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The carbon dioxide accumulation area did not rise, and Fang Hong moved forward all the way.

The entire hollow valley is devoid of vegetation, while above, there are lush trees.

The giant leaves on both sides did not spare an inch of space, and the top of the valley was also closed, in other words, even if you flew under the clouds, you would not be able to detect this place.

In fact, the valley did not settle too quickly all the way, but slowly declined, Fang Hong walked out a few hundred meters, and the entire drop dropped a little.

"It doesn't look like a valley at all, it's like a road dug by hand, of course, just like it, and I don't see any traces of it. ”

Fang Hong came here to look for artificial traces.

But don't forget how this island came about, it was recorded in the treasure map of Captain Kidd, and there are a number of treasures in this place!

At the corner of the valley, there was still a long way to go, but Fang Hong saw a lake at a glance, a lake with pale blue water.

"Is this a river?"

"I guess so, there will be water when the rainy season comes. ”

"What is the rainy season, three hundred and sixty-five days and three hundred days covered by clouds, and there are still rainy seasons and dry seasons?"

Not far ahead, there was a lake, Fang Hong climbed up the cliff slope next to him, sat on the top of the cliff more than two meters high, and looked at the lake.

Chaotian turned around left and right, not knowing what Fang Hong was doing in this place.

"It was so cosy and beautiful. ”

Just when Fang Hong relaxed, Chaotian used his claws to exert force, scratching Fang Hong's shoulder, and he didn't know if the skin was broken, and Chaotian also screamed loudly.

It was on Fang Hong's shoulder, and the ears were ringing, which was so cool and transparent that it was almost deafening Fang Hong.

"What, what. ”

Under the gaze of all the sailors, the crystal blue surface of the lake in the heart of the distant island rippled.

Fang Hong obviously felt a tremor: "Earthquake? animals are keen, when the earthquake comes, they sense it in advance." ”

"The tremor was very small, about three levels. ”

It was only shaking for more than ten seconds, and Fang Hong was not too excited, however, above, on the opposite side of the lake, along a ring of the lake, countless birds suddenly flew in the woods.

The sky around this oval-shaped lake is dominated by flying birds.

The birds did not hesitate and flew out.

"What the hell, a hundred birds and a phoenix?"

"Is this a pilgrimage?

Sailors told the truth.

In front of Fang Hong's eyes, the crystal blue heart lake of the far island suddenly turned blood-red, and the entire lake water seemed to be boiling, churning.

"The water is boiling?"

That can't be, unless it's an atomic bomb, nothing can make such a large piece of water boil all of a sudden.

If it wasn't a nuclear explosion, there was only one possibility, and the gas escaped, creating a scene similar to water rolling and churning.

What kind of gas is the gas escaping?

Under Fang Hong's gaze, the oval-shaped lake suddenly turned red, and the boiling water instantly turned red, spreading all over the lake at a speed visible to the naked eye, and the entire lake was like a red, fierce beast's pupil.

In the panoramic shooting, Fang Hong saw another scene.

Under this lake, there are many huge oval-shaped bubbles, which are like the legendary water shelter, covering the entire bottom of the lake.

Fang Hong always felt that this scene was very familiar, but he didn't know what the situation was, and he couldn't remember where he had seen this kind of scene.

With the shaking of the earthquake, these bubbles quickly swelled up, from being pressed on the bottom of the lake by pressure, to escaping upwards, some large bubbles began to split into small bubbles, some large bubbles rushed out of the lake, the process of small bubbles bursting, the lake began to turn red, and the large bubbles small bubbles gushed out of the lake, directly bursting the lake water, flying, as if the water was boiling.

Fang Hong sat up directly, he remembered where he had seen this kind of scene: "Dry, volcanic gas escapes!"

I saw it in Antarctica, where bubbles in a magma lake swelled up and then exploded.

It's just that water can't compare to the viscosity of magma, so many bubbles are scattered into small bubbles.

"I finally know where all this carbon dioxide comes from!"

Fang Hong turned around and ran, without saying a word, what else was it like.

And the torch in his hand was thrown into the carbon dioxide of the valley.

This particular volcanic gas must have hydrogen sulfide gas, and running with a torch is like running with a burning gas canister, and it will collapse into the sky in a moment.

"This island is supposed to be a volcanic island, although there is no trace of volcanic activity, and there has been no volcanic eruption for many years, but the magma is still active, carbon dioxide enters the lake through the earth's crust, and under the pressure of the lake water, it collects at the bottom of the lake, and becomes a large bubble attached to the bottom of the lake. ”

"Brother Gun, the gas is so light, shouldn't it float in the water?"

"Haven't you ever drunk carbonated drinks, carbon dioxide can be under the bottle for a lifetime without external force. ”

The solution is to gently beat around the body of the bottle, and the bubbles will float up to the air on the upper part of the bottle before opening the cap, although the air pressure becomes high, but it will not be sprayed out with Coke.

The same principle is that just after an earthquake, a large amount of carbon dioxide escaped.

This phenomenon is scientifically known as the 'lake tumbling theory'.

Judging from the behavior of these birds, it seems that they have known that this lake is a bird-killing lake for generations, so they have integrated their genes to flee as soon as they encounter an earthquake.

In fact, carbon dioxide is a toxic gas, although the air contains a large amount, we are not poisoned, because the oxygen content is higher, once a large amount of exposure to carbon dioxide, it is called a real colorless and odorless poison, you will definitely die, and you are still a whole corpse, you can only check out suffocation and death, and it will not be too painful before death, because you have fallen into hallucinations or even fall asleep.

Fang Hong ran wildly and smelled the smell of rotten eggs, that is, hydrogen sulfide, fortunately the torch was thrown quickly.

"The main body of these gases is carbon dioxide, and there are also sulfide gases, which escape faster than carbon dioxide, and it is estimated that in a short period of time, this area is seriously insufficient in oxygen, and it is a forbidden area for life. ”

Of course, for a short period of time, the plant is completely unaffected, because once there is no oxygen absorption, the plant is considered to be in the daytime, photosynthesizing, and at night, the plant needs to breathe oxygen.

I guess these gases don't accumulate that long.

"Brother Gun, do you need to run so fast, you can't die. ”

"On August 21, 1986, a large amount of carbon dioxide leaked from the Nyos volcanic lake, and the lake water released a small amount of sulfur gas and a large amount of carbon dioxide in a short time, according to incomplete statistics, at least 1,740 people were killed by poison gas, and a large number of livestock were killed. The village of Gamño, the nearest to the volcano, was the hardest hit, with only six of the village's 650 residents surviving. ”

In other words, of course you won't die if you stay here now, and after ten minutes, you won't have any oxygen to run for your life.

"What the hell, so many people were killed by carbon dioxide?"

"Do you know why our ancestors clinged to the land of China and didn't want to interact with the outside world, although the land of our country is not the most fertile, it is the safest. ”

At the very least, there are no such lakes in the country that can escape volcanic gases.

In fact, this kind of lake is also rare, after all, the Antarctic volcano is so big, when Fang Hong went to investigate, he rarely saw volcanic gas, and the machine rarely detected it, and the volcano in Kenya National Park emitted water vapor instead of carbon dioxide.

This one lake is rare, and there are only three volcanic lakes on earth that have a record of killing people.