"Let's go!" Chen Zheng turned around and patted the pilot of Explorer 3, and ordered loudly:

"Before those things come, run quickly!"

"Yes!"

The driver also saw the replay just now, so he didn't dare to slack off, twisted the bar and reversed gear, and saw the explorer 3 turn around lightly and run away in the direction it came.

On the screen, the glow of a searchlight illuminates a small area in front of it. It's like turning on the low beam in a dark tunnel, and the whole world seems to be all that is left of yourself in the cab and a small piece of light in front of you.

The potholed ground was jolting, and from time to time insect shells that seemed to have grimaces carved on the ground floated on the ground......

"Wait...... What was that!? Chen Zheng said suddenly.

"What sound?" The glasses man and the others were originally nervously observing the picture around Explorer 3, and when they heard Chen Zheng say this, they suddenly didn't dare to come out, and they all held their breath and listened......

"Buzz ......"

"It looks like the sound of insects flying!?" The man with glasses frowned and stopped for a long time, and suddenly his face changed greatly, "Not good!" Look at the back! ”‘

Explorer III's camera jerked behind him, and the focus of the searchlight turned on to the farthest mode...... However, even so, it still does not shine through the darkness behind him.

“……”

"Buzz ......"

The sound is getting closer!

Suddenly! There seemed to be some small white dots flashing in the picture......

At this point, the camera and searchlights are turned to the rear, and the driver can only follow the 3D map drawn earlier, which does not show the wreckage of Explorer 1......

"Bump!"

"Hit something!"

The operator next to him quickly twisted the camera back, and saw that Explorer 1 had been corroded to the point that it was completely unrecognizable, and the green liquid on its body seemed to have become viscous!?

"Drag it back! Turn on the ion wind power to the maximum and blow it behind you! Chen Zheng ordered decisively.

"Yes!"

The operator was stunned before replying.

He wasn't to blame for this, the tense atmosphere made him forget that he was just operating a robot that could be discarded when he was old...... Compared to exploring the wreckage of One, this steel body is really nothing.

However, fortunately, I don't know if it was the ionic wind that made those vicious little things retreat, or because the temperature near the cave entrance was getting lower and lower...... All in all, they succeeded.

Explorer 3 dragged the remains of 1 and slowly moved through the tunnel...... The tension throughout the tent finally dissipated.

"What if...... I mean, if it's spring...... Do these little bugs fly out of their burrows? Chen Zheng asked.

“…… Definitely ......" The man with glasses was equally heavy-faced.

"......" Chen Zheng was silent.

He didn't go on to ask "do these bugs eat human flesh?" because he knew the answer was yes. Otherwise, the long-handed and long-legged people depicted in the mural would not have gone extinct.

"But it's not just the difficulties we're facing – judging from the murals, the planet seems to be very full of Zero Crystals." The man with glasses suddenly made a different point of view.

"If those people were destroyed by Zero, then those Zerocrystals must still be there. Zero-mail habits hoard zero-crystals ......"

"In other words......" Chen Zheng's eyes suddenly lit up, "As long as we break through here, we can get a large amount of zero crystals!?" ”

"That's usually true." The man with glasses didn't say anything.

Chen Zheng groaned.

Uncle Xia's research is nearing completion...... However, even if they understand the principle, it doesn't mean that Chen Zheng and their current level can be created.

Tidal gates involve a lot of strange elements, some unique structures that are difficult to process, and some parts have to be made of pure zero crystals.

It can be said that every tidal gate is made of countless zero crystals, and the little zero crystals hidden in Chen Zhengshu's cave are not even enough for fractions!

"At least threat and hope have become the same problem......" Chen Zheng rubbed his temples and suddenly felt a little headache.

I have the impression that tunnel operations are generally a matter of flamethrower sealing and blowing up the entrance. Occasionally, if you need a "deep clean", call for a Ground Penetrating Bullet or a Cloud Burst Bomb.

However, even in this kind of cleanup, the U.S. military during World War II still paid an extremely painful price, and it was not until the Japanese defending the bunker were bombed and surrendered by the "fat man" and "little boy" that the bunker problem was completely solved.

However, this did not give Chen Zheng any idea of how to solve the problem - he had neither a "big Ivan" nor a target for throwing cannons, and the insects in the ground would not surrender because of the threat.

Just as Chen Zheng was thinking about this, Explorer 3 returned.

When several people wearing hazmat suits and fully enclosed helmets saw the horror of Explorer 1 with their own eyes, everyone fell silent.

At this time, the metal on the body of Explorer 1 was already crispy, and with the vibration and slag falling down, the original solid support structure now seemed to be puffed food full of fine bubbles, and the slightest bump would break the whole root.

By this time, the green liquid had become very viscous, and its color had changed from light green to dark green.

“…… This needs to be sampled and analyzed...... Be careful, this thing can corrode all the glass......"

The man with glasses cautiously tried it with a long stick of different materials, and after finding that the green liquid could not corrode the resin, he handed a resin bottle to his assistant.

After that, sampling and testing were not mentioned, and those things couldn't help Chen Zheng.

He wondered how he could rid the cave of all threats. Although the current temperature conditions, the various creatures in the cave seem to be very uncomfortable, so even non-parasitic humans cannot be exposed to such temperatures for a long time.

However, one has to think a little bit long-term.

Winter will not always exist, although Chen Zheng has no meteorological data about the desolate star in his hands, but from the observation during this time, the minimum temperature every night has become higher and higher......

Spring doesn't seem to be far off......

……

“…… Stronger armor, corrosion resistance, flamethrower fuel, more power and detection equipment...... Is there anything else you would like to add? ”

The man with glasses recorded Chen Zheng's ideas for the new generation of "cleaner" robots in a small notebook.

"We also need to have a robotic arm, and we have to do sampling and analysis of each bug." Chen Zheng thought for a moment and added.

“…… Machine...... Weapons...... Arm ......" The man with glasses put the last item on the record.

"Tell me, what's wrong."

"Corrosion resistance can be solved with resin coatings, flamethrower fuel can be fueled with water and gas, and power and detection equipment are not a problem...... But there's not much we can do about it. ”

The man with glasses put away his pen and said, "The only metal material we can provide in large quantities now is copper, and most of the cemented carbide requires iron and titanium. Iron is good to say, as long as you find iron ore, you can refine it in large quantities...... But we don't have a good way to refine titanium yet. ”

"Hmm......"