Live Wilderness Adventure

Chapter 547 Technical Diving

Dark underwater world.

Bi Fang adjusted his posture in the water, concentrated his strength on his upper body, and quickly swung his fist. The edge of the fist broke through the sea water and hit the dolphin hard on the forehead.

The dolphin's skin is very smooth and very soft. Bi Fang's punch, like a huge carbon fiber plastic plate cushioned on the sea surface, quickly sliced ​​open from the head.

Although the damage was not large, it still caused the dolphin to feel pain and turned over in the water.

It was blinded by this punch.

The bottlenose dolphin and its companions were stunned, not understanding what Bi Fang was doing, and they swam beside Bi Fang, making sharp calls in the water.

The huge circular noise in the ear mixed with the cry circulated in Bi Fang's brain, and he could feel the dolphin in front of him asking questions.

It is doubting Bi Fang's behavior.

It's a pity that the dolphin's question was not answered, but it attracted more punches and kicks.

A few minutes later, the dolphin's tail fin slammed into Bi Fang's chest, and it drove away together with its companion, never paying attention to the stranger he "saved".

The huge force slapped Bi Fang on the rock wall, breaking many sandstone gravels, but Bi Fang not only didn't feel uncomfortable, but laughed instead.

However, it hurts.

Bi Fang clutched his chest helplessly, his lungs were already compressed under the water pressure, and the dolphin's tail fin hit him like a battering ram, almost slapping him to vomit blood.

At this time, Bi Fang felt short of breath in his chest, as if he was holding his breath too much, retching, and a little out of breath.

The bigger the animal, the stronger the strength. The black bear that Bi Fang hunted was only 300 catties, but the bottlenose dolphin just now exceeded 300 catties, which is 600 catties, which is a full heavier than the previous black bear. times!

It sounds incredible, it looks so fierce, the huge black bear is only half the weight of the dolphins in the aquarium?

In fact, this is true. Male black bears usually weigh between 60 and 200 kilograms, but male bottlenose dolphins can weigh between 300 and 650 kilograms.

The reason why the black bear looks bigger is entirely the visual effect caused by the fur and scattered limbs, which are far inferior to an adult dolphin in quality.

In the sea, Bi Fang is not only inconvenient to move, the dolphins do not have the obvious weakness of the black bear, they are better at attacking and swimming, and he has no great chance of winning in a one-on-one match, let alone two.

Bi Fang didn't dare to use too much force just now, for fear that if he really set the opponent on fire, he might not be able to beat the opponent.

Leaning against the rock wall, Bi Fang bit the breathing valve to exchange airflow constantly, soothing the stagnant chest cavity. The huge bull trevally was still inserted on the spear at this time, and its tail fin was fluttering up and down with the current.

On the surface of the sea, several cruise ships with colorful lights are wandering in the distance. If you look carefully, you can see the unique dolphin shape on the ship.

As a restricted area, Dolphin Bay is rarely visited. Only nearby fishermen occasionally come back to patrol here, and even cruise ships will not approach it easily.

Keke and Mandy stood in the shadow of the shore, not daring to show their heads at all. Occasionally, when someone passed by, they quickly hid in the rocky reef, staring wide-eyed.

Looking at the calm sea, the two were burning with anxiety.

Bi Fang's strength is obvious to all, but it is underwater after all, and underwater has never been a special event for humans.

Sun monkeys are not good at water, let alone ordinary humans.

In addition, the opponent is the famous water bison, which inevitably makes people worry.

Mandy and Keke are both good at diving. A national champion, a professional coach, and a lot of knowledge about underwater creatures, but this does not mean that they can fight with those creatures.

There is nothing he can do if he wants to go into the water to help Bi Fang. Instead, there may be a situation where Mandy meets Niugang Squid, and he is knocked unconscious after a face-to-face encounter, becoming a big burden.

"Ten minutes, will there be any accidents?"

"It's not that I didn't bring an oxygen cylinder, so wait a little longer."

"Hey, here we come!" Mandy pointed to the sea and shouted suddenly.

A wave broke suddenly on the calm sea surface, Bi Fang stood on the shallow table, with a spear resting on his shoulder, a large fish almost one person tall was hanging on the spear tip, dripping a mixture of blood and sea water.

Bi Fang took off the goggles, closed the oxygen valve, and took a deep breath of fresh air from the coast. The thick salty wind poured into his lungs, feeling the long-lost comfort.

The tail fin of Niugang trevally twitched subconsciously, and Bi Fang threw it to the ground and made another cut.

Mandy and Keke rushed to the water, looking in amazement at the Niugang trevally covered by the sea water.

Mandy waved her hands and yelled, "WTF, I thought you were going to knock it away, but you just killed it?"

Bi Fang waved his hand, found a few nodes on Niugang trevally, and stabbed it with a spear.

"What are you doing? Isn't it dead?" Mandy was surprised, now he was excited.

It is one thing to see it on TV, but another thing to experience it in person, especially since I am a powerful witness of Niu Hong Kong Squid.

Bi Fang went down with a few spears, and the blood of Niugang trevally flowed out from those holes.

"Niugang trevally is rarely bought by people. Apart from the poor quality of the meat, it is because there are a lot of toxins in its body."

"This guy mainly feeds on crustaceans, arthropods, fish and water birds. Some crabs, shrimps, snails and sea fish it likes to eat contain natural biotoxins, which will accumulate in the blood of the cattle port trevally, so after catching them, they quickly Bloodletting and detoxification can prevent accidents after eating."

Only some sea fishing veterans know this kind of point, and many novices don't even know it at all. Even amateurs like Keke don't know that there is such a thing.

No wonder the last time I went fishing in the sea, I saw someone sticking a few holes in the Niugang trevally that I caught. At that time, Keke thought he was exhausted and was venting his anger on it.

Bi Fang and Keke dragged the 70-kilogram Niugang trevally to the shore.

"Eat, do you want to eat it?"

Bi Fang nodded: "I want to try it."

Although it is not tasty, Bi Fang knows that, he has never tasted it himself, let alone fished it himself, so there is no need to throw it away for nothing.

"How did you kill it?" Mandy and Keke were curious.

Bi Fang shook his head again, and told the two of them the underwater scene just now.

Mandy's eyes lit up, obviously the excitement of meeting the same kind.

"I hope that last blow can break the dolphin's goodwill toward people. It's best to run far away, leave as soon as you see the fishing boat, and never come back here again." Bi Fang sighed.

The atmosphere suddenly fell silent.

Keke nodded silently, in order to prevent dolphins from having a good impression of humans, isn't this a kind of sadness?

"Okay, don't think too much." Bi Fang pressed the shoulders of the two of them, looked up at the moon in the sky, "It should be around twelve o'clock now, we don't have much time, hurry up and work!"

"We did it all early and told the whole truth to the public, that's what we're here for!"

The black bear hunting season started on July 12th. On the first night, Bi Fang, Mandy and Keke set up a part of the camera positions in the jungle.

Today is the second day of the hunting season, that is, the night of the 13th, and we strive to arrange all the underwater cameras in one night.

There are still many places on the mountain that are good angles for shooting, but I didn't have time to install them.

In order to carry these equipments, Richard and the others used a total of forty-three large boxes, which shows how heavy the task of the three of Bi Fang is.

This is not just about moving things out and arranging them, but placing them in a suitable place and at a suitable angle according to different design features and camouflage.

According to the news that Bi Xiang heard from the local fishermen on the first night, the dolphin fishing season will start on July 15th, which is the evening of the day after tomorrow.

A grand sacrifice is held in the evening, announcing the beginning of the annual dolphin fishing season that lasts for more than half a year. On the morning of July 16, many fishing boats will leave the harbor and use sonar devices to drive away all the dolphins in the nearby waters. To this piece of Dolphin Bay surrounded by mountains on three sides.

Carry out collective killing.

There is not much time left for them. Tonight, the night of the 14th, plus the night of the 15th, there are three more chances, and the massacre will begin.

Time is ticking.

The three moved quickly, and Mandy nervously replaced the spare diving bottle, followed Bi Fang into the water.

Ten meters, twenty meters, thirty meters.

Bi Fang and Mandy quickly adapted to this process and dived deeper.

After more than 30 meters, a completely different feeling arises spontaneously.

The whole body is different, and the huge seawater pressure will slowly change the density of the two people's bodies, when they reach a certain critical point.

Bi Fang felt his body sank, and the buoyancy could no longer completely counteract the gravity. Under the drag of gravity, the two of them fell slowly towards the depths.

This is a touch that diving trainers can't bring at all, magical and wonderful.

They were slowly pushed to the depths of the ocean.

There are three most important laws of diving that any diver needs to keep in mind, they are:

Boyle's law.

Dalton's law.

Henry's Law.

Does it sound familiar?

Yes, this is the three laws of gas.

The vast majority of recreational divers use air or enriched air as their primary breathing gas. These scuba diving gas laws apply to all breathing gases. Trimix or pure oxygen may be encountered.

First rule of scuba diving: Never hold your breath!

Corresponding to Boyle's Law: For an ideal gas, when the temperature remains constant, the pressure and volume are inversely proportional.

Think of the lungs as a balloon. We can inhale to inflate it, or exhale to empty it of the air inside and shrink it.

As we descend, the pressure rises, and with each breath, the air inside the lungs is compressed, but the space in the lungs fills up again after a full breath.

The deeper you dive, the higher the pressure, and more air is needed to fill it, so air consumption increases.

The pressure on a diver's lungs at depth causes them to need more energy to expand their lungs.

When breathing regularly, the "balloon" never inflates too much.

The same is true for the next two laws.

The reason why deep diving is called technical diving is because there are too many technical means contained in it.

This is a way to balance the lungs and qi.

Coincidentally, Bi Fang is well versed in this.

These abyss worlds seem to be completely cut off from the rest of the earth. They have been waiting there for millions of years, until Bi Fang's flashlight cast the first ray of light there.

A pressure-resistant infrared detector was installed at forty meters.

This is military equipment, and it cannot be taken out of the country under normal circumstances. It was approved after Bi Fang made an application. Through infrared rays, it can better detect the activities of dolphins.

Above 30 meters, the sun can still barely shine, and below 30 meters, it will be pitch black even in daytime. Therefore, what Bi Fang and others need to install is no longer a camera, but a detection device.

Most of these devices may be useless, but they must exist, just like there are a large number of discarded shots in film shooting. Not every device can capture just the right shots, but it must exist.

After reloading, Bi Fang did not dive in rashly, but turned on the flashlight and made a series of flashing signals at Mandy.

After Mandy finished answering, he also flashed, and Bi Fang answered.

After confirming that both of them were fine, Bi Fang adjusted the gas in the oxygen cylinder and continued to dive.

People usually define diving within a depth of 40 meters as recreational diving.

Why did you choose the number 40 meters?

Two reasons.

One, when diving at this depth, you can rise directly to the surface in an emergency without worrying about serious safety issues.

Second, the partial pressure of air at sea level is one bar, and at an oxygen partial pressure of 1.4 bar, the toxicity of oxygen will become greater and greater. Oxygen poisoning may affect the diver's central nervous system, causing divers to convulse underwater.

This directly affects the diver's ability to bite the regulator.

Similarly, when the partial pressure of nitrogen is about 30 meters and exceeds about 3 bars, some divers will have a feeling of anesthesia, and this feeling will aggravate as the partial pressure increases.

This is Henry's Law, which relates the solubility of a gas in a liquid to the surrounding pressure.

As the diving depth increases, the nitrogen in the human body will accumulate more and more.

These nitrogen will make the human body enter a state similar to drunkenness, commonly known as "nitrogen drunk".

At a depth below 40 meters, the effect of nitrogen narcosis will be so strong that people will lose their ability to judge and respond, leading to safety accidents.

Many people don't even realize that they are nitrogen drunk. They feel very clear about themselves and even feel high, but they can't even do the basic math problem that one plus one equals two.

Just now, Bi Fang and Mandy were confirming each other's sobriety, and asked each other a two-digit addition and subtraction math problem.

Because of this, people set the depth limit of recreational diving at 40 meters, and diving over 40 meters has entered the field of technical diving and industrial diving.

Decompression sickness, nitrogen narcosis and other troubles are all caused by nitrogen, but it is impossible without nitrogen, because direct inhalation of pure oxygen is poisonous.

Astronauts can breathe pure oxygen for several hours before a space walk, and they will not be affected by decompression sickness, but this is because the air pressure inside the spacesuit is lower than that inside the space station, which is equivalent to a decompression environment.

Pure oxygen toxicity is conditional – oxygen becomes toxic to cells when the partial pressure of inhaled oxygen exceeds 0.3 bar (30 kPa).

Astronauts in space can do things that cannot be done underwater. People inhaling pure oxygen in an underwater high-pressure environment will cause oxygen poisoning.

The human body is so fragile.

Even more accurately, at depths greater than 55 meters, even breathing air can cause oxygen poisoning, let alone breathing pure oxygen.

At this time, the oxygen cylinders behind Bi Fang and Mandy contained three gases, helium, oxygen, and nitrogen.

This is the so-called three-phase gas. The addition of helium reduces the content of oxygen and nitrogen. Just how to mix the content is enough to cause headaches for amateurs.

Not only diving is like this, but going up is more troublesome. It is necessary to stay at different depths for a sufficient time to gradually discharge excess nitrogen in the body.

The world record for technical diving was once set by a man named Ahmed Gabr in 2014 - he dived to a depth of 332 meters.

It took Gabr 14 minutes to descend to 332 meters but 14 hours to surface.

Even if Bi Fang can enter the 70-meter field at one time by diving with bare hands, it is based on the fact that he does not need to stay for a long time, and the changes in his body are not too drastic.

Stay too long and he needs to obey the laws of physics too.

50 meters underwater.

Bi Fang's body entered the second stage, and the capillaries in the lungs began to congest and harden to protect the chest cavity from the water pressure.

The pressure is increasing. Ordinary people will die if they enter such a stressful environment in an instant without making any preparations.

Time passed for a long time, until it was 80 meters underwater.

Eighty meters, a figure that makes people feel suffocated, but the more they struggle, the more dangerous it is.

Here, you can only rely on spiritual and psychological strength to overcome, tell yourself, follow nature, and only by completely relaxing can you turn injury into protection.

In the dark world, far away from light and human beings, accompanied only by coldness and loneliness, Bi Fang seems to be a small drop of water, floating quietly in the ocean.

With the installation of the last piece of equipment completed, both Mandy and Bi Fang breathed a sigh of relief.

The plan is complete!

Ask for a monthly pass, is it possible for two thousand. . .