It must be behind these three walls that there must be a larger underground palace, and in the underground palace, there is a place where the treasures are hidden.

Of course, there are not necessarily treasures, or perhaps this is just a refuge left by the ancient Greeks.

Of course, this is not the key, the big problem that Shi Lei found was because of the underground palace behind these three walls, but it was not quite.

Since there is a tunnel, the underground palace is not a particularly significant discovery, and the tunnel must be related to some special existence, otherwise what is the purpose of digging out this tunnel?

Of course, the tunnel may also be an escape route, or it may be a secret passage to connect the two places, but this is a temple, built for the gods to live, and the gods certainly don't need to escape, nor do they need to use the tunnels to secretly communicate the song.

But Shi Lei discovered the problem on the other side of the tunnel.

He carefully recalled the way he had come, and finally he found that his current position was in the belly of Mount Acropolis, and that it was located below the highest point of Mount Acropolis.

That is to say, it is located under the Parthenon.

The secret passage under the temple of Hephaestus, which is actually connected to the Parthenon, is a rather magical thing in itself.

Moreover, Shi Lei searched for three days in the temple of Hephaestus, and he was sure that this secret passage was excavated after the temple of Hephaestus was converted into a church. And that vault is where the pivot that controls the entrance is located.

This is the best way to keep the original appearance of the Hephaestus Temple as much as possible, but still be able to create such a tunnel underneath.

Shi Lei once again sighed at the ancient Greeks' generosity in architecture.

Now, all this is nothing, large excavators, and a variety of modern detection methods, can easily help an engineering team to do such a big project.

But more than 1,000 years ago, such a stroke was great.

And next, what Shi Lei needs to do is to crack the secret of these three walls, he must open these three walls in order to enter the underground palace behind him, and only then can he know why the architect made such a huge project to hollow out the interior of Acropolis Mountain.

At the same time, Shi Lei was also aware of his danger, because the way to open the passage from the belly of the Acropolis Mountain to the ground must also be behind these three walls.

He had to break through these three walls, otherwise he would have no way into the heavens and no way to enter the earth, and he would not be able to open the mechanism in the temple of Hephaestus when he retreated, and he would be blocked by these three walls in his way.

It's still a little too risky.

A thin layer of cold sweat oozed from Shi Lei's spine.

Without further ado, he began to study the three walls, believing that with his knowledge of mechanical applications, the knowledge of these mechanical applications given to him by the black card was completely beyond the level of earth technology in mechanical applications, and he would be able to find the secrets of these three walls.

It's really not good, he still has more than 24,000 prestige points, it's a big deal to exchange the mechanical application 2\5 to learn, but I don't know if to learn the second mechanical application card, whether Shi Lei needs to use those six sensory cards to develop his brain domain more.

Fortunately, with the previous experience, Shi Lei quickly found the possibility of opening these three walls.

On these three walls, there is a bulge on the left and right walls, and after Shi Lei illuminated it with a flashlight, he determined that they were two ancient oil lamps.

He looked at it, and there was still lamp oil in the container under the oil lamp, and when the flashlight shone through, it reflected the light brightly.

As a church, it has been five or six hundred years since the last moment, and the lamp oil here is still there?

Shi Lei didn't dare to light these two lamps, although it felt like there was air circulation here, but in case the air circulation was not enough to support him and the two oil lamps to consume oxygen at the same time, it would be troublesome. He had a flashlight anyway, and he didn't need the light of an oil lamp.

Trying to twist the oil lamp, Shi Lei wanted to see if the two oil lamps could be the mechanism, but the oil lamp itself did not move, only the container below seemed to be able to be removed.

Removed the container containing the lamp oil below, there was no change in the room, Shi Lei knew that the mechanism should not be on the two oil lamps.

He walked to the front wall again, and he found that there were some lines left on the wall, and when Shi Lei entered here from the main hall before, its opening was opened from the lines. It's just that I don't know what means the ancient Greeks used, and those lines were so tightly knit that there was no gap at all.

The lines on these three walls are similar to those on the floor in the temple of Hephaestus, and form a rectangle, as if they were the shape of a door. This seems to reinforce the fact that as long as there are pathways behind these three walls, then these lines must be the key.

Shi Lei carefully searched for it in this trapezoidal room, and did not let go of every inch of position, but he didn't find anything except for the four circular potholes on the left and right corners of the front wall.

Shi Lei realized a possibility that these four pits were likely to be the switches that controlled the door of the dungeon, but perhaps it would take four people to resist these four holes at the same time to open the gate.

If that's the case, then it's a cheat, Shi Lei calculated everything, everything was right, but he didn't count that he was only one person.

He tried to touch the craters one by one, trying all the order possibilities, and the three walls were still the same, nothing changed.

How can this be?

Shi Lei couldn't help but be a little flustered, he could even feel that the oxygen in the room was decreasing, and the air circulation here was based on some kind of principle, it seemed that since he came in, the air here was no longer circulating.

Perhaps, this is the insurance set up by the ancient Greeks to prevent anyone from discovering this place.

If the tunnel is opened from the outside, and when the person enters, the air circulation will be closed until the person passes through the chamber and enters the underground palace beneath the Parthenon. Only in this way can it be completely determined that the person who enters the passage knows the secrets here.

And if an outsider breaks in, he will be suffocated here because the air is not enough and the door of the underground palace cannot be opened.

This is really a big deal, Shi Lei didn't see any bones at all along the way, he subconsciously thought that there would be no danger here.

However, no one died here, and there is a possibility that it was never discovered by anyone.

No one found out, so naturally no one broke into this place.

And if there has been no break-in, how can anyone die here?

Shi Lei felt a little sad, could it be that he would be the first person to die here?

No, Shi Lei warned himself that he had to calm down, there must be some kind of mechanism here to let him leave, otherwise, all this ingenious design would be useless.

Shi Lei simply sat down on the ground to try his best to calm himself, so that his need for oxygen would be much smaller.

He carefully recalled every discovery he had made here, although it was true that it would take at least four people to work together to open this door, but it was also possible that Shi Lei had not really discovered the mystery of this underground palace door.

There was less and less oxygen in the room, Shi Lei glanced at his watch, and at seven o'clock in the morning, he entered this tunnel, and more than two hours had passed.

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