Whale Island. The huge group of sub-metal buildings at the foot of the mountain are like the lair of a steel behemoth, standing majestically. Sub-metal will not rust. As time goes by, the earth is changing, but this prehistoric city is still as it was when it was first completed. . "Can you guess how old this city is?" Lin Dong asked. Pippo retracted his probe and said: "No, submetal is completely unaffected by time and climate. Even if it is a million years from now, it will still be what it is today. Unless" "Unless what?" "Unless it is man-made. "Change this city." "Hi!" Lin Dong sighed and flicked Pibo's head with his finger, "You didn't mean you didn't say it. Since this sub-metal is so unique and precious, it should be. Is it of some use?" Maya lowered her head and thought for a moment, "If you want to say it has some uses, for example, if the core components of the hyperlight engine are made of submetals, it can increase the service life of the engine, and it can also be combined with other metals to produce memories. Alloys, super tough metals, etc." Lin Dong blinked, "Did I hear you right? That thing seems to be far away from us. Memory metal is a good thing. Can it be processed with the current metallurgical level of the mainland? "It's a pity." Maya shook her head, "The processing of this kind of sub-metal requires extremely precise proportions, and many of the necessary minerals do not exist on this planet." Lin Dong smiled helplessly, "It's so big. How can you say that you have a lot of wealth in front of you but can't use it? What about weapons? Can you use these sub-metals to make some swords? " "This is not a good idea. For weapons, it will weaken its hardness, but you can add a little bit to prevent rust," Maya said. Lin Dong was speechless, "Such a large pile of precious sub-metals can only be used to prevent rust! Isn't it overkill?" Maya lowered her head and thought, "Oh! That's right!" Maya's eyes lit up, Said: "You can also make shuttle car hubs and springs!" Lin Dong was hit again, his head was covered with black lines, "Using extremely precious sub-metals in the universe to make springs, this is really extraordinary "Lin Dong and Maya Pibo were talking to each other, and the two brothers Su Qingteng and Su Xing were confused. Lin Dong was an earthling in his previous life, and he finally knew a little bit about high technology. Poor Su. My brothers couldn't understand even a single sentence, it was like a book from heaven. "Lin Dong, we really don't understand what you are talking about. Let's do this. Su Xing and I will go to the village to find some old friends first. You guys can study it first. If you need 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 look around first. By the way, the analyzer is still in the original room, right?" Lin Dong said. "Yes, that machine has many complicated connections and cannot be dismantled and transported away, so it was left in its original place when the college moved. Here is the key. All the rooms are here." After saying that, Su Qingteng threw it to Lin Dong has a bunch of densely packed keys, as many as hundreds. Each key is marked with a number, and you can use it according to the number. Su Qingteng and Su Xing went to the fishing village at the foot of the mountain, while Lin Dong and Maya wandered aimlessly in this mysterious city. "Maya, how does this city compare to your hometown?" Lin Dong asked, pointing to a huge circular building. "There are no buildings made of sub-metal in my hometown. These things are too expensive. Most of these buildings are circular. Our hometown is accustomed to using triangles. Triangles are the most stable structures. Although circles are beautiful, they are not as beautiful as triangles. "It's so solid." Lin Dong was thinking about what a triangular building should look like. Building a house into a triangle is not a practical architectural style. There are corners everywhere and it is easy to hit the head. "Pippo, use your scanner to check if there is a core control area in this city." Maya said to Pipo. "Let Mr. Gui do it. He has very strong mental power. What does the core control area look like?" Lin Dong said. Maya shook her head, "I don't trust that soul." Uh I don't know why Maya doesn't like Turtle Lao very much. Turtle Lao is also more self-aware. Now unless Lin Dong summons him, Turtle Lao never comes out easily. It seems that he is right Maya was scared. "I received some strange high-frequency radio waves. The codes used are not universal codes in the universe. I am now trying to decipher them." Pipo said. Lin Dong and Maya stopped, waiting for Pipo's analysis results. "The deciphering failed and the meaning of this passage cannot be understood." Pipo said.Tao. "Pippo, take us to the place where the radio waves are sent!" the city central square. Several arc-shaped metal pillars are intertwined and are three hundred meters high. From a distance, they look like a sail. "Pippo, are you sure it came from here?" "Well, the radio wave came from about five hundred meters below this building." Maya circled around these huge curved metal pillars. , "It's really strange. These simple pillars have completely different shapes from different directions. They seem simple but are actually unimaginably complex. The creatures that built this city are definitely not simple. There are no submetals on this planet. These They should have brought the metal in from outer space. "But why did they use submetal to build such a huge city? Is there any unknown secret on this planet?" Maya said to herself. Lin Dong and Pipo 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 was an entrance to the underground, it would have been discovered long ago." Lin Dong straightened up and walked to Maya, watching several metal pillars with her. After taking a few glances at Lin Dong, I felt a little dizzy. These pillars seemed to be moving constantly, which was very nerve-wracking to observe. Pipo still didn¡¯t give up. He used his detection tentacles to search carefully inch by inch. Lin Dong lit a pack of cigarettes and sat aside to look at the beautiful scenery of the sea and sky in the distance. Seagulls chirped and soared across the sky from time to time. Whale Island was quiet and peaceful. "Found it! Found it!" Pipo screamed loudly, and Maya and Lin Dong hurried over. The square black iron plates are close to the ground, each piece is more than ten square meters in size. "Where is the passage?" Lin Dong asked doubtfully. Pipo chuckled, "The thickness of this iron plate is 1.5 meters. It is empty below. There are mechanical devices around it to raise it, but I haven't found the switch of the mechanical device yet." Lin Dong pondered for a moment, "You guys Give in, I have a way." Lin Dong took out the Sun and Moon Scimitar from his back, moved his muscles and slashed into the air a few times, "These sub-metals are not strong, I use the knife to cut this iron plate. Just split it and we can go in." Pipo laughed, "Maya, Lin Dong is really stupid." Maya covered her mouth and smiled, looking at Lin Dong without saying anything. Lin Dong sweated profusely, "What's wrong? Since this iron plate is blocking the road, what's wrong with me splitting it?" Pipo ignored Lin Dong and continued to look for the mechanism with his head lowered. Maya said to Lin Dong, who had a black line on his head: "This is a city built by a high-level civilization. Since they hide the entrance, it means they don't want others to enter. They may also set up many deadly defenses. We'd better follow the instructions Master, follow the rules, otherwise I'm afraid there will be trouble. " Lin Dong put away the scimitar angrily. 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 ordinary in mainland China. There is no danger in forcing open the obstacles set up by humans. After all, the mainland's technological level is there, but this place was built by advanced creatures. Who knows if these hateful aliens have personality defects, even if it is forced to open, it will cause the planet to explode. , that is not completely impossible. Maya saw that Lin Dong was a little frustrated and said: "I have studied the ancient civilization exploration course, so I am familiar with these things. Maybe your idea is correct. I am so cautious just to prevent anything." Lin Dong hugged him Passing Maya, he said shamelessly: "If I die, where in the universe can I find such an excellent husband? I'll just tell you how sorry I am." Suddenly, the black metal floor slowly rose up, making a creaking sound. The sound of metal friction was very harsh. After a while, a barrel-shaped metal hut appeared in front of you. Pipo chuckled and ran to Lin Dong, "How about it, Pipo is awesome." Before he finished speaking, a door automatically opened. Lin Dong picked up the communication card and explained the situation to Su Qingteng, asking them to stay on the ground as backup. If Lin Dong didn't call after two hours, it meant he was in danger. Lin Dong and Maya Pippo walked into the barrel-like elevator, pressed the only button, and the iron door slowly closed. Whoosh! In less than a second, the elevator stopped at a staggering speed. Stepping out of the elevator, countless lights lit up at the same time. The light was completely emitted from the walls, illuminating the underground building as if it were daytime. The place where Lin Dong and Maya were standing was a metal platform. Opposite the platform was a closed door, and a narrow bridge connected the opposite side. Under the bridge, there is endless darkness. Lin Dong took out a small lighting device, lit it, and threw it from the bridge. After a long time, I didn¡¯t hear any sound. Lin Dong took a deep breath. "This place is really deep." Pipo said: "My detection limit is five thousand meters, and this abyss is probably far deeper than five thousand meters." Maya held a small instrument in her hand, like a cigarette box , the data on the screen keeps jumping. "The air quality is very good and the ventilation facilities are operating normally." Although there was no one in the underground, Lin Dong still held the [Sun and Moon] Scimitar in his hand out of habit. "Let's go and take a look at the door opposite." Walking across the metal bridge, there is an endless abyss under our feet. This feeling is more exciting than bungee jumping. This door is more than ten meters high and no less than ten meters wide. Maya pressed the button on the door. ? ? ? ? ? ? ? ? ? ? ? The door suddenly opened to both sides, revealing an empty room. In the center of the room, a huge instrument is running, and countless lights of various colors are flashing, making the room look strange and strange. Maya and Lin Dong walked into the room cautiously. "I know." Maya exclaimed as she looked at the instrument. "This machine is connected to the huge metal pillars on the ground. This is most likely a high-power communication system or an energy harvesting system." There are dozens of round instruments densely arranged around it. Chairs, judging from the size of these chairs, the height of these high-level creatures should be more than two meters. The table was in a mess, with a few metal cups lying there, and plates with food on them that had long since turned to dust. Lin Dong frowned, "No matter what kind of creatures these are, I bet they evacuated in a hurry." Maya found a chair and sat down, gently stroking her fingers on the console, "But judging from this instrument "The level of civilization of these creatures has surpassed that of our hobbits. Why did they establish a base in this remote star field, and why did they withdraw in a hurry?" "Pippo, send the data here to the Ark for analysis." "Okay, there is transmission interference here, and we need to return to the ground to transmit data," Pipo said. "Well, let's search here first and see what we can find." The room is large and empty, with nothing else except the instrument in the center. ¡°Old Turtle, come out and use your senses to check if there is anything else fishy in this room.¡± Lin Dong said in the sea of ??consciousness. "The strange thing is that today, there is nothing in his consciousness. No matter how much Lin Dong calls Gui Lao, he still refuses to come out. "It seems that this guy is really afraid of Maya." Lin Dong walked helplessly along the wall, passing his palms along the wall, and threw his perception into the wall. There was no response when his perception was thrown into the wall. , like a fish entering the sea. Suddenly, Pipo's excited voice was heard again. "I found a hidden locker, come and see it." Locker! hidden! Lin Dong ran over excitedly, muttering, "Where are they? Are there any good things?"