Shi Lei must leave as soon as possible.

At 8 o'clock in the morning, it is the time for the Parthenon to open. At that time, a large number of tourists will definitely come in. However, Shi Lei did not know whether the opening of the underground palace would cause a lot of noise outside.

If there is no movement, of course 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 from the underground palace to the ground before tourists enter at 8 o'clock, and then hide in the Parthenon. Only when tourists enter and mix in with the tourists can they leave smoothly.

Or maybe Shi Lei must wait until the Parthenon is closed at 8 o'clock in the evening before leaving. He cannot open the passage from the underground palace to the Parthenon within these twelve hours, otherwise, there will be only one way left to be captured.

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

All of this must be based on opening the gate to the underground palace here.

Only by opening the gate of the underground palace can he find a way to leave, and even if he cannot find the way to go out of the underground palace before 8 o'clock, it doesn't matter. As for the size of the underground palace, Shi Lei should be as careful as possible, and he must be able to nourish his energy until after 8 o'clock in the evening.

He forced himself to calm down.

Shi Lei carefully analyzed the entire discovery in this room.

The patterns on the walls are the key to opening the gate of the underground palace.

Those four pits must be where the agency is located. Only by finding ways to solve these four pits can we open the stone door, enter the underground palace below the Parthenon, and then find the exit.

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

Channel?

Is it necessary to pour liquid into it?

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

According to common sense, lamp oil has been evaporated for a long time and the air here is kept circulating.

Why have these lamp oils been present in containers under the oil lamps for hundreds of years?

Moreover, when Shi Lei used a flashlight to observe the lamp oil, he found that its reflection level 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.

Now, the more I think about Shi Lei, the more I feel 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 shone it carefully with a flashlight. The more he looked at the liquid, the more he looked like metal. The viscosity was not as simple as ordinary lamp oil.

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

Shi Lei has no experience. He has never seen mercury much. In addition, the room is too dark. Except for the flashlight in his hand, there is no light at all.

Moreover, there is lamp oil under the oil lamp, which is almost an inconvenient habitual thinking. Shi Lei never expected that the container under the oil lamp would contain mercury.

He walked towards the other wall and took off the container, which was also filled with mercury.

A thought appeared in Shi Lei's brain, injecting this mercury into the pits in the four corners of the front wall, perhaps opening the door.

No matter what, time is no longer rich, Shi Lei must give it a try.

He immediately took a container of mercury and injected the mercury inside into the two potholes on the left side of the front wall as evenly as possible.

Then, he quickly injected the mercury from another container into the two upper and lower 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. Below the oil lamp is mercury, and mercury obviously cannot light up the oil lamp. This seems to indicate that these mercury must be a means to turn on the mechanism. Otherwise, why do you need these mercury?

Now that the mercury has been injected into the pit, there is still no movement. Where is the error?

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

He suddenly turned around and the flashlight in his hand shone at the oil lamp on the left. He saw that mercury had begun to drip down from the oil lamp.

Shi Lei rushed forward with a quick step, lifted the container in his hand up, and caught the dripping mercury. Then, he quickly installed the container at the bottom of the oil lamp, and quickly walked to the right, and restored the container.

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

Shi Lei breathed a sigh of relief, he understood.

There is a special device among the three walls. Only when a liquid with a very dense density of mercury flows through it can the mechanism be touched. Otherwise, even if liquid is poured into these holes, the mechanism cannot be activated.

Moreover, there is another condition for starting the mechanism, that is, all the mercury loaded in the container must be flowed back into the container.

That is, those who enter here must reload the container to carry the mercury.

Only when the mercury passes through all the channels and returns to the container, the mechanism is completely touched.

At this time, Shi Lei had already seen the front wall and follow the pattern of the stone door slowly moving upwards. A door-shaped hole appeared in front of Shi Lei.

When all the movements stopped completely, Shi Lei returned to the oil lamp, took off a container and looked at it. It was indeed full of mercury again.

Moreover, with Shi Lei's current sense of weight, he could tell that the mercury in this container was almost exactly the same as before.

Not daring to stay for a long time, Shi Lei quickly passed through the stone gate.

When he completely passed the stone gate, there was another crackling sound behind him, and the stone gate slowly landed and returned to its original state.

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

This stone slab is about the size of the stone gate, ten meters long and five or six meters wide. As long as a normal person is almost impossible to step on other positions after crossing the stone gate, 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 infused with the hole, and then the mercury must be completely returned to the container before the mechanism can be activated and the stone door is opened.

When you walk past the stone gate, you will inevitably be touched again and cause the stone gate to fall.

Shi Lei simply calculated that at the speed just now, about three or four people passed by here, the stone gate was completely closed.

The first person walks onto the stone slab will trigger the mechanism to close the stone door. The person who comes afterwards must pass quickly, otherwise, he will have to open the stone door again. 8)
Chapter completed!