Footsteps sounded behind him.Nana didn't know when to wake up.He was fully dressed and walked gently to his side.

"Wake up."

Lu Xuan turned around, grinned lightly at Nana, and gently lifted a strand of beautiful hair from his forehead to behind his ears.

"Okay," Nana blushed like a red apple.

Thinking of the beautiful scenery last night, she didn't know how she got back to the bedroom.

"I'm hungry, let's go eat."

Seeing Nana's red face, Lu Ping resisted the urge to bite, gently swept Nana's slender waist, and walked out.

Today's breakfast is very rich, because there is a roast suckling pig in it.

After careful investigation, they knew it was too early.They visited the survivor's base in Hebei Province and caught some land creatures for him to eat.

"This little girl." Lu Xuan shook his head.This casual behavior, while not very nice, is commendable.How long has he not eaten meat.

They soon ate half of the roast lamb with Nana.Then Xu Zi's phantom appeared on the table.

"Well, Nana, what can I do for you?"

Lu Xuan wiped his mouth and asked suspiciously.

He knew that although Xu Zi was the intelligence system of the base, she had been following Natasha.

Lu Xuan rarely received her, almost forgot.

Seeing Xu Zi appearing now, he couldn't help being surprised.

"Commander, Xu Zi just intercepted a signal and walked towards you when he felt strange."

Xu Zi said softly.His voice is very sweet, like a girl, full of tenderness.

"It's the radio." Lu Xuan nodded and asked.

"No." Xu Zi shook his head, with a very human suspicion on his face.

"The signal was sent from the air. It should have been sent directly from a satellite in space."

"Satellite?" Lu Xuan was stunned. "are you sure?"

It has to be said that Lu Xuan was indeed somewhat skeptical.

He knew that due to the end of the world, for whatever reason, all the satellites launched into space by the countries of the world lost contact, as if they had disappeared into thin air.

No matter how hard they try, they just can't find the missing satellite.

Also, generally speaking, when an aircraft is close to the atmosphere, it can no longer ascend.

It's not that the aircraft is bad, it's that the temperature there is too high.

If someone is careless, even the hardest metal can melt into a puddle of rotting water.

Therefore, the loss of contact with the satellite should be related to the four suns in the sky.

Probably because the temperature is so high, the satellite may melt.

But now Xu Zi said there was a signal in the sky.No wonder Lu Xuan was suspicious.

"Could it be a signal from a country's aircraft passing by?"

Regarding this question, Nana shook her head directly and said: "There are only fixed signals on the plane, which are easy to identify, but Nana has never seen this kind of signal. The signal wave is very strange, not like a normal signal, but like a bunch of garbled characters." .”

"Gibberish?" Lu Xuan frowned slightly and said, "Take it out and let me listen."

"Yes," Xu Zi said, pointing to the player installed in the restaurant, and heard the sound of "呲呲啦啦啦", mixed with some growls and human whispers.

What's more, there appear to be dozens of sounds in the player, such as tsunamis, thunder, explosions, and gunshots.

After a few minutes, every possible sound on Earth reappeared.

It's like someone edited and put these sounds together.It's not a signal, it's someone's prank.

"What is this? Can you translate?" Lu Xuan asked Xu Zi with his ears out.

"It should be fine," Xu Zi nodded, and continued, "But it may take some time."

"Okay, please." Lu Xuan nodded, hopeless.

If he didn't know that Xu Zi would not deceive himself, he would definitely think it was Xu Zi's prank.

At the same time, he also looked forward to what records would there be if Nana really cracked something?
One text remains a text message from an alien friend.These are all possible.

After sending Xu Zi away, an excited voice came from Lu Xuan's earphones.

He had heard it was one of the first scientists recruited.

"Commander, come quickly to Laboratory 37.

We've made a major discovery that may help us unravel the mystery of the end of the world. "

"what?"

Listening to the excited voice in the earphones, Lu Pingteng stood up from the chair.His expression is seldom agitated.

The coming of the end of the world is a puzzle that haunts the world.

Why did the sun disappear before the four suns appeared?

Why don't these four suns emit more harmful substances than before the end of the world, except heat.

There is also the emergence of the end of extreme cold, and what is the origin of snowflakes that can instantly freeze anything.

Did those unknown creatures really come from the glacier?Have they existed on earth for a long time?They existed for 10, 100, or 1000 years.

If unknown organisms existed long ago, how were they frozen in glaciers, and how did they survive in the ice for millions of years.

Lu Xuan wasn't the only one caught in this predicament.It believes that everyone in the world is hungry for answers.

The words of the scientist in the scientific research room aroused Lu Xuan's interest for a while.

Scientific research laboratory.

Lu Xuan and Nana hurried up.As soon as he entered Lab 37, he saw more than 20 scientists surrounded.

"Commander, you are finally here." At this moment, a scientist came over.

"what have you found?"

Lu Xuan nodded, then asked.

He is more concerned with the discoveries of these scientists.It would be great if he could actually solve the mystery of the end of the world.

"Look at this first."

After speaking, the old scientist handed the pill to Lu Xuan.On it, there is a curve table divided into many areas.All the above marks are in Chinese and understandable.

"Here's the temperature profile."

Looking at the temperature, time, date and radiation of various harmful substances in the air marked on it, Lu Xuan was dazzled and a little confused about what it was.

"what is this?"

Really didn't understand, Lu Xuan could only hand him the tablet in his hand, and then asked suspiciously.

"Commander, let me explain slowly. The above table records the range of changes in the external temperature and various harmful substances produced by the sunlight in the air in the past ten days. In order to record these data more effectively, we will test it every two hours. "

"Look at these curves representing the temperature. Over the past ten days, we've seen the temperature drop by 0.5 degrees every three and a half hours. Strangely, the harmful substances in the air are rising by 0.1 degrees every three and a half hours."

When Lu Xuan heard the scientist's explanation, his eyebrows frowned slightly.

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