As for the other space buttons, they are merely technologies developed using the space of 'Shadow', and their space is much smaller than that of 'Shadow'.

Moreover, how many "Shadows" the Interstellar Federation has discovered in total and how many "Shadows" it has actually captured is not information that Lin Tao can obtain.

One thing is certain, there are two types of items that can capture "shadows", Shadow Prison Stone and Shadow Forbidden Stone.

In the later period of the Great War, as the Interstellar Federation discovered planet after planet and the existence of space creatures, a special material called "strange object" appeared in the space.

These are materials that can only be found in the starry sky or on some special planets.

As more and more "strange objects" appear, there are also many things similar to the Shadow Prison Stone and the Forbidden Shadow Stone. If it were just some commonalities, it would be impossible to distinguish the real Shadow Prison Stone and the Forbidden Shadow Stone.

After all, there are many similar strange things in the vast universe.

In order to better distinguish between the Shadow Prison Stone and the Forbidden Shadow Stone, the people of the Interstellar Federation created the 30&15 judgment criteria specifically for identifying these two kinds of rare objects.

The so-called Thirty Judgment Method is used for the Shadow Prison Stone. Once the Thirty Judgment Method is passed and the true form of the Shadow Prison Stone is confirmed, the Fifteen Judgment Method will be used again to judge the Forbidden Shadow Stone.

Only when both are passed can the existence of Shadow Prison Stone and Forbidden Shadow Stone be proved.

If you make a mistake in identification, then when you capture the 'shadow', you will be affected by the 'shadow's' special ability and disappear forever in the 'shadow's' space.

Among the fifteen methods of judging the Forbidden Shadow Stone, one of them is its ability to charge electronic devices.

That's why Lin Tao asked back immediately after hearing Zheng Xun's words. After getting confirmation from Zheng Xun, he quickly asked, "Did you salvage anything?"

"Yes, there are two deep-sea robots. One of them is holding green stone powder that has not been broken yet, and the other is holding a light blue stone that looks like some kind of ore."

Before Zheng Xun even uttered the word "ore", Lin Tao was already overjoyed: "Wait for me there right away and put that thing away carefully for me."

After saying this, without waiting for Zheng Xun's response, Lin Tao cut off the communication and then called the aerospace spacecraft over.

The aerospace spacecraft was very fast and brought Lin Tao to the vicinity of the Dead Sea in a short time.

Ziz! After the spacecraft landed, the hatch opened and Lin Tao almost ran out.

As soon as he appeared, Lin Tao found that Zheng Xun had come to him, holding two wet cloth bags that were dripping with water.

"Brother Lin, these are what the deep-sea robot brought back." Zheng Xun held up two wet cloth bags in front of Lin Tao.

"Okay." After Lin Tao said okay, he immediately took it and ran back to the laboratory of the aerospace spacecraft.

Zheng Xun followed behind, thought for a moment, and then stopped, because if Lin Tao wanted to find him, he could use the watch to communicate at any time, and Lin Tao's laboratory was a place that only a few people could enter, and these people did not include him.

Thinking of this, Zheng Xun returned to the Dead Sea and waited for news.

After returning to the laboratory, Lin Tao couldn't wait to open the two bags. Each bag contained a stone. One was the size of a human head and glowed green. This was exactly the original appearance of the green stone powder that Zheng Xun and others had mentioned.

After using the incomplete thirty-judgment method, Lin Tao tentatively determined that this was the Shadow Prison Stone. However, this was the first time he had seen such a complete Shadow Prison Stone.

The other bag was a bag the size of two fists, with an uneven surface and filled with light blue stones.

Lin Tao's eyes tightened, and the memories in his mind suddenly opened up. This was most likely the Forbidden Shadow Stone that existed near the Shadow Prison Stone.

However, at this moment, the Shadow Prison Stone has not been completely judged by the Thirty Methods. It is just Lin Tao's determination in his heart. Therefore, for this newly discovered light blue stone, Lin Tao still needs to judge it again to avoid mistakes.

You know, 'Shadow' has the ability to swallow all living things into another space. If these two things make a wrong judgment, then death will greet him.

Although Lin Tao has died once, he doesn't know whether his soul will travel through time and space again after dying again like this time.

But no matter what, Lin Tao still planned to avoid it as much as possible.

The laboratory was filled with fixed bottles and jars, which contained various materials that Lin Tao had collected from Xin Ya.

There are thirty methods of identification, but Lin Tao cannot complete them all, as some of them are rare objects that have not been discovered yet. As for the fifteen methods of identification of the Forbidden Shadow Stone, only three of them are rare objects that have not been discovered yet, so in this process, Lin Tao can only conduct twelve tests on it.

After discovering the Shadow Prison Stone, Lin Tao made a list of all the materials required for the twelve tests and asked Xin Ya to help collect them all on Mingyuan Star.

Take out the prepared materials one by one.

Lin Tao scraped some of the light blue stone off and divided it into twelve parts, which he put into the test tubes that had already melted into liquid.

Twelve tests were carried out simultaneously, which was somewhat difficult for most people, but for Lin Tao, as long as he could remember the entire process, he would be able to distinguish them bit by bit in his recollection.

The whole process was extremely short and was completed almost in the blink of an eye.

After the test, Lin Tao sat where he was, and with his photographic memory, he carefully recalled the conditions of each test tube.

There was no need to test the energy source, but Lin Tao still did it. The test showed that the Forbidden Shadow Stone had the property of slowly restoring the energy block.

Putting aside other things, this characteristic alone has played a huge role for Lin Tao.

Once this substance is infiltrated into the energy block, the energy block can be reused, allowing the mecha to have a longer endurance without replacement.

After everything is completed, be sure to notify Zheng Xun and ask him to change the instructions of all deep-sea robots so that they can bring back this light blue stone specifically.

The light blue stone passed all twelve tests, which covered a variety of different properties.

After recalling again and again, he still got the same answer. Lin Tao let out a long breath, stood up, and picked up the light blue stone that was soaked by sea water.

"The Shadow-Forbidden Stone." Lin Tao said in a calm voice.

Having said that, Lin Tao only conducted an incomplete thirty-test method on the Shadow Prison Stone, and twelve tests on the Forbidden Shadow Stone. Just like this, he cannot be 100% sure that this is the Shadow Prison Stone and the Forbidden Shadow Stone.

There are many strange things in the starry sky, and there are many resources similar to these two substances.

However, Lin Tao could no longer wait, as he urgently needed these two resources, because once the matter on Mingyuan Star was settled, he planned to go to the Interstellar Federation in person.

This time, without the space button, he would not be able to bring the mecha with him, and the environment also prohibits him from carrying the mecha with him. Once he encounters an attack from a wealthy family, it will be extremely disadvantageous for him.

In this era, the power of mecha is ultimately stronger than personal strength.

Although Lin Tao was able to seize the opponent's machine in the battle, before he could enter the cockpit, the opponent decisively gave a death order and ordered someone to forcibly blow up the machine, so his method was no longer effective.

Thinking of this, Lin Tao sighed again.

He clicked on the communication, found Zheng Xun's number, and called him.

"Brother Lin, what about those two stones? Are they what you are looking for?" Zheng Xun asked the first time.

Lin Tao did not answer, but asked: "Zheng Xun, how many deep-sea robots are there on the shore now?"

"Hmm?" Zheng Xun was stunned for a moment, then thought for a while and immediately answered, "Brother Lin, we only prepared a hundred deep-sea robots at the beginning. Some time ago, nearly half of them helped to salvage the body of Kongli near the coast. In addition, some of them fell into the deep sea and could not come back. Now there are only about 60 to 70 deep-sea robots that can be used."

Sixty or seventy? Just barely, but still okay.

"By the way, can the body of Kongli that has been salvaged now meet the needs of Department Head Tian Zhi?" Lin Tao asked suddenly.

Zheng Xun has some say on this issue, as he has been monitoring the situation on both ends.

"We only need to leave twenty deep-sea robots here to cope with the situation." Zheng Xun replied.

The chips brought from Bai Fan are limited, so Lin Tao cannot add any new deep-sea robots. However, if he removes another twenty, the remaining deep-sea robots should still arrive in time if used properly.

"Leave twenty deep-sea robots to salvage Kongli's body, and the rest will all move to the location where the light blue stone was salvaged before. We must salvage ten cubic meters of that ore in the shortest time possible." Lin Tao said in a serious tone.

"Specializing in salvaging those light blue stones?" Zheng Xun was stunned.

"That's right, specifically salvage the light blue stones. After they are salvaged, hand them over to Peng Haokong immediately. He will come to me." Lin Tao ordered again.

Hearing this, Zheng Xun's eyes flickered.

Zheng Xun had heard some rumors about Peng Haokong. This guy was born in the First Mecha Academy of Mingyuan Star. Not only did he participate in the design of the improved version of Tianjia Shenjiang, he was also an expert in mecha energy research. Just like the energy block used by K223 this time, it was made by him alone.

Looking for Peng Haokong?

Zheng Xun's heart moved. Could it be that this light blue stone could extend the battery life of the mecha?

Thinking of the two deep-sea robots that suddenly returned to the surface of the sea, he felt as if he was wondering, if this was true, then he had discovered something extraordinary.

"Okay, Brother Lin, I'll arrange it right away."

After the call was disconnected, Zheng Xun immediately arranged everything for the deep-sea robot.

It’s a little late today...