concentrator and breathe enough oxygen. The first batch of rescuers came in and felt bad when they saw this scene. Scanning the entire barracks, they only heard the sound of gasping for air and the occasional brief life-saving cry.
Without any time to waste, they temporarily left behind the dozen or so weak people gathered around the oxygen concentrator, quickly rushed to the still moving soldiers, hugged them without saying anything, and ran out.
The second batch of rescuers who arrived, including four soldiers with guns, searched along the channel in the direction of the enemy-occupied tunnel, intending to find the source of the gas eruption and prevent the spread from the source.
Digging the newly dug tunnel diagonally, Country Y's two CO high-pressure spray guns continued to spray jets outward from the two holes.
When I heard the footsteps of someone approaching the two holes blocked by the machine gun, I immediately fired intermittently to prevent the intruders from blocking the nozzle of the jet gun and losing the hard-won opportunity.
boom! boom! boom!
Seeing that they could not get close enough to use it, the four Alliance soldiers had no choice but to throw a few grenades over, hoping to blow up this tunnel and stop the spread of gas.
However, they forgot that the tunnel walls could barely block the direct penetration of heavy drilling D-bombs. The power of this grenade could not move much at all. It only peeled off a lot of the soil layer in the middle and could not achieve the expected effect.
Unless special blasting explosives are used, this tunnel will be destroyed only after a certain amount of explosives has been accumulated.
The leader made a gesture, and the four Union soldiers quickly left to report.
Ten minutes later, four bundles of remote-controlled blasting explosives were piled up using two CO high-pressure spray guns as the source points. Several piles of explosives were scattered in the gas-filled corridors on both sides. It was obvious that they had no choice but to completely abandon the northern section of the passage.
20 minutes later, the dozen soldiers who were last staying next to the oxygen concentrator were rescued, and the rescue operation officially ended.
The more than 160 companions left behind were no longer breathing. It was a waste of effort to rescue them. It would be best to just let them sleep here.
There are also alloy doors that come in and out frequently. Even if an oxygen generator blows air outwards, it cannot stop the slow penetration of CO gas of the same quality.
25 minutes later, all weapons, oxygen concentrators, living supplies and other useful items in the barracks were removed, and several oxygen bags were placed on the gas source point blasting explosives.
After 28 minutes, all living Alliance soldiers exited the northern ring area and entered the alloy gate of the middle tunnel.
The remote-controlled detonator pressed the detonator through the crack in the door. After hearing the violent explosion, he quickly unplugged the connecting cable and threw it out the door. The guards quickly closed the door before the line of fire came.
boom! boom! boom!
Chain explosions continued, and the powerful airflow shook the alloy door repeatedly, making it feel like it was about to be pushed down.
The guards waited until the peak period passed and the gate was still intact, and then the tension in their hearts relaxed.
The newly dug tunnel was dug diagonally, and the two CO high-pressure spray guns on the wall separating the explosion channel and the machine gun blocking the two holes were not spared this time.
The entire concrete wall collapsed inward, crushing the nearest firearm, and four special forces soldiers were buried under the cracked wall.
A dozen defensive soldiers who were a little further away were affected by the impact of the airflow and gravel, and suffered multiple minor injuries all over their bodies, but they were not serious.
However, the solid concentrate exposed after being crushed by two CO high-pressure spray guns was ignited by the explosion flames, causing a secondary explosion in an instant.
The violent bursts of steel and gravel took a dozen of the defense soldiers who had just calmed down as targets, and swarmed into them violently, killing and injuring most of them.
Fortunately, the air in this passage was relatively normal, and the air flow rushed forward for a certain distance without triggering a chain reaction. It was considered a lucky escape.
At the cost of less than 20 casualties, Country Y's special forces finally took control of all the passages in the northern section.
It's just that it will take a lot of time to open up the entire northern section.
