The two suddenly glanced at each other, and they both saw the complicated expressions in each other's eyes. It stands to reason that these wild tomb robbers would not be so kind as to close the coffin, and they should not have done it.

The two men agreed that even if they wanted to stay here and observe, they would have to open the stone door to circulate air. So they went around the other two coffins and came to the stone gate.

Two meters to the right side of the stone gate, there is a gap with a large amount of slime. It turns out that this giant slug monster came in from here.

Zhang Wei was responsible for priing open the door with a hand axe and a dagger, while Luo Yuanhao went to observe the gap to see if there would be any monsters coming out, so as to prepare early.

Using a headlamp and a mobile phone to illuminate together, I found that the hole was winding and invisible, and I couldn't see it from three meters away, so I had to give up.

As soon as he turned around, he saw that Zhang Wei couldn't pry the stone gate no matter what, and it seemed that it was difficult to get out of this gate. So he walked over to the other two coffins and slowly lifted them.

As soon as the coffin lid was lifted a little bit, Luo Yuanhao felt that something was not right, as if there was suction under the coffin, and when the coffin lid was opened a little bit, it was covered by a huge suction force.

Open it again, then close it again. He couldn't take a look if he wanted to.

It's like it's windy and it's hard for people in the house to open it, or it's easy to open but it's hard to close. It's just that the pulling force here is greater, much greater than that!

Luo Yuanhao spat and took two deep breaths, he didn't believe that he couldn't even open a coffin board! He mustered all the strength of his body, and slowly moved the coffin board away.

He pushed forward and upward, and the lid of the coffin finally opened wider and wider.

However, none of the two people present noticed that the faint light edge of the headlamp had illuminated the inside of the coffin, and there was something lying inside!

As Luo Yuanhao lifted the coffin up to a foot high, the thing suddenly opened its eyes!

Inside the coffin, his eyes flashed with a fierce cold light!

"Oh, it's so heavy." Luo Yuanhao finally gave up again, his arms were really a little unable to hold up, how could the air pressure inside and outside this coffin be so different?

"What's so heavy, what's going on?" Zhang Wei asked while concentrating on prying the door.

"The air pressure gap between the inside and outside of this coffin is so big. I can't open it. ”

"Did you suck it like a sucker?" Zhang Wei stopped what he was doing, turned his head and asked.

Luo Yuanhao said: "If you can open it a little, you just can't lift it." ”

"Alas...... It's terrible to be uneducated. As long as it is turned on, the internal and external air pressure is equal. Understand? "Huh? Is that so? Luo Yuanhao scratched the back of his head.

"Of course." Zhang Wei always focused on prying the door, but the hissing sound of inhaling cold air kept coming, "It's me here, no matter how hard I try, I can't open it, and I don't know what's going on." ”

"Could it be that the small stone that was padded earlier was crushed by the slug when the door was closed, so that there was no gap inside, and it was particularly difficult to open?" Luo Yuanhao actually thought about this from the beginning, the stone door here was probably not originally designed for passage, so the thickness of the door is thinner than the door frame, it is trapped under the door frame, and there is no door handle, there is no place to exert strength.

Now the stone door has been padded into the crushed stone slag, and it is impossible to open it.

With a "bang", the dagger was pried off. Zhang Wei didn't answer, he had a depressed face, so he had to pick up the American military tomahawk and pry it with the sharp part of the back, but the door still didn't move. Soon the hope that it could be opened was dashed.

Luo Yuanhao also glanced at it a few times, Zhang Wei's method of prying the door was still very skillful and patient. If he changes his personality, I'm afraid that he will even break the axe in three or two strokes.

The reason why he asked Zhang Wei to try it and didn't help himself was because Zhang Wei was more careful than him and more suitable for this kind of work that required patience.

Pressing the coffin with one hand, I already remembered that there was a stone table in the passage outside the stone gate, and there seemed to be a stone bench.

But how can there be such seemingly meaningless arrangements outside the cemetery? Why did this door sink into the jamb?

There are not even doorknobs, apparently not for opening and closing doors, but for closing them!

By the way, close the door, just can't open it!

Could it be that those tables and stools outside may be someone living outside? Or rather, this door, which is only convenient to open from the outside, and extremely difficult to open from the inside, has never thought of opening from the inside!

As for the tables and stools outside, they could not have been used by craftsmen for rest. Probably the same setting as the prisoners, which is a point of supervision.

But when they came in, there was no exit from the supervision point, and even the way in was dug by tomb robbers......

When Luo Yuanhao thought of this, not only was he not greatly disappointed, but he almost jumped up on the spot, because he knew that there must be other ways out of this place, but they might not be able to find it!

Luo Yuanhao tried to clear his thoughts, if he could understand the purpose of this tomb being set up, then he might find a shortcut to open the door of the tomb!

However, Zhang Wei was concentrating on prying the door, and at the same time, he was popularizing the knowledge of science, which completely interrupted his current thoughts:

"The change in atmospheric pressure is related to altitude and weather. Atmospheric pressure is generated by gravity in the atmosphere, and the higher above the ground, the lower the atmospheric pressure is, but it is not necessarily uniform. ”

"Did you know that water vapor is less dense than air, so when there is more water vapor in the air, the air density becomes less and the atmospheric pressure decreases. Water vapor is what forms rainwater. So if you notice a sudden drop in atmospheric pressure, it's a sign that it's going to rain. It has been raining for several days and the atmospheric pressure has become stronger, so it is expected to clear soon. In addition, the change of atmospheric pressure is also related to the temperature, and the low temperature is the high atmospheric pressure. High temperature and low air pressure......"

"Since I've been exposed to Flying Zombies, the temperature of zombies has been about the same as frozen meat in the freezer. Why do you think the refrigerator needs to be opened when it is closed? It is because of the low temperature inside that the air pressure is very small. The atmospheric pressure of the outside world will firmly hold down the refrigerator, so it takes strength to open it! ”

"Refrigerator?" Luo Yuanhao was puzzled, didn't he graduate from elementary school? "Isn't that a magnetic door seal at work?"

"I'm like, if you can make the door as airtight as a suction cup, it doesn't have to use this material at all."

"Oh," Luo Yuanhao nodded. He always felt that what Zhang Wei said at the beginning seemed to be wrong, and he couldn't remember it.