After arranging Heiyanwei, Shang Tianji swept his mind and found that many grass and wood elves who were cultivating in the Spirit Sea Realm were guarding Heiyun Mountain at this time, nodded slightly, and then a horizontal sky landed in front of an inconspicuous cave at the foot of Heiyun Mountain.

"Little Linglong, the underground base is well built. ”

Shang Tianji walked down the stone stairs behind the entrance of the cave, and all the inside of the cave was reinforced with reinforced concrete, and even he faintly sensed the existence of a certain formation aura, and then said with a smile on his face.

"Of course, the underground base is the nest of our Science and Technology Research Institute in the Jiuding Ancient Realm, naturally it is necessary to build it well, after the special design of Xiao Linglong and Bai Lao, and finally built with thick reinforced concrete outside the underground base, inside is the Demon Sealing Array under the Demon Sealing Tablet that we got in Zhenhu City, as long as it is not an extremely powerful monk and demon beast, in terms of safety, there is absolutely no problem. Xiao Linglong sat on Shang Tianji's shoulder, swaying her little short legs, and said a little proudly.

With the footsteps down, gradually Shang Tianji also heard the roar of the machine, when Shang Tianji's footsteps completely stepped out of the stone stairs, the scene in the cave also completely fell into Shang Tianji's eyes.

into the eyes.

It is an underground cave that covers an area of I don't know how many acres, and there are modern industrial production lines and research laboratories in the cave, as well as many busy plant and tree elves.

"Boy Shang, how about it, our underground industrial base is okay. At this time, Bai Lao walked out of nowhere, came to Shang Tianji, and said with a smile on his face.

"It's not just good, this is simply beyond my imagination, I didn't expect that in just three years, you have not only built such a large underground base, but even the basic shelves of industry have been built. Shang Tianji said with a smile.

"The fact that such an underground hole was dug in such a short period of time is the work of the rock-breaking pangolins, and as for the industrial shelves, it is also thanks to the large amount of infrastructure that we have brought from the earth. "Bai Lao didn't take credit.

While speaking, Bai Lao took Shang Tianji to visit the underground base, and while walking around, he explained the basic situation of the underground base to Shang Tianji in detail.

Next, under Bai Lao's explanation, Shang Tianji also gradually learned about the changes in the Institute of Science and Technology.

First of all, there are all kinds of infrastructure brought from the earth, and in addition to some mines that Bai Lao found in the beast domain, some of the more powerful weapons on the earth have already begun to be produced in the underground foundation.

In addition to the various weapons that were already on the earth, the Science and Technology Research Institute has also been developing new weapons in the past three years, and it is already close to success.

In addition to weapons, there are various basic measures in the underground base, and the things that can be produced on the earth, as long as they are needed by the business and heavenly machines, are almost all made.

More importantly, in the past three years, artificial intelligence has been developed by Bai Lao, and with the help of artificial intelligence, they can ignore the means of communication hindered by various formations.

Finally, in the past three years, in order to quickly and safely transport all kinds of ores collected in various mines in the Beast Domain, as well as the needs of the Shadow Guard, with the help of the Rock Breaking Pangolin, several underground passages have been opened in the underground of the Beast Domain, and more passages are already in Bai Lao's design.

"Okay, Shang boy, that's the basic situation of our underground base, do you have any questions, if not, I won't accompany you kid. A few hours later, after taking Shang Tianji to basically walk around the underground base, he said with a smile.

"If you have something to do with the old man, you don't have to accompany me, I'll just see for myself. Shang Tianji said with a smile.

"Okay, you kid just take your time, I'll go first. Bai Lao was not polite to Shang Tianji, and after a simple word, he raised his feet and walked towards one of the many research laboratories in the underground base.

After Bai Lao left, Shang Tianji didn't stay in the underground base for long, and after a few more simple glances, he raised his feet and walked to the exit of the base.

Half a month later.

Shang Tianji took the 1,000 Black Flame Grass Spirits led by Black Flame and stationed on Black Cloud Mountain, as well as 4,000 Black Flame Grass Spirits that later turned into spirits, a total of 5,000 Black Flame Guards, and walked down the underground base again.

"Bai Lao, I will leave with the Black Black Yanwei, and in a short time, I may not come back, and I will leave it to you here. "Underground base, I don't know where it leads to the tunnel mouth, Shang Tianji looked at the black Yanwei who had all walked up to the hundreds of transport vehicles that had been parked in front of the tunnel entrance for a long time, and exited to the side of Bai Laodao.

"You kid can rest assured, our underground base is guarded by a large demon sealing array, and the defense system on the mountain has already been established, plus there are many grass and tree elves secretly guarding it, there is no big problem. Bai Lao smiled.

"In that case, then I'll go and go. Shang Tianji didn't drag mud and water, said goodbye to Bai Lao simply, and then boarded the passenger cab of a transport truck at the front and gave the order to set off.

buzzing

Shang Tianji's voice fell, and the most grass and tree elves who had already been prepared in the cab directly started the transport vehicle, and then hundreds of transport vehicles gradually walked into the tunnel, turned into a steel car, and drove in an unknown direction.

"Landlord, in fact, if you want to send Hei Yanwei to the Innate Beast Domain, we can just use the Nine Heavens Xiangyun directly, with the speed of the Nine Heavens Xiangyun, it doesn't take long to reach it, now through the underground passage, at the current speed, I don't know how long it will take to arrive." On the passenger cab, Xiao Linglong sat on Shang Tianji's shoulder and spoke.

"It's okay, it's a little slower, we're not in a hurry, I mainly want to see how our underground tunnel is built, and at the same time lead Hei Yanwei to see it, let them get familiar with it, maybe they will encounter some trouble in the future, that is, they will use the tunnel." Shang Tianji said with a smile.

As Shang Tianji and Xiao Linglong said, this time Shang Tianji transported many Black Yanwei through the tunnel, which was to send Black Yanwei to the Innate Beast Domain for training.

Originally, with the flying function of the Nine Heavens Xiangyun, if you want to send Hei Yanwei away, you don't have to be so troublesome, Shang Tianji can just use the Nine Heavens Xiangyun to take them around, but in order to see the tunnel established by Bai Lao, and also to let Hei Yanwei go through the tunnel, if there is any emergency, they can escape through the tunnel, so in the end, Shang Tianji decided to take them through the tunnel.