When He Tao and his son were having a dispute over the trial on site or watching live TV, the newly built Tamengye Military Research Institute was undergoing rigorous testing of improved replacement parts, armor and electronic equipment delivered by various units.

The Military Research Institute's Bita Mengye Training Base is even deeper into the mountainous areas full of primeval forests, and crosses northeastwards a saddle-shaped low mountain range, located within a five-kilometer-long valley.

On both sides of it, there is a mountain.

The mountains on both sides are not particularly high in absolute height, and the peaks are only four or five hundred meters, but they are very steep and the mountain is very wide.

The mountains on the west side are northeast and southwest, and more than ten kilometers westward are continuous mountains, reaching the plains between Guijiamujie. The mountains on the east side are trapezoidal, located in the northern section of the valley at the end of the valley, about seven or eight kilometers. The mountains at the entrance of the valley are relatively thick, up to ten kilometers. After crossing this mountain, it is the frontier city of Maika, which confronted the base area with the army.

The Military Research Institute is surrounded by mountains and primeval forests, and there is only one passage that leads to Tameng's southwest.

Here, the confidentiality and anti-espionage effect is excellent. It is centered on the valley and the surrounding mountains are crisscrossing. It is just right to dig a mountain and dig holes, hiding a large number of important military enterprises and research institutions in the belly of the mountain. There is a mountain protection above and there are original forests covering the detection and observation from the top of the head. Even if enemy planes come to bomb, it is difficult to cause serious blows to it. This further strengthens the security of this military research and manufacturing base.

Guan Fei and the base area and the domestic expert group did not appear on the way. There were long mountains on both sides of the road, high and low hills.

Looking from the car, there are tall and straight primeval forests everywhere. Large areas of broad-leaved forests pave the green of their sight. The nearest woods are only a few meters away from the road. When you sit in the car, you can see the messy shrubs, vines, and countless unknown small flowers growing inside through the dark and deep trees.

"When we infiltrated the enemy's backbone, we passed through this valley and rested here for a night." The driver participated in the anti-encirclement and suppression operation. While driving the car, he was telling them how they passed through the primeval forest and penetrated the enemy's backbone, and pointed to the vague fluorescence in the forest, indicating that it was the light paint they sprayed on the tree trunks in order to guide the troops forward.

The experts on the car looked in the direction of his fingers and could only see a little bit of hidden light through the hidden trunks and branches and leaves, and did not know whether what he said was true or false. However, no one had actual field marching and combat experience, so he naturally listened with relish, nodding repeatedly and marveling.

The road is winding, and because of the saddle-shaped mountain, it first goes north and bypasses the small mountain, then turns southeast, goes three or four kilometers, and finally turns north and enters the valley entrance.

This valley is still very wide. The mountain is relatively gentle at the entrance, about six or seven hundred meters wide. Looking ahead, the narrowest place is about two or three hundred meters, and the terrain is very wide. The soil in the valley is washed down from the mountains on both sides and accumulated over the years. The ground is very flat. As long as the drainage work is done, it is a good place to establish a town.

However, the soil here is very poor, and it is all red soil without organic matter.

From here, there is no trace of people, nor houses and fields. This is indeed a barren land and no human settlements are settled.

As soon as the convoy turned over a foot of the mountain, he heard the continuous sound of firecrackers in front of him. The loud sound passed by the valley, and it was stacked and many times, and it was rolling, like a muffled thunder.

"Don't be nervous, this is a cave that is blowing up mountains and digging caves for future military industry entry." He stood in the aisle with the car and comforted him.

The experts in the base area have never done military industry before, and perhaps they are not used to it. These experts in China are old military industry, so they are naturally not unfamiliar with this. Not only are they not frightened, they come to the window to look outside.

I saw that there were engineers wearing blue canvas work clothes everywhere in the winding valley. It was estimated that there were only two or three thousand people. They divided into dozens of teams, making holes between the left and right mountain walls, and then used excavators and forklifts to dig out the broken stones, then dispatched a drill rig with drill bits to peel off the loose rocks around them, expanding the exploded hole.

When the drill bit is no longer exposed to loose stones, the drilling rig no longer digs slowly, but retreats, and the engineer goes forward and digs holes and places blasting objects again to perform the next directional blasting.

Through continuous blasting and the assistance of various engineering equipment, the opening was quickly expanded to ten meters square, and then quickly extended deeper.

"We have been digging here since the beginning of the year, and have dug out more than 20 large caves with a width of two meters and a height of ten meters. These caves are digging straight forward, about 200 meters deep into the abdomen of the mountain, and then digging a main road horizontally. Then, using this main road, we continue to dig caves into the abdomen of the mountain, as workshops, dormitories, warehouses, research institutes and other living and working places. On these main roads, there are also many branch roads to be excavated, which are used to go up, down, left and right." The accompanying staff stood behind the driver and introduced to the experts.

Domestic experts smiled and nodded slightly.

Digging tunnels is not unfamiliar to China and is commonplace.

Faced with the threat of the giant bear in the north, there are many holes in China. Where there are mountains, where there are mountains, and where there are no mountains, they need to be dug. In the mountains southwest of the country, not to mention tunnels that range from several kilometers to several tens of kilometers or hundreds of kilometers are not uncommon.

"Dig deep holes, accumulate grain, prepare for wars, fight big wars, and fight nuclear wars!"

Such propaganda slogans have been shouted a few years ago, and anyone who has come from that era is familiar with them. Whenever the situation is tense, some more critical experts have suddenly been called out by security personnel from their jobs and didn't even have time to get their clothes to change, so they hurried to the airport, station to meet, take a plane, and go straight to the hidden hiding point in the mountains, and more than once.

Although I have done less of this now, the domestic vigilance towards the north has not relaxed at all.

The mountain project built in the base area is just a domestic replica, but it is just a smaller scale.

Looking out from the car windows, they can easily distinguish the dense small holes on the mountain walls, which are the air permeable holes in the tunnel group, which are the skylights, and which are the emergency escape doors. From the layout and construction methods of these tunnels, it can be seen that they have received technical guidance from domestic engineers.

The deeper you go, the higher the completion rate of the excavated cave, and the sound of blasting gradually becomes smaller.

"We started to repair the construction from Tani O, and arranged the defense system, so that we can put more sensitive projects in the safest area." The accompanying staff explained.

The convoy finally stopped at the end of the valley.

It is said that it is the end of the valley, but in fact there is a smaller valley path that extends forward windingly and does not know where to lead.

"There are many small valleys passing through there, and we have set them up as outdoor testing grounds. Some artillery experiments or relatively dangerous experimental projects are carried out in those small valleys to ensure safety, and no major casualties will be caused if an accident occurs." The accompanying staff explained when they saw their eyes.

It turned out to be an outdoor test site.

The experts nodded. They could see soldiers hiding in the surrounding hills and valleys. These were not engineers wearing blue work clothes, but soldiers wearing digital camouflage, complete helmets and bulletproof vests, and live ammunition. They were scattered in groups of three or three in the outposts at the commanding heights of the surrounding hills, and they could also see two teams of sentries carrying military dogs patrolling the ridge.

In the dense forest on the mountain, there is occasionally metal reflection. If you look closely, you can see the iconic trumpet-shaped muzzle of an anti-aircraft cannon facing the sky.

That is an air defense position.

Safe, very safe!

The experts looked around a little, and in order to avoid suspicion, they stopped looking at it.

The convoy was parked in front of a large cave on the left.

The cave is twenty meters wide and ten meters high. Not to mention that ordinary vehicles can enter and exit, even shooting vehicles loaded with special equipment can easily enter and exit quickly.

The entrance of the cave was re-applied with cement, but there was another layer of Chu red color like the surrounding mountains outside as camouflage. A large tree with lush branches and leaves was specially transplanted on the slope above the cave. The branches and leaves growing from the trunks were blocked like a large umbrella to prevent targets from being discovered by air reconnaissance.

At this moment, two huge steel doors sealed the entrance tightly without leaving any gaps.

The door of the second jeep opened, Guan Fei got out of the car, walked to the door, lifted up a thick steel shell, and entered a line of numbers on the password disk above.

Above the cave, a photographic probe moved, turned left and right, scanned the convoy forward and back, and then reset.

A few seconds later, a rumbling sound seemed to come from the underground.

The two steel doors slowly retreated to both sides, revealing the passage.

Guan Fei returned to the car, the car in front started and slowly drove into the cave, and the cars behind entered one after another.

When the last car passed, the steel door rumbling again and closed again.

"This is at least two meters thick, and from the cross-section, it is not just pure steel, but also ceramic plates, glass fiber and other things are sandwiched in the middle. This is simply thick composite armor!"

"How high penetration is this required to penetrate it!"

The experts were quietly discussing, but this time the People's Army accompanied him did not introduce him, but just smiled without saying a word.

After the bus that the experts were riding through the gate, the passage inside was very wide, and two rows of incandescent lamps were installed on the top, which illuminated the passage as bright as daytime. The car did not feel dark and narrow when driving in. And on the mountain walls on both sides, they found several holes like shooting holes, revealing the muzzles of several machine guns. The muzzles were slowly turning with the convoy, and it can be judged that someone was operating behind them. If the enemy came in, they might have been baptized by bullet rains from high places on both sides.

The convoy traveled about fifty meters and was stopped by the second steel gate.

It was also Guan Fei got out of the car, opened the heavy steel shell on the panel, and entered the password, but this time he also verified his fingerprint, pupil, and the second steel gate opened.

"Good guy, with these two steel gates, even nuclear bombs cannot be opened!" An expert laughed.

Several experts who have been to the third-tier confidentiality unit in the car smiled and said nothing.

What are two steel gates? I have seen three or even more!

Some more important national defense tunnels are even equipped with multi-layer steel plates on the top for reinforcement. Not to mention that ordinary aerial bombing is powerless, even if it is bombed with nuclear bombs, it cannot be opened.
Chapter completed!