The aircraft carrying Gern and his group quickly crossed the sky above Garcia's territory and headed towards the Gigans Mountains where the Robert family was located. The distance between the two places was very long and it took almost a day to go. During this period, Riyoll had been teaching other people about the city of their family. The Black Steel City was not a long history compared to the territory of other families. Before the Battle of Saving the World, Yoll's family was just an ordinary family of skilled craftsmen, and most of the members were skilled craftsmen and technical engineers in various fields. It was the first time they discovered the strange effect of the crystallization of the tower after the Battle of Saving the World that gradually grew stronger.

Through a cloud, a continuous mountain appeared in front of everyone. Yoll was driving the aircraft and shuttled through the mountains in an orderly manner. A grand canyon came into everyone's eyes. Through the thin clouds, a metal city slowly appeared in front of everyone.

Countless tall buildings of steel grow like bamboo shoots on the ground. The buildings stand among the canyons. The curtain wall glass outside the building shines brightly under the sun, as if they are crystals appearing in the raw stone. Looking down, the whole city is crisscrossing, as if it is being manipulated by an invisible big hand, operating in an orderly manner. There are many kinds of bionic robots shuttle back and forth on the streets, working hard, and living in harmony with humans. These machines are not old electric drive machines like Siren, but the product of the highest new technology in the guidance technology, which can engage in extremely complex tasks.

"A century ago, when the Battle of Salvation just ended, in that era of gold rush, people flocked to mining areas to look for high-priced tower crystals. Our family was the first group of gold diggers to come to the Kidgans Mountains. In that era, some people became rich overnight, and some people never saw a single gold and silver in their entire lives. Fortunately, our family was the former. This is thanks to the emergence of a great inventor among our family's ancestors, Anlai Robert, the founder of Black Steel City. Using the sensing effect between crystals, he invented a

This kind of guide device that can directly detect crystallization under the rock formation has greatly improved the efficiency of our family's gold digging. In just a few years, our Robert family has become the best among the gold digging families in the Gigans Mountains. Our family has passed on this concept of technological innovation and transformed it into a dreamy mechanical city after decades of time. Now, it no longer focuses on mining rare minerals as its main business, but has changed to producing high-end technology products customized by governments in various countries, becoming a real science and technology city.”

Yoer excitedly introduced the glorious history of his family's past to everyone, his tone was full of pride. Soon, the aircraft entered the pass outside the canyon city.

At the checkpoint, you can see aircraft from all over the world waiting for inspection here. Every day, countless people come to Heigang City. There are caravans of merchant ships who purchase guides or sell industrial materials, as well as smaller private aircraft, and even a big guy for aerospace exploration - the Blue Whale. Everyone in the team exclaimed excitedly, that was something that could only be seen in textbooks. Vehicles from all over the country lined up in long queues, waiting for security checks.

Several flying robots hovered around the aircraft being inspected in front, emitting light to scan the aircraft. The scanning speed was very fast. After a while, the basic information of the aircraft being inspected was obtained, which eliminated safety hazards and let the aircraft pass the checkpoint. Although the queue was long, the robot's detection was very efficient. It was soon the turn of the aircraft being driven by Yoer. Yoer took off the watch on his wrist and showed it to the flying robot. The flying robot quickly identified the family badge on the watch and confirmed Yoer's identity.

"Welcome the young master Yoer back to Heigang City. The master of his hometown has been waiting for a long time." The robot made a crisp mechanical sound, and shook his arms enthusiastically as if he was welcoming Yoer back.

Yoll successfully drove the spacecraft, passed the pass, headed towards the inside of the Mechanical City, and drove all the way to the castle of the Robert family. It was called a castle. This place was actually a giant towering building with advanced and modern glass coatings, and even a thought guide circuit was embedded inside. It can be used as a giant screen to broadcast images, just like a huge screen, and can also be used to activate the shield barrier in critical moments.

The aircraft slowly landed on the top of the building and finally landed smoothly. Everyone also got off the aircraft. Not far away, a bald middle-aged man walked up, wearing a white coat, single-piece eyes and beard. Yoll quickly walked up to salute him. He was not a silencer, and did not perform the silencer ceremony, but just bowed slightly, while Gehn and his friends all gave gifts one by one except Naile.

"Father, I'll be back." Yoel said with a smile, "How is it? Have you grown taller? I didn't expect me to be able to enter the academy?"

"Hey, you guys, will say something that is not... Let's talk about your business first. I already know about Sirius, so let me follow me." Old Robert got straight to the point and led everyone to the research and development location of the ultra-high-speed aircraft with a smile.

It was in the simulated wind tunnel underground in the Gigans Mountains, specially built for this big guy. The wind tunnel was so big that it seemed that dozens of super-large aircraft could pass through at the same time, and there was still some extra money. Everyone couldn't help but be stunned and began to admire the powerful technology and financial resources of the Robert family. The lights lit up from afar in the tunnel, and soon everyone could see the full picture of the spacecraft.
Chapter completed!