The underground is too deep, and now it is nearly 150 meters deep if you don't dig it, but Qiubai feels that this depth is not enough, because he is going to make a large space underground, so it must be deep enough, otherwise after the underground is hollowed out, it will easily cause collapse, which will be a tragedy.

According to Qiubai's idea, at least one thousand meters or so underground, the probability of collapse is close to none, one thousand meters, this is a very terrifying depth, so Qiubai must first get the exit right, at least don't be so difficult when walking.

Ning Ning didn't plan an exit, and when she heard this, she asked, "Then what are you going to make the steel claws dig into?" ”

Qiubai thought for a while and said: "If you want to dig it, dig two exits, one goes straight up and down, you can build an elevator or something in the future, and the other uses a spiral type, just like the type of winding mountain road, build it a little bigger, at least two cars can be lined up in a row." ”

Yang Hui took a breath, this planning is easy, it's OK to talk about it, but she can already imagine the vastness of the project, the vertical depth is a thousand meters, and if it is replaced by the height on the ground, it will be more than 300 floors, to put it mildly, it must be much easier to build more than 300 floors on the ground than underground, this is a thousand meters, the underground temperature is already quite high, if you really want to build it, it is proper to soak in the hot springs.

Ning Ning was not surprised, took out the drawings and looked at them, "If it is one thousand meters, it is estimated that the straight hole will be divided into two or three sections, because the elevator will definitely not be able to go straight to it, so let's divide it into three sections, three hundred meters and one section, and the straight hole cannot be dug here, it is best to be far away from our yard." ”

"Don't dig the straight hole first, dig the spiral hole first, so where to start first?"

"Then start here, based on this hole, form a spiral shape, let me take a look, let's start here." Ning Ning pointed to a point, "Dig in from here, and line up the width of two cars, ten meters is okay?" If it doesn't work, you still need a sidewalk, so dig 15 meters wide, leaving two and a half meters on each side as a sidewalk. ”

"Okay." Qiubai clapped his hands, "Steel Claw, work." ”

The steel claw has been lying on the ground, and when he heard this, he raised his head, and the steel claw has grown a little longer in the past three days, reaching a length of six meters and three, with an average of ten centimeters per day.

"Come here." Qiubai shouted, the steel claw climbed over, Qiubai made a digging motion, the steel claw raised its claw and dug up, the hard rock was like tofu, and it easily scratched it.

Yang Hui saw the power of the steel claw for the first time, his face was surprised, and at the same time a little excited, the more powerful the steel claw, this means that Qiubai's idea can be realized as soon as possible, this is the world's largest underground project, right?

The steel claw has been enlightened, Qiu Bai said that the steel claw almost understands, occasionally does not understand, Qiu Bai plus the gesture after the steel claw can almost understand, the biggest obstacle is gone, so I saw the hole continues to expand, with Qiu Bai's mind to take shape.

"Brother, stop." Orange suddenly shouted.

"What's wrong?" Qiu Bai asked in amazement.

The steel claw has been digging for more than an hour, this guy is full of stamina, and he has no rest, but even so, he has only dug a length of about two hundred meters, but this is normal, because this is underground, and when digging, you must pay attention not only to the width, but also to the height.

"Brother, you let the steel claw dig a spiral-shaped hole, right?"

"yes, what's wrong?" Qiubai has been observing with his divine sense, and he has also let the tea tree look at it together, so there is absolutely nothing wrong with it, and now it is digging upwards.

"I think the spiral is too small."

"Huh?"

Orange scratched her hair: "What do you say, let's put it this way, there is no problem with this hole, the width is fifteen meters, right?" You set the height at 10 meters, right? And then at this height and this slope, do you notice that if you turn around and come back, the road on the top is estimated to be no more than 50 meters thick from the rock here? I think it's very unsafe, because there's no support, you know what I mean? I think it's dangerous anyway, so shouldn't the spiral be bigger and make the rock thicker? ”

"Fifty meters is not enough?" Qiubai asked.

"I don't think it's very reliable anyway, the rock layer is not cement and steel, there will be a gap in the middle, and the width of this road is 15 meters, you can pass two cars, if the vehicle runs down for a long time, because this is underground, the road is not easy to repair, it is really easy to have an accident."

Ning Ning also echoed: "Qiubai, otherwise, you can go around a big circle, lower this slope, take twenty degrees as the scale, and then twenty miles as a circle, so that the rock layer in the middle of the road can be about 100 meters apart, and then pave a few layers of asphalt concrete, so there should be no problem." ”

"Twenty miles a circle, calculated at a depth of one kilometer, at least ten circles, this is two hundred miles, will it be too long?"

The spiral highway is like this, obviously it is one or two kilometers directly up the mountain, but it takes dozens of miles to turn up the mountain, Ning Ning said a little more exaggerated, reaching two hundred miles, but all this is really for safety.

"It's a little longer, but it's definitely safe, I haven't studied this thing much, so everything can only be based on safety, but two hundred miles is indeed a bit long, or else, increase the width of the road by ten meters? This is convenient for driving, and the sidewalk is not removed? Presumably no one walked 200 miles to go underground, right? ”

Yang Hui said: "There must be sidewalks, and if you think the road is long, you can repair some hotels and restaurants on both sides of the road, and gas stations can also be there, if this road is really built, it is definitely a great miracle." ”

"Uh" Qiubai was a little speechless: "I said the mayor of the town, and the gas station of the hotel, can you not think so much about it first, this is two hundred miles, and it is underground, to be honest, I am a little unconfident now, I am really afraid that the claws of the steel claws will be scratched bald and will not be able to scratch two hundred miles." ”

Wang Cheng said: "Two hundred miles long, the width is twenty-five meters, the height is ten meters, how many stones have to be dug out, and this is just the beginning, digging into the ground at least there is a breeding pond that needs steel claws to reclaim, I am now deeply worried about the future of Comrade Steel Claw, will he die young." ”

Steel Claw looked at the crowd and scratched his head with his paws, as if it was very difficult.

Orange Cheng hugged the neck of the steel claw: "Comrade steel claw, don't listen to your brother Wang's nonsense, you are the bravest, you must work hard, sister, I will not treat you badly, I will give you good food every day in the future, and the meat is also very big." ”

A few people were speechless for a moment, even if the steel claw was honest, there was no need to fool around like this.

Because of the discussion, the steel claw dug again, and soon a new problem appeared, and the poplar suddenly told Qiubai that if he dug further, he would dig groundwater, so Qiubai was a little painful, and quickly made the steel claw stop.

Qiubai and Poplar communicated, but what made Qiubai very helpless was that Poplar only knew that there was groundwater in front of him, but he didn't know how big the groundwater was, so Qiubai wanted to make a detour and didn't know how to detour.

Ning Ning and a few people saw Qiubai stop, and thought that Qiubai was tired and wanted to rest, but they didn't look like it again, so they asked, "What's wrong?" ”

"There's water in front, groundwater, so you can't dig it." Qiubai explained.

"How do you know?" Wang Chenghu said suspiciously.

"Well, anyway, I just know, let's discuss what to do, you can't dig forward, you can only take a detour."

Many years later, Qiubai said about this incident with a wry smile: "At first, I thought this matter was very simple, thinking that it was enough to cultivate a pangolin and let it keep digging, but in fact this is simply impossible, there will always be some accidents underground, which will make us anxious." ”

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