In the Avengers Building, Stark is explaining to Dr. Banner the 'archaeology' that shocked the world, a complete underground city, and built by another civilization that took the path of rune technology.

A series of photos and videos, Dr. Banner was dumbfounded, his eyes were about to bulge, and even his hand scratching his hair that was oily enough to stir-fry stopped moving, staring blankly at the holographic projection screen next to Stark.

He had the feeling of hearing the Arabian Nights, thousands of years ago aliens descended on Earth, built an underground city, and then was discovered thousands of years later and entered the city to explore... Isn't this a Hollywood movie plot?

When Stark finished speaking, Dr. Banner took a few deep breaths, digested the huge amount of information in his mind, and said, "So you're saying that there is an alien city below San Juan, with a history of more than 5,000 years, and it can still be used normally?" ”

"That's right!"

Dr. Banner took off his glasses, lifted the hem of his shirt, wiped them carefully, and asked, "So what can I do?" ”

A whole alien city, absolutely earth-shattering, if there is no idea of handing it over, it must be that the fewer people who know, the better, since Stark told him, then he must be asked for help.

Stark nodded, tapped a few times on the holographic projection, and opened another video: Greel, who was wearing short sleeves and jeans, turned his back to the 'camera' and tapped on the stone wall, and then the stone wall suddenly lit up and quickly spread throughout the room, emitting a dazzling blue light that lasted for three seconds before dissipating, as if the computer was turned on.

After the light faded, the stone wall opened a door, and outside was a long corridor with a pattern of circles and lines every two meters on both sides, illuminating the corridor like a wall lamp.

"It's—" Dr. Banner had seen something like this for the first time, how a stone wall resembled a circuit board.

"Rune Tech." As Stark spoke, he opened up the patterns engraved on the stone slabs and said, "The circles and lines are like the binary of computer language, forming command symbols, forming complex rune circles, and executing all kinds of commands.

There is also a rune circle that seriously interferes with the wireless signal, I suspect it is a factor in the energy field, so if you want to explore this city quickly, you must find a way to solve the interference, and there may be a virus in the alien city..."

Stark said at length, and Dr. Banner also knew what Stark was going to do when he asked him, first of all, he valued his biological knowledge, studied the microbial status of the city that had been closed for thousands of years, and viruses, and secondly, he worked with Stark to study and solve the energy field interference signal of the rune circle and decipher the runes, etc.

"Deciphering runes? What about Greer? "Dr. Banner thinks that Grell is the professional as a mage.

"He went back to reading."

"Huh?"

"Kama Taj's rune book."

"Oh!"

For this reason, the excavation work had to be interrupted, and a relay station was built in the tunnel with wire, so that the drone's signal could be restored and the work continued, but the progress was delayed for a long time, until the moon hung high in the sky, and the tunnel was completed more than 100 meters deep.

Grell held the searchlight, connected the half-length harness to the rope, and dragged the rope slowly down with one hand, supporting the metal barrel of the tunnel, and four small lights were evenly distributed every two meters to illuminate the long tunnel, extending to the bottom, before returning to a pitch black patch, looking like a wide open mouth, waiting for food to arrive.

"I'm going down." Grell checked the headphones, nodded at Daisy, and then started the traction machine, so that the wire rope fell at a speed of one meter per second, Daisy didn't bother to look at the communicator, lying on the edge of the tunnel, looking at the slowly falling Greel.

Stark, who was far away in Manhattan, also put down the analysis work of alien metal, raised his head, and looked at the holographic projection in front of him, Greer's figure was gradually shrinking, and finally became a point that could hardly be distinguished by the naked eye.

Greel's feet lightly rested on the dusty stone slab, and the searchlight in his hand glowed brightly, dispelling the darkness around him and illuminating the place where he was: a vaulted hall about two hundred square meters in size.

The beam swept around, and the walls he saw were all filled with rocky textures, although they were covered with dust, but he could vaguely see lines and circles engraved on them, which reminded Grell of Asgard's rune circle, but the rune circle on Asgard's building was not as dense as here.

Could it be that the runic technology in this dungeon was more developed than Asgard back then, or maybe this room was just an exception and not representative of all places?

In an instant, many thoughts went through Greer's mind, and he couldn't help frowning, and began to wonder why there was a rune circle here that was so similar to Asgard.

A batch of bundled instruments and equipment slowly fell from the tunnel behind him, and was hoisted down by ropes, and Grell hurried over to untie the portable signal relay station, move it aside, and plug in the cable hanging from above the tunnel.

The light came on, and then Daisy's voice came from the headset: "Greel, do you hear that?" ”

"I heard it, it seems that it only has an impact on the wireless signal." As he spoke, Grell opened his backpack and took out several fluorescent lamps made of flexible materials the size of a palm, flung them upward, and the fine barbs firmly grasped the stone ceiling, and then emitted a soft light, illuminating the room.

Immediately afterwards, five or six quadcopters with a diameter of less than ten centimeters flew down from the tunnel, scattered, and the instruments on them began to scan the 200-square-meter room, transmitted to the ground through the newly turned on communication relay station, sent to Stark Industries' satellites, and finally arrived at Stark Labs in Manhattan.

Stark completely put down the experiment in his hand, looked at the picture transmitted by the drone, and asked, "Is there no door?" ”

The drone has scanned a circle, and there are stone slabs up and down, left and right, and there are no doors or windows, and the ground penetrating radar clearly shows that the back is empty.

Grell walked around the room with a searchlight, carefully observing the rune circle on the wall, and when he heard Stark's inquiry, he guessed, "Maybe it's an automatic door?" ”

"Automatic doors?" Daisy, who was hoisting equipment and instruments down in batches on the ground, sounded very novel, this stone building, and automatic doors? Not to mention that the thatched house is equipped with a luxury home theater and KTV.

"Our automatic door is driven by chips and electricity, and this uses a rune array, with a line of 1 and a circle of 0." Grell muttered to himself, walking around the wall with a flashlight, carefully observing the rune circle on the wall.

The book is rarely used when it comes to use, Grell has always read magic books written in various ancient languages, and has mastered a large number of ancient languages that have long since died, but the rune circle... I really don't know much about it.

There is a specialization in the art industry.

Magic is magic, rune circle is rune circle, this is like a programmer is not the same as repairing a computer, can not be generalized, it is easy to understand that the rune circle is thought of as a circuit board, a circle is on, a certain line is off, and complex instructions are completed through switches.

After searching for a long time, Grell found what seemed to be the order to 'open the door', the reason why it seemed was because the rune circle on these walls was still very different from the rune circle of Kama Taj, and after hesitating for a few seconds, Grell still tried to activate the command rune with magic power.

The unpretentious gray notch suddenly lit up with a clear blue light, spreading along the interconnected lines at a very fast speed, and everywhere it passed, the lines of different lengths and circles of different sizes all lit up.

"Uh..." Grell was stunned for a moment, looking at the bright stone wall in front of him, he couldn't help but take two steps back, but the blue light had spread to his feet, and in an instant, all the stone slabs inscribed with rune arrays in this room were lit up, as if he was in a sea of light.

The sudden change stunned all three of them, and then Daisy shouted, "Greel, hurry up." ”

She was only halfway through her sentence when Stark's voice rang out in the communication channel: "Get out of there." ”

"Don't worry, it's okay, it's a normal phenomenon for the rune circle to be activated." Grell turned off the flashlight as he spoke, and threw it back, the tiny flashlight tumbling in the air a few times before landing precisely into the backpack placed on the floor.

There was a slight friction sound, and the integrated stone wall cracked a crack, and then slowly opened, revealing a corridor, and there were bright lights on the 'stone walls' on both sides of the corridor, like wall lamps, illuminating this corridor that was more than 20 meters long.

Three drones floated over, the camera pointed at the corridor, Stark was extremely surprised and said, "Can the city's power plant still work?" ”

According to the preliminary exploration of the drone-mounted instrument, the stone wall is at least 5,000 years old, what kind of power source can standby for such a long time, and can operate normally to provide energy supply.

"What did you do?" Daisy wondered what Grell had just done, and not only opened the door, but also lit up the hallways outside.

"It's just a matter of trying, can you activate the rune circle." Grell was also a little surprised, he just wanted to open the door, how did it seem that a lot of things were activated, the power system, the lighting system, etc. were all running, so the automatic door opened, and the room and corridor were also lit up.

As he spoke, the miniature multicopters for confined spaces flew into the corridor and began to scan the corridor and the rough stone walls, a large amount of data compiled into a structural map.

The corridor is flanked by houses that resemble human residential buildings, with residents sharing a hallway, and at each end of the corridor there are holes that appear to be elevators leading up and down.

According to the image taken by the drone [58 fo], the corridor is also inscribed with rune circles everywhere, so this room is not an exception with rune circles, but a common phenomenon, giving people the feeling of coming to the Rune Continent, full of runes and eyes.

The drone flew into the 'elevator shaft' and began to go down, wanting to see the situation on other floors, but after falling more than ten meters, it suddenly lost its signal again.

Greer witnessed the drone suddenly lose control and tumble down, and said, "It looks like we're going to build many, many relay stations." ”

Stark nodded, according to Jarvis's calculations, this dungeon has a strong signal interference, the straight-line distance is fifty meters, and every other wall will be reduced by ten meters, that is to say, the drone can penetrate four walls at most, so that if you want to explore this dungeon, the light signal relay station must be built hundreds or thousands, and each relay station needs to be connected by lines.

Such a huge volume of transportation, but also taking into account strict secrecy, can never be completed in a day or two, so it is necessary to find a place other than the guard tower to re-drill wells, and then carry out large-scale transportation of materials.

With a decision in his heart, Stark spoke: "Okay, Greel, you come up first, and leave the rest of the work to Jarvis, keep the lines and ground signal receivers, backfill the shaft, and eliminate the ground traces..."

Stark babbled on and on about the follow-up finish, the exploration of the dungeon is more difficult than expected, and the preparation work that needs to be done is far beyond their imagination, since it is a rune city, then it is necessary to figure out the runes first, otherwise it is likely to be difficult to move an inch, and even lead to extremely serious consequences.

The only way to figure out why there is such a severe attenuation of the signal is to solve this problem in order to start exploration work as soon as possible, and to buy a piece of land close to a port or airport to dig tunnels and transport supplies, etc.

There is a lot to do, but Stark is willing to put everything into exploration and research, thinking about the city and the power source that can last for thousands of years, and only need to study these two results thoroughly, it is enough to shock the world, not to mention that a civilization different from human beings, the temptation is too great.

Once the research results are obtained, it is equivalent to opening the Rune Age, thinking that only need to carve some magic circles on the stone slab can make the building last for tens of millions of years, and even turn it into automatic doors, lights... Definitely an alien technology that changes the world and the way people live.

Grell dragged the rope and returned to the ground under the action of the traction machine, and the components supporting the tunnel shrank one after another along the way, and then fell down and fell into the room, while Grell used earth magic to backfill the tunnel, leaving only the line that transmitted the signal, allowing Jarvis to direct the drone to shoot and explore the current range in detail.

The main reason is that this place is not hidden enough, in case some risky (dead) family (person) to explore, it will be easily exposed, so it is necessary to find a new location in the urban area to dig a tunnel, then there is no point here, backfilling, eliminating traces can be kept secret.

Once on the ground, Grell and Daisy worked together to deal with the traces on the ground, hiding the satellite receiver above the watchtower, and burying the lines in the stone wall with magic until there was no trace of them.