Section 344

"If we have a survival knife, it's not difficult to build a shelter, but without survival tools, we have to think more."

"We must try our best to find places that can provide us with convenience..."

Talking as we walked along.

On the beach, there are only coconut trees, reefs, and low bushes.

Not to mention caves, not even a rat hole can be seen.

After walking forward for a while, about four or five hundred meters away from the birth point, Lu Yu inadvertently found a very unique seaside rock.

The rock protrudes high from the shore.

The terrain is very high, and there are lush vegetation on it.

At first glance, it seems to be no different from ordinary reefs, but you can find it as long as you look closely.

Although the upper body of the rock is level with the coastline, there is a very large gap at the bottom...

Chapter 314 Heat Reflective Wall! Everything can be sunscreen? (, 4K

Chapter 314 Heat-reflective wall! Everything can be protected from the sun? (55, 4K 2-in-1, 49 less)

It’s not accurate to say it’s a gap.

But it’s not too far off.

However, it doesn’t look like a cave.

Rather, it looks like a change caused by seawater erosion and weathering.

Seeing this scene, Lu Yu’s eyes lit up, and he quickly turned the camera and pointed to the rock in the distance and said:

“Brothers, do you see the gap under that rock? Let’s go and take a look, maybe there will be unexpected discoveries.”

As he said, he took two steps at a time and walked over in a hurry.

Finally.

Came close.

The whole picture of the rock was in full view.

The huge narrow gap was at the bottom.

The space was very large.

The deepest point was probably 20 to 30 meters away from the coastline.

The inside of the gap was very smooth.

At first glance, you can tell that this is After years of seawater erosion, there are traces of this.

In addition, the white salt stains on the surface of the rock are also the best proof of this argument.

After watching outside for a while, Lu Yu walked straight into the gap, looked around for a long time, and finally came to the conclusion:

"This place is good. Although it is not a cave, it is enough to shelter from the wind and rain."

"You see, this is a typical phenomenon of seawater erosion. The ebb and flow of the tide day after day have made the waves carve out a large narrow space at the bottom of the rock... To be honest, this is definitely a very good natural camp. You don't need to do much. You just need to hide here and make a fire to gain a foothold first."

After that.

Lu Yu shifted his attention to the present again and carefully observed the gap.

Then, he bent down again and moved slowly. Moved to the deepest point and confirmed the tide line.

The most important point in building a shelter on the coast is to observe the tide line.

Whether it is a slope house or a natural shelter, you must always ensure that the resting place is located on the tide line.

Only in this way will the rising and falling waves not disturb you.

Thinking of this, Lu Yu slowly said to the camera:

"Friends, when building a shelter in such a place, you must pay attention to the tide line. Whether it is adapted to local conditions or done by yourself, as long as you live around the beach, you must pay attention to this."

"Because no one wants to be suddenly awakened by the waves when sleeping at night, so this is particularly important."

Facing the camera, Lu Yu gestured while speaking.

Tell the audience about the intertidal zone and how to judge Method.

All kinds of professional knowledge made everyone stunned.

Almost all of them were confused by Lu Yu.

But they still listened with great interest.

"The water level line when the seawater is high tide is the high tide line, and the water level line after the tide is low tide is called the low tide line, and the intertidal zone is the area between the high tide line and the low tide line."

"What we have to do is to always ensure that the shelter is located above the intertidal zone."

"The method of judging the intertidal zone is very simple and direct. You only need to observe the texture of the beach and stay away from the tide pool, that is, those small pools scattered above the low tide line, and you can get a rough range."

As he said, Lu Yu put it into practice.

According to this method, combined with the situation at the time, the tide line was planned, and his shelter was placed in a relatively safe range.

To be honest, this place is really good.

Although the space is large.

But it is very compact.

The rock above is completely a natural rain shelter, a perfect single-roofed slope house!

Secondly, the view is also very good.

With your back against the rock, you can see the general situation in all directions of the coast.

Of course, these are all secondary.

The most important thing is that there is a piece of rock that is neither too big nor too small standing right in front of the shelter.

"This rock can really be regarded as a stroke of genius, it is just right."

Looking at the rock, Lu Yu murmured and sighed.

However, the audience did not seem to understand this just right!

One by one, they all asked in the barrage:

"Isn't it just a broken stone?"

"Yes, Master Yu, what's so special about it?"

"It can't be a valuable gem, right?"

"Upstairs, you have a really big imagination. This kind of stone is everywhere in our house. If it is a gem, wouldn't I be rich?"

...

In the barrage, everyone held their own opinions and said all kinds of things.

Here, Lu Yu did not continue to keep the secret and gave the answer directly:

"Brothers, this stone, although it is an ordinary stone, is a treasure to me."

"The location of the rock is just in front of my shelter, the distance is just right, one more point is far, one less point is close, if you light a bonfire under this rock, it will immediately become a qualified heat-reflecting wall!"

Heat-reflecting wall?

The audience was a little confused when they heard it, and the screen was full of question marks.

Seeing this, Lu Yu continued to explain:

"It's actually very easy to understand. We all know that heat is actually a wave, which can be reflected."

"Yes, it's that simple."

"If there is no rock, most of the heat emitted by the bonfire will be wasted. But with it, it's different. At that time, the heat emitted will be fed back to my location through the rock, and the heat will be continuously fed back to the location where I am, avoiding the loss of heat to the greatest extent."

"In this way, at night, as long as the bonfire is not extinguished, I will spend the whole night in a more comfortable temperature."

Wow!

Hearing Lu Yu say this, the audience suddenly became enlightened!

"666!"

"Great, bringing a physicist?"

"It seems that you really can't get by without education these days!"

"Don't try to reason with me, I just want to watch the uncensored live broadcast!"

"233333333"

...

Soon, after choosing a shelter, Lu Yu was busy all the time.

He searched along the bushes along the coast for a long time and got a lot of palm leaves.

"Although there is a heat-reflecting wall, moisture-proofing cannot be ignored. I once said in a live broadcast that moisture-proofing is the most important part of the shelter layout process."

"Even if you don't have time to build a shelter, you must never give up this link, because moisture-proofing is really too important."

"Especially here, sleeping on the beach is almost equivalent to seeking death."

"The specific heat of sand and stone is smaller than that of air. During the day, when absorbing the sun's radiant heat, the temperature of sand and stone of the same mass is higher than that of the air near the ground. Heat transfer is transferred from sand and stone to air. At the same time, because the specific heat of sand and stone is small, sand and stone absorb heat and heat up quickly, so that the air near the ground also heats up quickly."

As he spoke, Lu Yu placed a large handful of palm leaves next to the beach of the rock shelter.

While making the bed for himself, he explained to the audience the importance of moisture-proofing:

"But once it's night, the situation will change. The ground radiates heat to the air, the air convects, the sand and the cold air near the ground exchange heat, and the sand and the air cool down... So at night, the temperature on the coast will drop sharply."

"At this time, if you are unprepared and just sleep on the ground, the heat in your body will definitely be lost at an unimaginable speed. If you are lucky, you may be able to see the sun the next day, but if you are unlucky, you will really fall asleep..."

This is not groundless.

The audience also knows the principle that sand has less heat.

So when they heard it, everyone realized the seriousness of the problem.