In front of the wall where the mural was discovered, Explorer III was working with a robotic arm.

The ionic wind blew away the thick dust, and for a while the air was filled with various floating particles, and the images transmitted back by the explorer robot also became gray.

"Buzz ......"

The exhaust fan was turned on, and the sound of the engine running kept coming from the speakers.

The suspended particles in the air are sucked in by the exhaust fan, and after passing through the filter made of synthetic fibers, the number of suspended particles is greatly reduced, and the gray screen gradually becomes clear with the sound of the fan.

With the careful operation of the glasses man's men, a large area of the wall was cleared out, revealing its true colors.

"This is truly spectacular......," Chen Zheng couldn't help but sigh as he looked at the colorful mural.

The most common depictions of the murals are dark-skinned, long-legged humanoids, dressed in ornate floor-sweeping robes with high crowns, looking rich and confident.

The weapon in their hands caught Chen Zheng's attention - unlike ordinary firearms, their weapon was actually a long cane with a huge crystal inlaid at the top.

"Zoom in here...... That's zero crystal? Chen Zheng leaned near the screen, looked at the crystals that filled the entire screen, and asked with some uncertainty.

"It should be Zero Crystal, most of the civilizations discovered the use of Zero Crystal in the early stage of development, and some races that are very sensitive to Zero Crystal have already developed and utilized Zero Crystal on a large scale during the period of ignorance."

The man in glasses replied.

"Oh......" Chen Zheng watched as those dark-skinned long-handed monsters held their scepters high, opening their mouths as if they were roaring something, and the zero crystals embedded in the cane also emitted a scorching light, shooting straight at the monsters with teeth and claws in front of them.

Chen Zheng focused on observing the monster, but the monster was covered in white paint that represented light, as if this was the only way to kill the monster.

Judging from the murals, they should be very productive in general - at least in terms of the costumes, which are very colorful, and the characters in different murals are dressed differently.

Generally speaking, the higher the level of civilization, the higher the standard of living. From this point of view, the civilization that left the murals should have also been glorious.

However, adding it up, Chen Zheng was surprised by what appeared on the picture - a thing with a carapace and tentacles, like a mollusk, covered with mucus and small bumps!

The appearance of this thing was exactly the same as the thing that ran out of Roshan's belly before, and because of the very obvious characteristics, Chen Zheng recognized it at a glance.

"Zero mail!? This must be zero delivery, right? Looking at the things on the mural, Chen Zheng whispered to himself in disbelief.

"Judging from the picture, the features are very remarkable, and it should be judged that it is the kind of zero mail that attacked us before."

The man with glasses pushed his glasses and leaned over to the screen to take a closer look: "This civilization ...... Let's take a look. ”

He seemed to be trying to draw some conclusions.

Chen Zheng didn't ask, and the searchlight continued to move along the cleared cave wall...... Next, I saw the crutch man fighting against Zero, the strong man with a big belly, and countless black-skinned long-handed people with pimples on their bodies like zombies.

When he saw this, Chen Zheng also had that idea in his mind - could this civilization be wiped out by Zero?

However, the murals on the walls were still very long, and Chen Zheng did not jump to conclusions, and continued to quietly watch the epic on the wall slowly open the next volume......

Really.

Zero-mail only caused chaos for a while in the early days of the long-handed and long-legged people, and soon they found a way to deal with zero-send - kill it quickly.

What followed were countless tragic strokes...... The parasite throws itself into the incinerator on its own initiative, and the combatants carry something similar to an incendiary bomb, which ignites immediately once they die, and dies with the monster!

The more Chen Zheng looked, the more fascinated he became...... He wanted to know what happened to the long-handed-and-long-legged man...... But the mural soon came to an end.

When the remnants of the long-handed-legged man killed the last infected old man with grief on their faces, the background, which had always seemed to burn with flames, turned into endless darkness.

Then, at the end of the darkness, dragon-like creatures flew out of the sky, obscuring the sky in huge numbers......

…… This is the end of the mural.

The artist's artistic level is very high, and in the last moments, darkness, depression and despair are simply on the page!

"So...... Did they fail? Chen Zheng's voice was a little hoarse.

“…… What I care about is, what are those creatures? The man in glasses looked worried.

"Is it symbolic?" Chen Zheng always felt that the painting of the "dragon" that covered the sky and the sun was a little too abstract, but it did not look like something that existed in reality.

"Not necessarily...... I think I've heard of this kind of thing somewhere...... Why can't you remember? The man with glasses held his head in thought.

Chen Zheng ignored him and motioned for the operator to continue driving. Suddenly, as if he had seen something, Chen Zheng quickly asked him to stop and move the searchlight back to the mural.

I saw that after the endless darkness, several small figures as small as matchsticks were walking into the underground and began to build in the underground world......

…… However, the mural came to an abrupt end here.

Unlike before, there are still traces of paint on the walls, but the little figures with realistic background colors and realistic brushstrokes are all half-finished, as if the work was stopped after a sudden change in the middle of the painting.

"......" Chen Zheng looked at the few brushes, and suddenly felt angry in his heart.

They ended up hiding in the underworld?

However, the current underground world is a nest of zero sends!

Then the fate of these long-handed and long-legged people is self-evident......

A strong, rich, sacrificial civilization was just wiped out!?

Chen Zheng silently adjusted the threat of Zero Dispatch to the highest level in his heart.

This thing must not be allowed to multiply!

Chen Zheng, who was determined in his heart, asked Explorer 3 to fetch the eggshell. As long as you take the eggshell and drag the wreckage of No. 1 back, today's exploration mission is over.

However, it is never that simple.

"Hey, those bugs are back...... Oh no! Oh, my God...... This! It's simply ...... Oh no......"

The driver who was next to him controlling Explorer 2 exclaimed.

Chen Zheng quickly turned around, but there was nothing on the screen, and Explorer 2 lost its signal again.

"What just happened!?" Chen Zheng grabbed the driver's collar.

"They...... They even eat metal!? It's terrible......" The driver rewinded the picture, and saw an overwhelming number of small insects rushing up, even blocking the light of the searchlight!

One of the small bugs that landed on the camera opened its mouth and gnawed at the screen......

Then, in just a dozen seconds, the sensors on Explorer 2 lost their signals one after another.