The black water in the canal is not sewage, but a pure black liquid with a density lower than water, which does not smell of sewage at all, but exudes a smell of benzene.

At first, we all thought it was crude oil, but we lit it with a lighter, but found that this black liquid could not be ignited at all.

The old wolf and Lilith, who had always seen a lot of vision, also had a hard time, and bluntly said that they had never seen anything like it.

The others gathered together and whispered about what the black water was, while I sat next to the black water canal, thinking about what to do next.

Since we came ashore, we have walked around the whole town, and we have not found any machine used to punch holes in the land, so how did the underground pipes used to walk the black water get buried in the ground?

If this official road is only seven or eight meters deep, I can still believe that it may be all about manually drilling holes and then burying the official road into them, but the problem is that the length of this pipe is at least 20 meters or more, and you have to have such a long cone to make such a deep hole by hand.

It is impossible to make a hole, so you can only dig a relatively large pit that people can drill into, and then bury the pit after the pipe is stable, but in that case, it will inevitably destroy the surrounding surface.

Here's the biggest problem.

The floor tiles laid in this area are older than the Black Aqueduct itself, which can be seen by the degree of wear and tear of the slates, and the shape of the slabs is intact, except that they are badly worn, at least they have not been damaged.

Of course, it is possible that the locals first pried out some of the floor tiles intact, and then dug a large pit in the ground and buried the pipes vertically.

But there is another possibility.

That is, this pipe was originally driven from the ground upside down, in other words, deep underground, there is likely to be a large space that can accommodate adults to work in it, and the distance between this space and the surface is not too far, at most five or six meters apart, otherwise it is difficult to penetrate.

If this is the case, only a small part of the pipe is embedded in the soil, and most of it is exposed in a large underground space, and the height of this underground space is at least about fifteen meters.

Such a large space is likely to be a grotto or tomb excavated by individuals, and the possibility of natural karst caves is not very large, if there is a large karst cave underground, with the geological structure here, it may not be able to withstand the weight of so many masonry buildings.

You might say that maybe the people in the town hired machinery from outside to punch holes, and when they were done with it, they shipped it out, but I can responsibly say that there is no such possibility at all.

The town is surrounded by walls on all sides, except for the dark passage we walked through earlier, only a two-meter-square tunnel has been opened in the north wall, although I have never seen a machine to drill holes in the land, but I guess that to dig such a deep hole, it must require large equipment, but the tunnel entrance is too small, small cars may be able to drive in, large machinery is not at all.

But I just thought about it in my heart, and I didn't say it.

Because from the beginning to the end, Monceau did not say that there were grottoes or tombs under the town, either he did not know about the stubble, or he deliberately concealed this information, or or, I guessed wrong, there were no grottoes and tombs at all.

But in either case, it doesn't make any sense for me to say what I think, and if I don't get it right, it will cause Monceau.

I patted my knee and slowly stood up.

When the others heard my leg slapping, they stopped their discussion and looked at me in unison.

I turned to them and asked in a very calm tone, "Where did you say the people of this town had gone?" ”

I said this by looking at Lu Shengcai, but in fact, my attention was on Monceau.

Another important reason why I think there's a big space underground, is that unless there's a space where you can hide the whole town, you can't explain where they've gone.

Indeed, I also thought that these people might have left the tunnel on the north wall, but if I think about it, there is also a relatively large puddle near the north wall, which is full of water, but when I shine a flashlight into the tunnel, I see that the tunnel floor is completely dry, and there is not a single wet footprint.

If a large number of people walked through the tunnel, the water they brought with them on their feet would have soaked the entire tunnel floor, and the dampness in this area was very heavy, and the floor tiles did not dry so quickly, but the tunnel floor was indeed dry at that time, which means that it has been abandoned for a long time, at least in the last few days.

So, will the people in the town get out over the wall?

If you are sick, put a good tunnel and don't go, what do you do over the wall.

I noticed the expression on Monceau's face, but he was just a little puzzled, as if he couldn't understand what I was asking again, because it was a question that could not be inferred and discussed.

He is not a person with superb acting skills, and this kind of expression will never be faked.

Could it be that he really didn't know that there was a big space underground, or did I really guess wrong?

Lu Shengcai pondered for a long time, and suddenly responded: "You want to murder my brain cells again!" Damn, you can't even figure out this kind of thing, how can I figure it out! ”

I was observing Monceau's performance, but I didn't expect to be beaten in vain, and my heart suddenly felt a little stuffy, but it was not easy to show it.

After a brief moment of silence, I beckoned everyone to leave the Black Water Canal and go back to the town to investigate the situation.

I vaguely remember that when I was walking around the town before, I seemed to see several houses with no lights, but because my mind was on the dark alleys on the side of the road, the strange smell that had filled the air, I didn't really remember it clearly.

Right now, I want to go back and confirm whether my memory is correct, and by the way, see if there are any strange corpses in this town whose eyes have been replaced.

It turns out that sometimes, those seemingly unreliable memories can actually give you some key clues.

In the four positive directions of the town, as well as the northeast, northwest, southeast, and southwest corners, there is a small building that is not lit.

Each female corpse died in exactly the same way, with fresh wounds that did not bleed, both eyes were replaced, and all the false eyes were also buried with centipede-like Gu worms, and what was even more strange was that these women were all wearing the same style of long skirts, even their ages and hairstyles were similar.

I think Lilith should be right, it's some kind of ritual.