"Hello chief, Wu Kui, commander of the engineer battalion of the regiment directly under the XX Army in the XX Theater, reports to you."

Tang Rui's car came to the cave, and the commander of the engineer battalion who was sent to assist in the work reported to Tang Rui as soon as possible.

"Battalion Commander Wu, hello, I'll trouble you next." Tang Rui said politely.

"Please instruct the chief."

"No hurry, let's take a look first."

Tang Rui took Battalion Commander Wu and Sister Zhao into the cave under the protection of the special service team.

The whole cave looks like a funnel.

On the downward spiral road, there are several small platforms for people, and there are passages of various sizes behind the platforms.

And at the very bottom of the funnel, there is an underground river.

The passage between the surface and the surface, just below the bed of the underground river, has a fifteen-meter-thick rock formation in the middle.

"The structure of the entire cave, Camp Commander Wu has it, right?"

"Report chief, yes."

"Battalion Commander Wu, look here, here, and here, you need to use explosives to blow up all the rock walls on this side."

Tang Rui pointed to the rock wall that was wide at the top and narrow at the bottom, and said to Camp Commander Wu.

Hearing his request, let alone Battalion Commander Wu, even the special service officers around him were stunned.

Blowing up a rock wall?

It is 20 meters deep from top to bottom, and even if the thickness is calculated according to the width of the top, the thickness of the rock wall that needs to be blasted at the bottom is more than 12 meters.

It's not a lot of work, but the problem is that it can't be blown up at all.

"Chief, you need to drill to blast the rock wall, and the thickness of the rock wall below is so thick that even if you drill and fill the explosives, you can't blow it up."

Battalion Commander Wu made a simple calculation and said the result.

Tang Rui nodded after listening, of course he knew that he would definitely not be able to blow up this rock wall just by drilling and filling explosives.

But science can't work, magic can't do it?

"You're right, but that's under normal circumstances, what if the rock wall turns out like this?"

After Tang Rui finished speaking, he took out a scroll from his arms.

Open the scroll and the magic circle activates.

【Fossils are mud】

This is a magic scroll specially made by Tang Rui, just for today's project.

He acknowledged that the country's infrastructure is strong.

But technology combined with magic is double the joy.

[Fossil to Mud] and [Turning Mud to Stone], two types of magic transformed from divine arts, are the supporting legendary spells of the infrastructure.

The attack power of these two types of magic is not very good, but when it is used for infrastructure, it is at the legendary level.

As the magic scroll activated, the hard stone on the rock wall instantly turned into soft piapia earth.

"Hard, slam it up." Tang Rui said to Camp Commander Wu.

Goo!

Battalion Commander Wu swallowed a mouthful of saliva and hammered his fist on the rock wall.

He's already figured it out and will go to the doctor.

As a result, his arm slammed directly into the rock wall.

Due to the force of the squeezing, the muddy rock wall was also sprayed with the body of Camp Commander Wu.

This!

Battalion Commander Wu was dumbfounded, and the members of the special service team were also dumbfounded.

Sister Zhao was alone, although she was surprised, but she didn't show a look of bewilderment.

I should have told her above, so I have resistance.

"If the rock wall becomes like this, can it be blown open in one go?" Tang Rui ignored everyone's confusion and asked directly.

"Report to the chief, there is no problem." Camp Commander Wu replied loudly.

"Very well, then go ahead and prepare."

The group returned to the entrance of the cave, and Tang Rui asked people to bring out all the magic scrolls copied from the Book of Ten Thousand Laws last night.

On the other side, Battalion Commander Wu led technicians and began to calculate the location of the boreholes in the rock wall.

Although the requirements for fixed-point blasting are not so high to blow up the muddy rock wall, it is also necessary to calculate the entire rock wall at one time.

Two hours later.

The soldiers of the sapper battalion, according to the order, took the magic scroll, went to their designated position, and opened the magic scroll.

When the mud melted into the rock wall, the soldiers filled the rock wall with the explosives that had been prepared for a long time.

"One shift to complete the task."

"The second shift is complete."

"Three shifts to complete the task."

Battalion Commander Wu was in the tent, and after listening to the reports of each squad and platoon, he drew a cross in the position that each squad and platoon was responsible for.

Soon, the drawings were full of crosses.

Battalion Commander Wu put down his pen and checked the equipment again before picking up the walkie-talkie and giving everyone the order to evacuate.

A kilometer away, Battalion Commander Wu came to Tang Rui's place and reported to him.

"Report to the chief, the explosives are in the landfill and ready for blasting."

"Check again, there is no safety hazard, just detonate."

"Yes, guaranteed to complete the mission."

Twenty minutes later.

A series of roars rang out.

Tang Rui felt the tremor on the ground a kilometer away, although the amplitude was not very large.

"Let's go, go over and see what happens."

"Yes."

Two off-road vehicles drove the road, two off-road vehicles pushed back, Tang Rui's Hongqi coupe ran in the middle, and the five cars quickly came to the vicinity of the entrance of the cave.

When Tang Rui got out of the car, he saw muddy rock walls splashing everywhere around.

Above the entrance to the cave, the muddy rock wall that had been blown to the top was dripping down like rain, which looked disgusting.

"Report to the chief, the task of blasting the rock wall has been completed, the predetermined planned blasting intensity has been reached, and there are no casualties and property damage."

After Battalion Commander Wu saw Tang Rui, he ran over to report.

"It's hard work, but the mission is not over yet, do you bring weapons?" Tang Rui looked at the bottom of the cave and smacked his lips and said.

"Weapons? Is it OK to have a sapper shovel? Camp Commander Wu was stunned for a moment and replied.

Tang Rui looked at Camp Commander Wu, and he wanted to say yes.

But for the sake of the lives of the soldiers, he could only shake his head.

The explosion just now attracted the life underground, although it was a group of kobolds.

But Tang Rui remembered that near this passage, there was a large underground space, and inside it was a city ruled by drow elves.

It is estimated that it will not be long before the drow elves who rule the city will send someone to check on the situation.

Therefore, after he opens this passage, he still needs to be ready for battle.

"Gatling, bazookas, close-in guns, recoilless guns, are there any of these things?" Tang Rui asked.

"Report chief, we are an engineer battalion." Camp Commander Wu was very aggrieved.

Bullies don't bring anything like that.

We're just an engineer battalion, and you told us we want recoilless guns, and if we have that, would we still be an engineer battalion?

"Okay, Sister Zhao, contact the above, hurry up and send troops over, bring your weapons and prepare enough ammunition."

"Speaker, where are our enemies? How many people are there? What is the configuration of the enemy's weapons? Sister Zhao asked.

"Below, there is life underground, at least 50,000 people."

"Underground passage down here?"

Sister Zhao was stunned, although she didn't know what Tang Rui was doing before, she didn't care at all.

But not anymore.

If there was a passage below to connect to the underworld, she would have to take Tang Rui away.

An hour later.

Tang Rui was in the temporary command center in the city, watching the layout of the defense line around the cave through video.

The mountainous area where the cave is located is completely cordoned off.

The tanks were placed a kilometer outside the entrance of the cave, and the muzzles of the guns were all pointed at the cave.

There are helicopter gunships in the sky, a line of armored vehicles on the ground, artillery and missile units in the rear.

"Speaker Tang, do you think this firepower is enough?"

"Is there a cloudburst bomb? Wait a minute, throw one in. ”

"Medium!"