The equipment carried by Explorer 2 is all fixed-positioned. In addition to the ultrasonic detection system, what other systems can detect is only the direction they are facing. After all, the original design goal of Explorer 2 is just to explore caves.

Searchlights are no exception, and the direction they point is also fixed. So if you want to observe other directions, you can only rely on the operator to rotate the entire robot left and right.

The light beams emitted by the searchlight can only illuminate a small area in front of them, and the narrow field of view is full of large patches of darkness.

The potholes are covered with a thick layer of black substance, which looks very similar to fully fermented humus. As the tracks are crushed, sometimes some strange-patterned insect shells will be seen turning up from under the humus.

Explorer 2 staggered forward in the mud. Chen Zheng and the others did not choose to move forward in a straight line, but went forward against the right edge of the trumpet-shaped body - according to the "first law of the maze", touching the wall on the right or left hand side, you will definitely be able to walk to the exit.

Although the so-called "maze law" or "left/right-hand law" has no way to multi-dimensional and nested structures, it is still applicable to exploration at this time.

The edge of the hole wall slowly advanced for about ten minutes...

Sudden!

A trace of abnormality appeared on the cave wall!

"stop!"

With Chen Zheng's order, the operator subconsciously stopped Explorer 2.

"Hiss...what the hell is this place!?" Looking at the things on the screen, the man in glasses gasped.

Red and white paint can be seen faintly on the cave wall. Although the gray nets on it have been so dense that they almost cover up the entire wall, a clue can still be seen from the gaps between the stars...

...This is a giant mural!!

Is there really a civilization hidden underground here!?

Chen Zheng looked at the screen and said silently.

"Sir... are you going to continue?" the man in glasses approached Chen Zheng and asked carefully.

"Well, you guys continue first, if there is any abnormality, I will report it to me." Chen Zheng waved his hand and turned around and left the tent.

"Sir!" The man in glasses chased after him.

"Come on, too..." Chen Zheng thought for a while, waved to the man with glasses, "Let's go build a dust cleaning device... What do you think?"

"Ah!?This..." The man in glasses didn't keep up with Chen Zheng's thoughts. After being asked, he thought deeply, "How about a high-pressure air gun?"

"Well... dust will affect vision?" Chen Zheng said as he walked.

"Then add another suction device to filter out the dust."

"That's better to just get a vacuum cleaner..."

"Uh...what!?" The man in glasses was stunned. It was obvious that there was no word "vacuum cleaner" in his language.

"That's..." Chen Zheng described the characteristics of the vacuum cleaner.

"It's not impossible... But the stroke seems to be very high. If you make a 'vacuum cleaner', you can only use a sleeve telescopic structure. If you want the sleeve to extend high enough, the weight will be a problem... The strength of the existing material is insufficient, and the external bracket structure will also become very complicated..."

"You are right." Chen Zheng thought for a while and nodded in agreement, "But high-pressure air guns also involve high-pressure gas nozzles, right? Although they can be made shorter than the 'vacuum cleaner', if the mural is too high, the problem you are still mentioned."

"Well, that's right." The man in glasses frowned deeply, "Otherwise we would install the air pump directly on the robotic arm - the robotic arm does not have the problem of external support structure, and it can be made very high."

“…It’s not bad, just do it.”

After the two discussed the needs, they drove the Explorer 3 out and began to modify it according to the previous design.

Explorer 3 gave up life, ultrasonic and other detection devices, leaving only the video system and lighting system.

This time, the camera is loaded on a hemispherical "turret" that can be freely pitched and rotated by 360 degrees. The long lens of the camera becomes a "cannon barrel", and there are searchlights with higher power and variable focal length on both sides of the "cannon barrel".

Behind the "turret" are two long robotic arms, one of which is equipped with an "ion wind" generator. Although the so-called ion wind sounds very tall, in fact, it looks like ordinary metal cylinders.

The principle of the ion wind generator is very similar to a floating elevator, which uses electrical energy to generate 'electrical power' to generate airflow. After the ion wind generator was built, Chen Zheng specially tested it. Although it was less than the airflow intensity of the "high-pressure air pump", it was enough.

In addition to the No. 1 robot arm loaded with a "windrill", the number of folding layers of the No. 2 robot arm is slightly less, and the longest is no more than 3 meters. The top of the good robot arm is a "Y"-shaped claw structure.

When Explorer 3 has a "hand", it can not only collect specimens, but also drag the wreckage of Explorer 1 back.

Just as the two completed the transformation of Explorer 3, the man in glasses suddenly received a call from other researchers.

"Sir...you must take a look at this."

As soon as Chen Zheng entered the tent, a researcher came up and pointed to the screen and said.

"This is... eggshell!?" Chen Zheng looked at the gray-white oval sheet on the screen, and said incredibly surprised: "How could the bullet shell be of this shape!?"

“…”

There was a silence in the tent.

"How did you find this?" Chen Zheng pointed at the thing on the screen and browsed.

"That's right. Just after we left the mural, we saw a line of footprints... and then we followed the footprints and found these things."

As he said that, the screen of Explorer 2 rotated and aimed at other directions...

This is a small cylindrical space, with only the entrance and exit of Explorer 2 coming in.

In addition to the hole, this small space is filled with various carapaces... and they look very fresh!!

Some carapaces even have many traces of teeth gnawing!

"Are there any results for the analysis of these tooth marks?" Chen Zheng asked.

“Yes, here.”

As the researcher's actions, a report was sent to Chen Zheng's personal terminal. Chen Zheng was patient to look at the data and directly pulled the report to the bottom, and it said...

"...Such as a Homo sapiens from the Earth Family of Primates!?" Chen Zheng frowned at the final conclusion.

"Ahem... Damn it! What primate Homo sapiens... change them to Earthlings! No, change them to Great Earthlings!" The man with glasses flattered in a very clumsy way.

"... Just change it to Earthlings." Chen Zheng resisted the urge to roll his eyes.

"No. 2 continues to move forward, and two people are assigned to control No. 3."

"yes."
Chapter completed!