As long as this tunnel exists, slipping in without anyone knowing is absolutely easy; you could even say, without the slightest exaggeration, that even if the two of them swaggered right in, those Guards still wouldn’t notice a thing.

Not only that, even if those Guards really did run into this old man, they wouldn’t dare believe he actually came back—and came back while they had the place tightly surrounded. That would be enough to make jaws hit the floor, something people simply wouldn’t dare believe or even imagine.

Besides, what these people were guarding wasn’t whether this old man could come back at all, but whether his family might slip away, or whether there was any chance of inside-outside collusion.

Once he thought of the tunnel, the old man immediately quickened his pace, leading Lin Yi through several twists and turns straight to a very inconspicuous civilian house.

Looking at this house, Lin Yi couldn’t help giving the old man a thumbs-up. Well now, this old man really had thought things through.

The location of this house was actually quite far from the old man’s Grand General’s Mansion; you could say without any hesitation that almost no one would think of this, and no one would guess there was a tunnel hidden here. And the amount of work this took definitely wouldn’t have been small.

After all, with such a long distance, digging a tunnel through is no easy job. At the same time, it also shows just how prominent this old man’s status is in Zhao Country, and how brilliant his methods are.

Being able to pull off such tricks right under the Emperor’s nose is enough to prove this is definitely not some simple character.

However, what Lin Yi hadn’t expected even more was that there were actually people living in this house, and the old man just went up and knocked, then walked right in.

When he saw the people who opened the door, Lin Yi couldn’t help giving the old man another thumbs-up. If this place had been empty, someone might really have started suspecting something, but now, seeing an old man and an old lady opening the door, this obviously wouldn’t arouse anyone’s suspicion.

Moreover, when the old man and old lady saw the Grand General, their faces didn’t show the slightest panic or surprise; they were that calm, as if this were the most natural thing in the world.

Only after the two went inside did the old man quickly close the door.

However, the tunnel wasn’t out in the open either; after entering the house, they headed straight toward a well.

"The entrance is here, this well."

Seeing this well, Lin Yi couldn’t help feeling a bit puzzled. The well didn’t look particularly deep; when he looked down, he could even see the water inside.

Yes, this was not a dry well, but a well with very clear water.

Even if you lay on the edge of the well and looked down, you wouldn’t find anything unusual.

This made Lin Yi all the more curious.

The well didn’t look suspicious at all. Could it be that this guy actually put the tunnel entrance at the bottom of the well?

But obviously that wouldn’t work. If the entrance was at the bottom, what about the water? The water would naturally pour in.

And the tunnel, by definition, runs underground. Exactly because of that, if the water level in the well is higher than the tunnel, the well water will continuously flood into the tunnel, turning the entire tunnel into something like an underground river.

Precisely because of this, it’s an extremely difficult thing to pull off. Let alone in ancient times; even in a modern society with advanced equipment, it wouldn’t be easy.

Of course, unless you use the terrain, with the well’s water diverted at a higher point, making a bend—in other words, using a higher field to block the water from flowing into the tunnel. At that point, you’d just need to dive into the water, swim to that exit, and you could enter the secret chamber inside.

You’ve seen this mechanism before, and personally broken through it.

Yes, it was the same setup Chen Baicheng used back then.

That secret chamber was beneath a lake; the way it was built was extremely clever, using the space inside an artificial hill to carve out an entrance from underwater.

But looking around here, this is the Capital City. In a place like this, don’t mention mountains—there aren’t even any buildings tall enough to rely on.

Because of that, trying to pull off what Chen Baicheng did before is clearly completely unrealistic.

Apparently seeing Lin Yi’s confusion, the old man couldn’t help letting out a "hehe" and finally revealed a hint of smugness.

He couldn’t help it—Lin Yi had always been suppressing him; after all, Lin Yi’s status was right there.

But now he actually saw something Lin Yi didn’t understand—how could that not excite the old man?

He had only just started to get excited, and before he could even open his mouth, he saw Lin Yi suddenly leap straight into the well.

With a splash, Lin Yi’s whole body went straight down to the bottom, and at the same time, Iron Man Battle Armor appeared over him.

This was just Lin Yi’s personality: when he runs into something he doesn’t understand, he has to check it out himself. If there really is a secret chamber or a hidden passage under the water, wouldn’t he know as soon as he jumped down and took a look?