1. The gendarmes were unaware of the miner's digging. Reason: the miner disappeared after a conversation with a friend, so the gendarmes should not have known about his digging activities before.
2. The walls are deep and "seem" to be made of the same material as the underground rock, i.e., not necessarily the same material. In the manga, we know that the wall is the product of the giant's hardening, but the intelligence gives new information that the wall formed by the giant's hardening was so deep that the man dug for hours without seeing the head. The inference from this is that the giant didn't harden standing on the ground, or that this hardening is peculiar.
3. The miner's friend was not a spy sent by the gendarmes. At first, when I saw that "the miner entered the tavern with him naturally and spontaneously, after he had finished his work, and could not be said to have been invited by any party", I thought that the gendarmes had noticed and sent his friend to lure the miner into revealing his discovery, and thus arrested him. However, from the back of the information, the miner's friend "went to his house several times to see him" and "told the regiment of the cantonment everything, including the attempts made by the miner", indicating that the miner's friend was not a spy, but also an outsider to the incident.
4. Whether the miner was disappeared or realized that he had touched a taboo and escaped is not evident in the intelligence. "But even so, the miners did not continue to talk about the wall. If they had been overheard, the gendarmes would have found their heads in the twinkling of an eye." This shows that the miners already knew they had crossed the line and were afraid of being harmonized, so they no longer dared to say more. But then he added, "You're right, I'd better go on back to digging holes in the tunnels, and it turns out that in the end, this is better for me." Whether or not this was a genuine statement from Bean, or if it was meant for the scouts in the tavern (i.e., he was already preparing to leave the tavern and go off the grid, lest he be caught), see the analysis continued below.
5. For the above question we continue to look at intelligence. When the miner's friend realized that the miner disappeared, and told the cantonment regiment about it. We analyze: if the miner was in the tavern, because of the inappropriate words, by the cantonment regiment or gendarmerie arranged informants heard, or simply plainclothes heard, and then "disappeared", then there is no need to write: "the cantonment regiment and the gendarmerie began a large-scale joint search! ", or "It was somewhat of a publicity stunt to find the whereabouts of a poor miner - although he was a criminal who tried to dig his way through the walls". "
One possibility is that the Corps is trying to make a show of showing the miner's friends that your friend wasn't captured by me, and we don't know. But that analysis doesn't make sense. Because from the previous episodes, the Corps has a lot of power and the world inside the wall is not democratic. If it was really the Corps that captured the miner, the people from the Corps could have just arrested the miner's friend, and then this would have been treated as if it hadn't happened, and then went to arrest the people who might have heard it in the tavern, instead of sending so many people to find the miner himself.
The Corps' positivity suggests that they didn't originally know anything about what the miner said, and a more plausible explanation would be that they were afraid that the miner would find out something, spread it around, and run afoul of the King's government (since the Corps itself may have had no knowledge of the wall, but the King's government ordered that anyone spreading news of the wall be captured), or they were afraid that the miner would know something else and be used by the Giant's side, and that is why they a mind to capture the miners. But, in the end, the miner wasn't found and the miner's friend disappeared.
The important conclusion I draw from this paragraph is that the miner was not captured by the Corps. As for whether he was captured by Wang Zheng directly, it is not clear, but it is unlikely. Because it is not reasonable for Wang Zheng to arrange scouts directly inside the Wall of Rosse, and there is no need to set up a separate secret organization of this kind in order to catch wall knowers. Therefore, the miner is likely to be heard by a third party, the third party refers to the people who are interested in the wall.
6. Another place where the intelligence is very important is when it is written that the hole dug by the miners was not discovered by anyone. It has been stated above that the miners were not captured by the corps, and that the hole was so secret that the likelihood of the corps finding the hole was not high. So who filled in the hole?
In summary:
I. The information the miner has, and the information he accidentally blurts out in the tavern, is one and only one: the walls are deep underground, and "probably not the usual stuff". Other than that, the miner doesn't know any more about the walls than anyone else. And there's only one explanation I can come up with for the third party who could kidnap the miner away for that reason alone: he could only have been taken by someone who wanted to destroy the wall. To be precise, the "predecessors" of the two later Rainer Hoover.
It is also possible to draw another conclusion, which we already know from the comics: the giant side knew nothing about the wall before the miner incident. The human side of the King's government and the Order of the Wall knew something.
II. Based on one, it doesn't make sense that we know the wall wasn't destroyed in 784 after the miners were taken by the people who wanted to destroy it (or the giant side). My theory is that the people who kidnapped the miner asked the miner to take him to the digging site and saw the material of the wall with their own eyes, and since the giants knew what hardened skin looked like, they knew that the wall was hardened by the giants. But why the giant was not liberated from the wall after that is something to think about, and it is likely that even the giant did not dare to destroy the wall for some reason. But the giants have clearly come a long way from this, as evidenced by the fact that, in the manga's Prologue, a member of the bar noticed that the giants appeared within the walls for no apparent reason just a year after the miners' incident, and note that at this point in time, the walls weren't found to have been destroyed.
Finally, the key pieces of information that I have drawn from the intel are:
* The miners were taken away by spies that the giants had placed inside Ruth's Wall, not by the Corps.
* The disappearance of the miner's friends was done by the Corps.
* The Giant's side did not know the composition of the wall before the miners dug in. After this, the giants learned that the walls were formed by the hardening of the giants' skin.
* It is not known if the giants knew that the wall contained giants. But the giant must have gained useful information from the incident with the miners.
* Whether the miner was finally done away with or not, there is absolutely no way that he could have been the leader of the Cult of the Wall, as stated in the bar.
* The information provided by the intel about the wall itself is that the wall has deep roots, and that's the hardest thing to understand.