Whale Island.

The huge sub-metallic buildings at the foot of the mountain are like the nests of a giant steel beast, standing majestic, sub-metals will not rust, time passes, and the earth is changing, and this city that has existed prehistoric still looks like it was when it was first completed.

"Can you guess how many years this city has been?" Lin Dong asked.

Pibo retracted his probe and said, "No, sub-metals are completely unaffected by time and climate. Even if it is a million years later, it will still be like this today. Unless..."

"Unless what?"

"Unless the city is artificially changed."

"Hi!" Lin Dong sighed and flicked Pibo's head with his finger, "Don't you say that. Since this sub-metal is so unique and precious, it should be of some use, right?"

Maya lowered her head and pondered for a moment, "There are indeed useful things. For example, if the core components of a superluminal engine are made of sub-metals, they can improve the service life of the engine, and can also be combined with other metals to produce memory alloys, super tough metals, etc.."

Lin Dong blinked, "I heard it right? Superlight speed engine? That thing seems to be far away from us. Memory metal is a good thing. Can the current metallurgical level of the mainland be processed?"

"It's a pity." Maya shook her head, "The processing of this sub-metal requires extremely precise ratios, and many essential minerals do not exist on this planet."

Lin Dong smiled helplessly, "Such a huge amount of wealth is in front of you but cannot be used. What is this called saying? What about the weapons? Can you use these sub-metals to make some swords and the like?"

"This is not a good idea. Sub-metal itself is not hard. Making cold weapons will weaken their hardness, but you can add a little to prevent rust." Maya said.

Lin Dong was speechless, "Such a large pile of expensive sub-metals can only be used to prevent rust! It's too big and useless, right?"

Maya lowered her head and thought, "Oh! By the way!" Maya's eyes lit up and she said, "You can also make the wheel hubs of the shuttle and the springs!"

Lin Dong was hit again, his head was covered with black lines, "It is really a luxury to make springs from extremely precious sub-metals in the universe."

Lin Dong and Mayapibo were talking and talking. The two brothers Su Qingteng and Su Xing were both overwhelmed. Lin Dong was a native of the earth in his previous life, and finally knew a little about high technology. The poor Su brothers couldn't even understand a word, as if they were like heavenly books.

"Lin Dong, we really don't understand what you are saying. Let's do this. Su Xing and I will go to the village to find a few old friends. You can study it first. If we can use our words, go to the Yuelai Hotel at the foot of the mountain." Su Qingteng said helplessly.

"Oh, that's fine. Maya and I will take a look around first. By the way, that analyzer is still in the original room, right?" Lin Dong said.

"At that machine has many complex connections that cannot be removed and transported away, so it stayed in its original place when the college moved. This is the key, and all the rooms are here." After saying that, Su Qingteng threw a large string of dense keys to Lin Dong, with as many as hundreds, and each key was numbered on it, and you can use it according to the number.

Su Qingteng and Su woke up and went to the fishing village at the foot of the mountain. Lin Dong and Maya wandered around this mysterious city aimlessly.

"Maya, how is this city compared to your hometown?" Lin Dong asked, pointing to a huge circular building.

"My hometown does not have buildings made of sub-metals. This thing is too expensive. Most of these buildings are round. Our hometown is accustomed to using triangles. Triangles are the most stable mechanism. Although the circle is beautiful, it is not as strong as triangles."

Lin Dong was thinking about what a triangular building should look like. Building a house into a triangle is not a practical architectural style. It is easy to touch the head when there are edges and corners everywhere.

"Pipo, use your scanner to see if the city has a core control area." Maya said to Pipo.

"Let Turtle come. He has strong mental power. What does the core control area look like?" Lin Dong said.

Maya shook her head, "I don't trust that soul."

Well…

I don’t know why Maya doesn’t like Turtle Old, and Turtle Old is also self-aware. Now, unless Lin Dong summons him, Turtle Old never shows up easily. It seems that he is very afraid of Maya.

"I received some strange high-frequency radio waves, and the code I used was not very common code in the universe. I am trying to decipher now," Pibo said.

Lin Dong and Maya stopped and waited for Pibo's analysis results.

"The deciphering failed and the meaning of this passage was unable to be interpreted." Pipo said depressedly.

"Pibo, take us to the place where the radio waves are emitted!"

...

City Center Square.

Several arc-shaped metal pillars are intertwined, reaching 300 meters high, and from a distance they look like a sail.

"Pipo, are you sure it was sent from here?"

"Well, the radio waves are emitted from about five hundred meters below this building."

Maya turned around these huge arc-shaped metal pillars, "It's really strange. These simple pillars have completely different shapes from different directions. They seem simple and are actually so complex that they are unimaginable. The creatures that build this city are definitely not simple. There is no sub-metal on this planet. These metals should have been transported in from outer space."

"But why are they using sub-metal to create such a huge city? Is there any unknown secret on this planet?" Maya said to herself.

Lin Dong and Pi Bo carefully explored the ground, hoping to find the entrance to the underground.

"These buildings have been discovered for more than two thousand years. If there is an entrance to the underground, it would have been discovered long ago." Lin Dong straightened up and walked to Maya, and accompanied her to watch several metal pillars. After looking at Lin Dong, he felt a little dizzy. These pillars seemed to be moving constantly, which was very sad to observe.

Pibo still did not give up. He used his detection antennae to search carefully inch by inch.

Lin Dong lit a bag of cigarettes, sat aside and watched the beautiful scenery of the sea and sky in the distance. From time to time, seagulls were chirping and soaring across the sky. The Whale Island was quiet and peaceful.

"Finished! Found!" Pipo screamed loudly, Maya and Lin Dong hurried over.

Square black iron plates are clinging to the ground one by one, each with a size of more than ten square meters.

"Where is the passage?" Lin Dong asked in confusion.

Pibo smiled, "This iron plate is 15 meters thick, and it is empty below. There are mechanical devices around it to lift it up, but I haven't found the switch of the mechanical device yet."

Lin Dong pondered for a moment, "If you give in, I have a way."

Lin Dong took out the Sun and Moon Scimitar from behind and put it in his hand, moved his muscles and bones to slash the air several times, "These sub-metals are not strong. I will split this iron plate with a knife and we can get in."

Pipo laughed, "Maya, Lin Dong is really stupid."

Maya covered her mouth and smiled softly, and secretly looked at Lin Dong and didn't speak.

Lin Dong Khan, "What's wrong? Since this iron plate is blocking the road, is there anything wrong with me splitting it?"

Pibo ignored Lin Dong and continued to look for the agency with his head down.

Maya said to Lin Dong, who was on the black line, "This is a city built by high-level civilizations. Since they hide the entrance, they do not want others to enter, and they may set up many fatal defenses. We should do it according to the rules of our masters, otherwise there will be trouble."

Lin Dong put away the scimitar in disappointment. Maya's words did make some sense. Lin Dong's thinking is not used to thinking according to the ideas of high-level civilization. If this is an obstacle set by ordinary people in the mainland, it is not dangerous to force it to open it. After all, the technological level of the mainland is there, but this is built by advanced biologicals. Only those who know whether these hateful aliens will have personality defects. Even if forced opening it will cause a planet explosion, it is not completely impossible.

Maya saw Lin Dong a little frustrated and said, "I have studied ancient civilization exploration courses, so I am more familiar with these things. Maybe your thinking is correct. I am so cautious just to prevent it."

Lin Dong hugged Maya and said shamelessly: "If I die, where will I go to find such an excellent husband like me in the universe? If I feel sorry for me, I will just say it."

Suddenly, the black metal floor slowly rose, making a squeaking sound of metal rubbing, which looked very harsh.

A moment later, a barrel-shaped metal hut appeared in front of you.

Pi Bo chuckled and ran to Lin Dong, "How is it, Pi Bo is so awesome."

Before the speech passed, a door popped open automatically.

Lin Dong picked up the communication card and explained the situation to Su Qingteng, and asked them to stay on the ground for backup. If Lin Dong did not call in two hours, it means he was in danger.

Lin Dong and Mayapibo walked into the bucket-like elevator, pressed the only button, and the iron door slowly closed.

Whoosh!

In less than a second, the elevator stopped, and the speed was astonishing.

When you walk out of the elevator, countless lights light up at the same time, and the light emits completely from the walls, illuminating the underground building like daytime.

The place where Lin Dong and Maya stood was a metal platform. Opposite the platform was a closed door, and a narrow bridge was connected to the opposite side.

Under the bridge, there is endless darkness.

Lin Dong took out a small lighting card, lit it up, and threw it down from the bridge.

After a long time, I didn't hear any sound.

Lin Dong took a deep breath. "This place is really deep enough."

Pibo said: "My detection limit is five thousand meters, and this abyss is probably far more than five thousand meters."

Maya was holding a small instrument in her hand, like a cigarette box, and the data on the screen kept jumping.

“The air quality is good, and the ventilation facilities are operating normally.”

Although there was no one underground, Lin Dong still habitually held the [Sun and Moon] scimitar in his hand.

"Let's go and go to the door opposite to take a look."

Walking through the metal bridge, there is an endless abyss under your feet, which feels even more exciting than bungee jumping.

The door is more than ten meters high and is not less than ten meters wide. Maya presses the button on the door.

Swish!

The door suddenly separated to both sides, and there was an empty room inside the door.

At the center of the room, a huge instrument was running, and countless lights of various colors flashed, mapping the room with bizarre colors.

Maya and Lin Dong walked into the room carefully.

"I understand." Maya exclaimed as she looked at the instrument.

"This machine is connected to the huge metal pillars on the ground, which is likely to be a high-power communication system or an energy harvesting system."

There are dozens of chairs arranged densely around the round instrument. It can be judged from the size of these chairs that the height of these high-level creatures should be more than two meters.

The table was messy, with several metal cups pouring there, and there were plates containing food. The food on the plate had already turned into dust.

Lin Dong frowned, "No matter what creatures these are, I bet they evacuated in a very hurry."

Maya found a chair to sit down, and gently stroked her fingers on the console. "But judging from this instrument, these creatures are more civilized than our Hobbits. Why did they build bases in this remote star field, and why did they evacuate in a hurry?"
To be continued...