After sending Mr. Zhu away, Yue Weihan picked up the progress of the Niangziguan Fortress project by the way.

The amount of work of Niangziguan Fortress is slightly smaller than that of Tumen Fortress, and there are only seven Zimu Fortress Groups, but after completion, its defensive strength will not be much inferior to that of Tumen Fortress.

Then, Yue Weihan inspected the "industrial zone" of Cangyan Mountain non-stop.

Cangyan Mountain Industrial Zone is the core of the entire Taihang base and the essence!

The planned Cangyanshan Industrial Zone will house four "large" factories, a 3,000-kilowatt thermal power plant, a 10,000-tonne-per-year steel plant, an arsenal and a gunpowder factory.

The equipment is ready-made, and the thermal power plant and the steel plant are said to have been "sent" by myself.

The arsenal and gunpowder factory were the Taiyuan arsenal that completely relocated Yan Xishan.

The site had already been chosen, and the arsenal and gunpowder factory were relatively easy to conceal and therefore built in the dense forests of the valley, while the thermal power plant and the steel plant were built at the bottom of a cliff because of their towering chimneys, and the buildings of the two factories had to be carved out of the cliff according to the plan.

In charge of the construction of the Cangyanshan Industrial Zone were 5,000 prisoners of war.

After two months of hard work by the 5,000 troops, the plant buildings of the arsenal and the gunpowder factory have been basically erected, and most of the equipment has been installed and debugged, and as long as the workers and raw materials are in place, they can immediately start production.

However, the construction of thermal power plants and steel plants did not go well.

The reason is simple, the amount of work to dig out the factory from the bottom of the cliff is too large!

Pi Xiaocheng, who accompanied Yue Weihan to inspect, suggested: "Commander-in-Chief Yue, the amount of work to dig out two factories under the cliff is too large, and at this pace, it may not be possible to complete the project in a year. ”

"Oh?" Yue Weihan hurriedly said, "Say it quickly." ”

Pi Xiaocheng said: "It's better to find two dirt mountains, like Tumen Fortress and Niangzi Pass, dig the belly of the mountain, that space is enough to build two factories, and the amount of work is far smaller than digging cliffs, and then use steel bars, ash and logs to reinforce, even if the army knows where our power plant and steel plant are built, there will be no way." ”

After saying this, Pi Xiaocheng said: "Of course, for the sake of insurance, it is best to bend the chimneys of the power plant and the steel plant, and stagger the location of the smoke exhaust from the factory building, so that even if the military bombers find and blow up the chimney, we can repair it quickly, but the plant facilities can be unscathed." ”

"Good!" Yue Weihan said happily, "Pi Xiaocheng, from now on, you are the chief engineer of the four major factories, at this stage your task is to supervise the construction of the four major factories, after the completion of the factory, equipment maintenance, technical improvement, process improvement and so on all technology-related issues are entrusted to you to be responsible!" ”

Yue Weihan's letter of appointment was not appointed casually with a hot brain.

Although Pi Xiaocheng is from the occupied area and is from a Han family, he himself is definitely a patriotic young man, and his love for the motherland is absolutely from the heart.

The most important thing is that Pi Xiaocheng is also a doctor of electromechanical and chemical engineering!

There are also a few experts sent by the national political axe who study mechanical and electrical, but the level is much worse than Pi Xiaocheng, so the chief engineer of the four major factories can only be Pi Xiaocheng.

"This ......," Pi Xiaocheng said busily, "Commander-in-Chief Yue, I'm afraid it's hard to do it." ”

"I believe in you." Yue Weihan patted Pi Xiaocheng on the shoulder and said, "You will definitely be able to do it!" ”

Pi Xiaocheng was silent, but he was not without emotion in his heart, thinking that he was a "second devil" from the occupied area, but Yue Weihan dared to entrust him with the important task of the logistics steward of the group army.

Before leaving the Cangyanshan Industrial Zone, Yue Weihan made a special tour of the prisoner of war camp.

In order to ensure that there are no accidents such as prisoners of war escaping, a full regiment of garrisons was stationed in the Cangyan Mountain prisoner of war concentration camp, and three blockade trenches were dug around the entire industrial area, and a guard post was set up every 100 meters, and there were patrols regularly patrolling every half hour.

However, Yue Weihan was still not at ease, and called the head of the Cangyan Mountain Garrison Regiment in front of him.

The head of the Cangyan Mountain Garrison Regiment is Zhao Baihu, and this guy was the owner of the Lunan White Tiger Gate before he voted [***].

"Headquarters!" Zhao Baihu ran to Yue Weihan, saluted the military salute in style, and said loudly, "Zhao Baihu, the head of the Cangyan Mountain Garrison Regiment, reports to you, please instruct!" ”

Yue Weihan returned the salute and said solemnly: "Commander Zhao, how many prisoners of war escaped this month?" ”

"Escape?" Zhao Baihu said confusedly, "General seat, since the Cangyan Mountain Prisoner of War Concentration Camp was built, a total of more than 5,000 devil prisoners of war have been held, after more than two months of high-intensity labor, about 900 devil prisoners of war died of exhaustion, and more than 100 devil prisoners of war starved to death, but none of them escaped?" ”

"It's good if you don't have it." Yue Weihan snorted, he originally deceived Zhao Baihu.

After saying this, Yue Weihan said again: "Zhao Baihu, Cangyanshan Industry has concentrated the four most important factories, namely thermal power plants, steel plants, arsenals and gunpowder factories, for the 39th Group Army, I believe that her important surname does not need me to say more, so your garrison regiment must do the security work to the extreme to ensure that there is no mistake!" ”

Yue Weihan's words were not said casually, and the secrecy work of Cangyanshan Industrial Zone was indeed very important.

Imagine that as long as one or two of the prisoners of war held here escape, it is possible to report the detailed situation here to the headquarters of the Central China Front according to their memories, and the Chinese army will be able to quickly dispatch bomber groups to bomb them.

Yue Weihan only had this batch of equipment in his hand, and if it was blown up, he wouldn't be able to find a place to buy it!

As long as there is a mistake in one of the four factories of thermal power plants, iron and steel plants, arsenals, and gunpowder factories, Yue Weihan's abacus will completely come to naught, and at that time, even if the entire Jingcheng Grand Canyon is built into a Maginot Line, it will still not be able to stop the advance of the Yue army, and there must be ammunition to defend the fortress, right?

"Don't worry, Mr. Chief!" Zhao Baihu said confidently, "The entire Cangyan Mountain Industrial Zone is a big iron bucket, not even a mouse can escape, if the devil prisoners of war want to get out from here, there is only one way, when they are tired or starved to death, they can float back to Dongyang Island in the form of a soul, hehe!" ”

Yue Weihan said: "Okay, it's good to have confidence, but don't be careless." ”

"Yes!" Zhao Baihu snapped upright and said loudly, "The humble post must be a hundred thousand points of spirit!" ”

At that moment, Yue Weihan left the Cangyan Mountain Industrial Zone, and then rushed to the Tumen Fortress by car non-stop.

In the morning, Liu Yi called, saying that the first phase of the Tumen Fortress had been basically completed, and when Yue Weihan wanted to take a car to inspect, he ushered in Mr. Zhu.

Before he could rest, Yue Weihan climbed Conch Mountain accompanied by Liu Yi and Mao Yisheng and other experts.

Still a few dozen meters away, Yue Weihan found that the original top of Conch Mountain had been completely flattened and replaced by a large pillbox with a diameter of 50 meters!

From the outside, the bunker is more than six meters high, but inside it is only two meters high.

Mao Yisheng introduced as he walked: "Commander-in-Chief Yue, the main bunker of Conch Mountain is designed to be 50 meters in diameter and 5 meters thick, from the outside to the inside, there is a one-meter-thick reinforced concrete exterior wall, three layers of 3mm thick steel plates are implanted in the middle, and then a three-meter-thick cavity is built-in, with sandbags filled with yellow sand, and then a layer of one-meter-thick reinforced concrete inner wall. ”

"Why is it designed like that?" Yue Weihan looked at it, this wall was really thick enough, and the shooting holes looked like tunnels.

"It's designed to be shockproof!" Mao Yisheng said, "An expert in explosives has told me in the past that when a heavy bomb or a large-caliber grenade explodes, it will produce a huge shock wave, and if the shock wave cannot be effectively weakened, the personnel hiding in the bunker may be killed or injured." ”

"And what about the top floor?" Yue Weihan said, "It looks very tall on the outside, but it's very short on the inside." ”

Mao Yisheng nodded and said: "The top-level design is like this, first it is a one-meter-thick reinforced concrete dome, covered with logs with a diameter of about 50 centimeters, the first layer is arranged horizontally, the second layer is arranged vertically, the third layer is horizontally arranged, and the fourth layer is arranged vertically. ”

As soon as he finished speaking, Yue Weihan and the others had already walked to the crossing of the bunker to the second basement floor.

Mao Yisheng said: "The bunker has a total of four layers of structure, the surface is the shooting position, the second underground floor is the arsenal, the third underground floor is the living lounge for officers and soldiers, and the fourth underground floor is the field hospital. ”

"Good, good." Yue Weihan nodded happily, and bent down into the passage leading to the second underground floor.

Through a diagonal staircase about ten meters long, Yue Weihan and his party went down to the second floor underground.

The ventilation of the second basement is good, people do not feel stuffy at all when they enter it, the power supply system has been connected, the snow-bright searchlight illuminates the whole space as bright as day, because the bunker has just been built, the weapons and ammunition have not had time to enter, so the whole space seems empty, but it will not be long before it will be filled with a large number of weapons and ammunition!

Seeing this, Yue Weihan was already relieved, and he didn't even need to look at the third and fourth floors of the basement anymore.

Such a fortress can definitely be described as impregnable, as long as sufficient ammunition and daily necessities are guaranteed, the strength of a regiment is enough to hold out for a year, if the army wants to break through such a fortress, it is absolutely impossible not to pay more than ten times the cost of casualties!

(To be continued)