Shi Lei must leave as soon as possible.

At eight o'clock in the morning, it is the time for the Parthenon to open, and when the time comes, there will definitely be a large number of tourists coming in, but Shi Lei does not know whether the exit of the underground palace will cause a lot of movement outside.

If there is no movement, of course, the best of both worlds, but if, as in the temple of Hephaestus, a large pit suddenly appears in the ground, it will be a big problem.

He had to open the exit of the dungeon to the ground before the visitors entered at eight o'clock, and then hide in the Parthenon, waiting for the tourists to enter and mingle with the tourists, before he could leave smoothly.

Or, Shi Lei had to wait until the Parthenon closed at eight o'clock in the evening before leaving. He couldn't open the passage from the dungeon to the Parthenon within these twelve hours, or else he would be left to be caught.

However, the oxygen here is obviously not enough for Shi Lei to support him for twelve hours.

And all this must be built on the basis of opening the door from here to the underground palace.

Only by opening the door of the dungeon can he find a way to leave, and even if he can't find a way out of the dungeon before eight o'clock, it doesn't matter, with the size of the dungeon, as long as Shi Lei is as careful as possible, presumably his qi cultivation should be enough for him to last until after eight o'clock in the evening.

He forced himself to calm down.

Shi Lei carefully analyzed the entire discovery in this room.

The pattern on the wall is the key to opening the door to the underground palace.

Those four potholes must be where the mechanism is located, and only by finding a way to get these four potholes can it be possible to open this stone door, enter the underground palace under the Parthenon, and then find the exit.

However, there were no buttons or anything else in these four pits, Shi Lei observed it several times, but he only saw that under the circular pit, there seemed to be an extremely narrow small hole connecting the inside of the stone gate......

Thoroughfare?

Is it to pour liquid into it?

Shi Lei stood up suddenly, and he remembered the lamp oil.

According to common sense, after a long period of time, and the air here is kept circulating, it should have evaporated clean.

Why has this oil been in the container beneath the oil lamp for hundreds of years?

Moreover, when Shi Lei used a flashlight to observe the lamp oil just now, he found that its reflective degree was quite high, at the beginning, Shi Lei almost thought for a moment that the container under the oil lamp was solid, and the lamp oil looked like a metal luster at first glance. However, he soon saw the lamp oil shaking in the container, and he was sure that it was lamp oil.

And now, the more I think about it, the more I feel that something is wrong, those lamp oils don't seem to be oil.

He walked to the wall on the right, took off the container under the oil lamp, and carefully shone it with a flashlight, the more he looked at the liquid, the more it looked like metal, and the viscosity alone was not as simple as ordinary lamp oil.

Shi Lei stretched out his finger and stained a little "lamp oil", this time, he found that it was not lamp oil at all, but mercury.

This is really Shi Lei's lack of experience, he has not seen much mercury, and the room is too dark, except for the flashlight in his hand, there is no light at all.

Moreover, under the oil lamp is lamp oil, which is almost an inherently inconvenient habitual thinking, and Shi Lei would never have imagined that the container under the oil lamp would contain mercury.

He went to the other side of the wall and removed the container, which was also filled with mercury.

An idea appeared in Shi Lei's brain, and by injecting this mercury into the holes in the four corners of the front wall, he might be able to open the door.

No matter what, time is not rich, Shi Lei must give it a try.

He immediately took a container of mercury and poured it into the two pits on the left side of the front wall.

Then, he quickly poured the mercury from another container into the upper and lower two pits on the right side of the front wall.

However, after the mercury was injected, there was still no movement in the room, and Shi Lei's attempt seemed to have failed.

This made Shi Lei very puzzled, under the oil lamp was mercury, and the mercury obviously could not light the oil lamp, which seemed to indicate that these mercury must be a means to open the mechanism. Otherwise, what do you want all this mercury for?

Now that the mercury has been injected into the pothole, and there is still no movement, what is wrong?

Just as Shi Lei was waiting for the changes in the room, he suddenly realized that these mercury were obviously not consumables, otherwise they would not always exist in this container.

He turned around sharply, and the flashlight in his hand shone at the oil lamp to his left, and he saw that mercury was already dripping from under the lamp.

Shi Lei rushed forward with an arrow step, lifted the container in his hand up, caught the dripping mercury, and then he quickly installed the container under the oil lamp, and quickly walked to the right, and also restored the container.

As time passed, Shi Lei finally heard the familiar clicking sound, which was the sound of the mechanism being opened and being activated.

Shi Lei breathed a sigh of relief, he understood.

Among the three walls, there is a special device that can only be touched when a liquid with such a dense density as mercury flows, otherwise it would not be possible to activate the mechanism even if the liquid is poured into these holes.

Moreover, there is another condition for the activation of the mechanism, that is, all the mercury contained in the container must flow back into the container.

That is, the person who enters here, has to put the container back in to carry the mercury.

When the mercury returned to the container through all the holes, the mechanism was completely touched.

At this time, Shi Lei had already seen that the front was taken out of the wall, and following the pattern pattern, the stone door slowly moved upward, and a door-shaped hole appeared in front of Shi Lei's eyes.

When all the movement stopped completely, Shi Lei returned to the oil lamp, took off a container and looked at it, and sure enough, it was filled with mercury again.

Moreover, with Shi Lei's sense of touch, which is now very sensitive to weight, he can judge that the mercury in this container is almost exactly the same as the weight just now.

Not daring to stay longer, Shi Lei walked quickly through the stone gate.

And when he completely passed through the stone gate, there was a clicking sound behind him again, and the stone gate slowly landed and returned to its original state.

Shi Lei glanced down at his feet, he was stepping on a huge stone slab with almost exactly the same pattern as the carved pattern on the stone door.

This stone slab is the same size as the stone gate, ten meters long and five or six meters wide, as long as a normal person, after stepping through the stone gate, it is almost impossible to step on other positions, and can only stand on this stone slab.

Shi Lei couldn't help but sigh at the ingenuity of the mechanism here.

First, the mercury is poured into the hole, and then the mercury must be completely returned to the container before the mechanism can be activated and the stone door can be opened.

And walking through the stone gate will inevitably make the mechanism be touched again and let the stone gate fall.

Shi Lei made a simple calculation, at the speed just now, probably after three or four people passed here, the stone gate was completely closed.

The first person walks on the stone slab will trigger the mechanism to close the stone door, and the next person must pass quickly, otherwise, the stone door can only be reopened.

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