Chapter 1215 Perfect Mechanism

Shi Lei must leave as soon as possible.

At eight o'clock in the morning, the Parthenon will open. At that time, there will definitely be a large number of tourists coming in. However, Shi Lei does not know whether the opening of the exit of the underground palace will cause a big commotion outside.

If there is no commotion, of course, it is the best of both worlds, but if a big pit suddenly appears on the ground like in the Temple of Hephaestus, it will be a big trouble.

He must open the exit connecting the underground palace to the ground before the tourists enter at eight o'clock, and then hide in the Parthenon, wait for the tourists to enter, and mix with the tourists, so that he can leave smoothly.

Or, Shi Lei must wait until the Parthenon closes at eight o'clock in the evening before he can leave. He cannot open the passage from the underground palace to the Parthenon within these twelve hours, otherwise, the only way left is to be caught.

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

And all this must be based on opening the door to the underground palace.

Only by opening the door of the underground palace can he find the passage to leave. Even if he can't find the passage to leave the underground palace before eight o'clock, it doesn't matter. Given the size of the underground palace, as long as Shi Lei is as careful as possible, he should be able to maintain his energy until after eight o'clock in the evening.

He forced himself to calm down.

Shi Lei carefully analyzed the findings in this small room.

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

The four holes must be the mechanism. Only by finding a way to deal with these four holes can it be possible to open this stone door, enter the underground palace under the Parthenon, and then find the exit.

However, there are no buttons or anything else in these four holes. Shi Lei observed several times and only saw that there seemed to be a very narrow small passage under the circular hole, connecting the inside of the stone door...

Passage?

Is it to pour liquid into it?

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

According to common sense, the lamp oil should have evaporated after a long time, and the air here is kept flowing.

Why has the lamp oil always been in the container under 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 reflectiveness was quite high. At the beginning, Shi Lei almost thought that the container under the oil lamp was solid for a moment, and the lamp oil looked like the luster of metal at first glance. However, he soon saw the lamp oil shaking in the container, and he confirmed that it was lamp oil.

And now, the more Shi Lei thought about it, the more he felt something was wrong. The lamp oil did not seem to be oil.

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

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

This was really because Shi Lei had no experience. He had never seen mercury. In addition, the small room was too dark. Except for the flashlight in his hand, there was no light at all.

Moreover, there was lamp oil under the oil lamp, which was almost an inherent inconvenience of habitual thinking. Shi Lei never thought that the container under the oil lamp would be filled with mercury.

He walked to the wall on the other side and took down the container, which was also filled with mercury.

An idea came into Shi Lei's mind. If he injected the mercury into the holes in the four corners of the front wall, he might be able to open the door.

In any case, time was running out, and Shi Lei had to give it a try.

He immediately took a container filled with mercury and injected the mercury into the upper and lower holes on the left side of the front wall as evenly as possible.

Then, he quickly injected the mercury in another container into the upper and lower holes on the right side of the front wall.

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

This puzzled Shi Lei. There was mercury under the oil lamp, and mercury obviously could not light the oil lamp. This seemed to indicate that the mercury must be a means to open the mechanism. Otherwise, what was the use of the mercury?

Now the mercury has been injected into the pit, but there is still no movement. What went wrong?

Just as Shi Lei was waiting for the changes in the small room, he suddenly realized that the mercury was obviously not a consumable, otherwise it would not have been in this container all the time.

He turned his body suddenly and shone the flashlight in his hand towards the oil lamp on the left. He saw that mercury had begun to drip from the bottom of the oil lamp.

Shi Lei rushed forward, lifted the container in his hand up, caught the dripping mercury, and then quickly installed the container under the oil lamp, and quickly walked to the right and restored the container in the same way.

As time passed by, Shi Lei finally heard the familiar click sound, which was the sound of the mechanism being opened and started.

Shi Lei breathed a sigh of relief, he understood.

There was a special device in the three walls. Only when a liquid with a very high density, such as mercury, flowed through, could the mechanism be triggered. Otherwise, even if liquid was poured into these pits, the mechanism could not be started.

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

That is, people who enter here must put the container back in to carry the mercury.

When the mercury passes through all the channels and returns to the container, the mechanism is completely triggered.

At this time, Shi Lei has seen that the stone door on the front wall moves slowly upwards along the pattern, and a door-shaped hole appears in front of Shi Lei.

When all the movement stops completely, Shi Lei returns to the oil lamp, takes off a container and takes a look. It is indeed full of mercury again.

Moreover, with Shi Lei's sensitive sense of weight, he can judge that the weight of the mercury in this container is almost exactly the same as before.

Not daring to stay for long, Shi Lei quickly passed through the stone door.

When he completely passed through the stone door, there was a click sound behind him again, and the stone door slowly fell down and returned to its original state.

Shi Lei looked down at his feet. He was standing on a huge stone slab with almost the same pattern as the one carved on the stone door.

This stone slab is the same size as the stone door, ten meters long and five or six meters wide. After crossing the stone door, any normal person can hardly step on other places and can only stand on this stone slab.

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

First, the mercury is poured into the channel, 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 door will inevitably trigger the mechanism again, causing the stone door to fall.

Shi Lei simply calculated that at the speed just now, the stone door will be completely closed after about three or four people pass through here.

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

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