The old field leader led Liu Li and the others away, Yang Zijiang and Fang Bojing glanced at each other, they didn't say anything, but in fact, they both understood in their hearts. Because they have all been in the desert and know the properties of quicksand.

As soon as the wind comes, the sand can bury everything in an instant, and the original form will completely cease to exist. There are still all kinds of sand dunes in my eyes, some of which are still very familiar, but in fact, they are no longer the original sand dunes.

According to the characteristics of sand dunes and their degree of stability, they can be divided into three types: mobile dunes, semi-fixed dunes, and fixed dunes on days when there is no strong wind.

When the wind is light, fixed and semi-fixed sand dunes can basically move no or less, but as the wind continues to increase, especially when the wind speed is more than 30 meters per second, a sandstorm is formed. The mobile terminal one-second memory provides you with wonderful \ novel reading.

The coarse sand will fly dozens of centimeters above the ground, the fine sand can fly up to 2 meters high, and the ubiquitous silty sand can fly to an altitude of 1,500 meters.

Among them, the semi-fixed and fixed sand dunes, although they still have a little left, have completely changed their form, while the mobile sand dunes are almost gone, all gone.

If you look for them based on the original impression alone, how can you find them? Not to mention at night, even if you look for it during the day, you will get lost. This is the reason why the old field manager did not agree to go out in the middle of the night.

This is also the reason why Yang Zijiang and the old field manager want to survey the drawing, because on the drawing, after all, there are construction coordinate points, no matter what shape the sand dunes become, the location can never be changed.

Therefore, when Fang Bojing saw that Yang Zijiang and the old field manager wanted to measure the map, he immediately understood Yang Zijiang's intentions. Of course, he also knew the consequences of the sand dune movement, which was naturally the reason why he was most afraid, so Fang Bojing's heart immediately pinched.

Think about it, if once the ancient tomb is buried by the moving sand dunes, it is equivalent to cutting off Zeng Fan's way of life, although the water and dry food can withstand it for a while, but what about the air? Once the air is cut off, won't this original ancient tomb become a living coffin?

When they think of this, can they not worry about it? Can you not be afraid? But these thoughts can only be held in my heart, how dare I communicate with Han Mei and them? If once you say it, don't talk about them, it's the old field manager and the correspondent, don't think about sleeping anymore.

But they've been tired for a day and two nights, and if they stay up like this, don't talk about them, even the iron man can't stand it? Therefore, although both of them thought of the worst outcome, no one dared to say it.

This is their weakness, and it is also the reason why the two of them have stopped wanting again, they have lived in the desert, especially Fang Bojing, who has been a little longer and has experienced several sandstorms. So, they all know how sandstorms are formed, and naturally they know how destructive they are.

Dust storms are generally caused by three conditions: strong winds, sand dunes and unstable air. Strong enough and sustained high winds are the main conditions for the formation of dust storms.

In addition to the above reasons, the damage to the surface formed by ground construction should not be underestimated. The construction team of the old field chief is carrying out highway construction work near the ancient tomb. Bulldozers and excavators will cause the surface to loosen, and it is inevitable that the vegetation will be destroyed! This is equivalent to artificially supplying fine sand and dust to sandstorms.

Think about it, now that the wind is so strong, what tomorrow will be like, who knows.

"I know what you're thinking, it's useless to think about it, no matter what the situation, don't we all have to face it? If you come, you will be safe, so let's rest quickly! Of course, Fang Bojing knew what Yang Zijiang was thinking, so he could only order him in an unquestionable tone, "The purpose of our coming here is to save people, is it okay not to rest?" Go to bed right away! ”

"Yes," Yang Zijiang replied briskly, he knew Director Fang's intentions, and naturally understood this truth, so he could only deal with it calmly, and there was no other way. However, seeing the director's hard work, he still persuaded, "You talk about me more than me, you can work harder than me, and rest quickly, right?" ”

"Okay, you go to sleep quickly, I'll talk to the old field chief a few more words, and I'll sleep!"

Yang Zijiang was forced to lie on the bed, but he tossed and turned, where did he sleep? He pondered over and over again, where was the tomb? What form does it take? How many earthly portions are there? Is it semi-underground? Or is it completely underground?

"Alas, desert, what have you become?" With this kind of doubt and uneasiness, it was not until dawn that he slowly felt a little sleepy.

In a daze, Yang Zijiang seemed to see Zeng Fan, they were buried in the ancient tomb, looking disgraced, but he couldn't find the entrance to the tomb. He shouted as hard as he could, but they couldn't hear him.

He woke up suddenly, and when he heard the wind roaring outside, he had no intention of stopping, and he couldn't sleep anymore, so he had to go to Fang Bojing.

"Director, I don't think this wind is small at all? When are we going to go? ”

"There is a forecast that it can stop in the afternoon, let's go in the afternoon!"

"No, what if the wind doesn't stop in the afternoon?" Yang Zijiang was very worried, "Don't forget, in the past, the sandstorms were the most powerful in the afternoon, if the wind continues to rage like this, we will not be able to get out at all, Zeng Fan and they have insisted on a day and a night yesterday, if they can't go again this afternoon, it will be all over,"

"So what do you say? The wind still has no intention of stopping! ”

"Although the wind is still not light, do you notice, this dust seems to be smaller than yesterday!"

"Really?"

"yes, I just went out and found this strange. I think it's a period of air instability, so we'd better find the right opportunity to get out,"

"What do you mean by unstable air?"

"I'm talking about low air temperatures, but if the air temperature in the lower layers is too high, it will be unstable and easy to move upwards." Yang Zijiang explained, "Now is the time when the temperature is low, although the wind is still very strong, but the sand and dust are relatively small, which is why I recommend leaving immediately." ”

"Okay? Looks like you've studied sandstorms thoroughly? Then I ask you, why didn't you go last night? Isn't that cooler? ”

"Although the temperature is low, the vision is not good at night, and everyone is too tired, which will backfire!"

"Well, yes, better than me,"

"I don't dare to take this seriously, but consider that sandstorms are generally stronger in the afternoon and evening, which is the most unstable time of the day. Moreover, if you can't go out in the afternoon, it's night again, I'm afraid that Zeng Fan and they won't be able to hold out for so long! ”

Yang Zijiang's concerns are really not superfluous, Zeng Fan and them are struggling under the tomb at this moment for their own survival......

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