"Professor, Wang Gang has returned from the Song Dynasty"

"Let's go, let's see"

Several people came to the tenth basement floor.

A machine resembling a small flying machine was parked in orbit, and a young man was opening the hatch and struggling to climb out of it.

"Wang Gang, how is it, went to that era?" The professor asked eagerly.

"When I arrived in the Southern Song Dynasty, I wanted to go to the Tang Dynasty to bring Yang Guifei over to talk to the teacher, but I was afraid that I wouldn't be able to come back if I ran out of electricity, so I came back in a hurry" Wang Gang barely squeezed out a smile.

"You stinky boy, just come back safely"

This time we were able to make such a big breakthrough and successfully travel through thousands of years.

Everyone was full of joy and discussed the next research direction. A group of people walked towards the elevator as they spoke, and the small-eyed researcher who walked behind secretly pulled out his phone.

I typed a few words and sent it out.

Wang Gang and the professor came to the professor's office, and the professor still had a few questions and wanted to ask Wang Gang separately.

"Wang Gang, did there any problems occur when the machine was running?"

"Teacher, everything is running normally, but I'm a little dizzy, can you let them be guinea pigs next time?"

Wang Gang complained.

"It's not that the teacher doesn't understand you, it's that this matter is too confidential to allow a little slip up."

"I know this, after all, there are many people who covet these technologies, so I will talk about it" Wang Gang ran behind the professor with a smile and kneaded the professor's shoulder. Suddenly, there was a flute.

"Teacher, why is it that in less than half a day, your hair is so white."

"You've been gone for half a year, and you can't feel it in the space-time machine," the professor smiled. lovingly took Wang Gang's hand.

Although the two are teachers and students, they are better than father and son, and the professor has no children and no daughters. And Wang Gang's parents died when he was a child.

Wang Gang recalled the scenes he saw in the shuttle.

If this project is completed, he really wants to drive the shuttle and go back to that troubled dynasty and do something for the people there.

"This time you came back from the Song Dynasty, proving that our research is in the right direction"

"We have improved the power plant and increased the battery life, and I believe it will not be long. We will be able to unlock the code of the Great Wall of Qin."

The teacher's face showed a hint of relief, and he paused to continue.

"Now the international situation is becoming more and more complicated, and there are more and more forces coveting the Great Wall of Qin in our country."

"After all, it is a building that can resist nuclear weapons, and it is the key to the survival of our Chinese descendants."

"Why don't they study the pyramids, wouldn't that be able to resist the little boys?" Wang Gang was a little puzzled.

"Now it has been confirmed that the pyramid is nothing more than a launching device, which should have been built by ancient civilizations in order to leave the earth, while the Great Wall of Qin was built to defend against foreign civilizations, and the two are not the same." The professor's face was full of pride.

As the two were talking, the roar of a helicopter could be heard over the factory. The two looked at each other and their faces changed.

"Bastard, this group of thieves is not dead," Wang Gang said angrily.

"I'm afraid it's not so easy to deal with this time, we just succeeded, and before we had time to report to the top, the other party came, it seems that we have an internal ghost here" The professor's heart was like ashes.

His own lifelong research seems to be someone else's wedding dress, how willing he is.

"I'm going to find him, kill him, and die together." Wang Gang was not angry and wanted to go out to find the inner ghost.

The professor hurriedly stopped him, "Now is not the time to deal with this, you come with me." ”

The professor dragged Wang Gang into the inner room, which was locked all year round, and only the professor could open it, verified by the retina, and infrared brain waves. A safe was opened and a mechanical box was taken out of it.

Wang Gang next to him looked curious.

"This is a parallel universe exchange device, it can only be used in the large pass near the Great Wall of Qin, the Great Wall of Qin is partly on the ground and part underground, it is a passage connecting the balanced universe, this is the biggest secret of the Great Wall of Qin, and people outside may not know that this thing must not fall into their hands."

The professor put the thing in Wang Gang's hand and advised, "You take this thing now, take the shuttle, and go to unlock the code of the Great Wall." ”

"What is the balance of the universe exchange, teacher, you go with me." Wang Gang hurriedly asked.

There were explosions outside, and a few gunshots, and they had rushed in.

"There's no time, you go quickly, you can go up to the tenth floor underground." I can delay for five minutes and recharge the shuttle as quickly as possible. As he spoke, the professor pushed Wang Gang into the elevator.

The elevator soon reached the tenth basement floor, and Wang Gang put the parallel universe exchange device on the shuttle, picked up the power supply, plugged it into the shuttle, and began to charge. Suddenly the whole city was plunged into darkness, and all the power was sucked in by the small shuttle.

When the professor saw Wang Gang go down, his face relaxed, and he walked to the console next to him and operated.

Yes/No: Activate the self-detonation device.

A large exclamation mark is displayed on the LCD screen, and a red alert fills the screen.

So, the professor didn't hesitate to click OK.

Please authorize. A string of password prompts appears on it.

The professor enters the password. Verify the iris.

The self-detonation device has been activated, please leave within five minutes.

A countdown on the screen, 4:59

Suddenly, the air defense sirens sounded throughout the building, and all basement doors were physically closed.

The professor stepped outside, looking at the terrified researchers and a group of heavily armed black camouflage mercenaries across from him.

"Professor Yu, we meet again, although each meeting is not very pleasant," the voice sounded, with some teasing.

"If I could, I wouldn't want to see you for the rest of my life".

"Why do you bother, you don't even think about your students, let these proud sons of heaven die with us."

The lead mercenary said, pointing to the air raid siren on the roof of the building, which was nothing more than a pediatric for them.

"If Professor Yu is willing to join our organization and hand over his things, I guarantee that all the research funds and treatment will be twice as good as here," the lead mercenary continued.

Then he secretly gave the person behind him a look.

Professor Yu glanced at the researcher, and his face was unbearable.

"If you promise to let them go, I can go with you."

The person on the other side didn't expect Professor Yu to be so happy this time, although he was a little suspicious, he also relaxed his vigilance.

"That's natural, I'm talking to someone, but can this self-detonation be lifted first." The leader smiled playfully.

As long as the self-detonation is lifted, nothing is a problem. The purpose of his coming here is to take away the materials, and of course it would be best to take Professor Yu away.

"Yes, but now the electric door lock is locked, and someone needs to physically open the door lock. You can ask a few to come with me."

After speaking, he took the lead and walked to the door of the basement floor, and the leader waved his hand, and several people followed.

Several people took out the cutting equipment, and half a minute later opened the door to the basement floor.

Walking slowly towards the stairs, the doors of several basements were opened.

Time passed little by little, and slowly the mercenaries realized that something was wrong.

The leader stopped and looked at Professor Yu.

"How many more doors" he asked.

Professor Yu said, "There is another one, I don't know if I have time to open it."

After speaking, he took out a delicate small pistol, pointed it at his chest, and pulled the trigger.

Wang Gang, who was on the tenth floor underground, felt a sudden pain in his chest, and looked up at the countdown on the wall.

0:16 0：15 0:14

The charging display is only 87%, which seems to be undercharged. Hurriedly unplug the charging device and jump on the shuttle.

Start the shuttle ..........

The long tunnel was dark, with only a few bright lights on the screen, pulsing rapidly.

2045203620211982..... A.D.

Then the full launch does not look real.

A dozen seconds later, there was a huge explosion, and the entire building was turned into a sea of fire.