Bi Fang adjusted his posture in the water, concentrated his strength on his upper body, and quickly punched, breaking through the sea water with the edge of his fist, and hit the dolphin hard on the forehead.
The skin of the dolphin is very smooth and very soft, and Bifang's punch was like a giant punch on the carbon fiber plastic plate padding the sea surface, quickly slicing open the head.
Although the damage was not serious, it still caused the dolphin to feel pain and turn over in the water.
It was stunned by this punch.
The bottlenose dolphin and its companion were stunned. They didn't understand what Bifang was doing. They swam beside Bifang and made a sharp cry in the water.
Huge ringing noise mixed with cries circulated in Bifang's brain, and he could feel the dolphin in front of him asking questions.
It was wondering about Bifang's behavior.
Unfortunately, the dolphin's question was not answered, but instead attracted more punches on the soles of the feet.
A few minutes later, the dolphin's tail fin slammed into Bifang's chest, and it flew away with its companions, never paying attention to the stranger it had "rescued."
The huge force slapped Bifang on the rock wall, breaking many sandstone gravels, but Bifang not only did not feel uncomfortable, but actually laughed.
But it hurts so much.
Bi Fang helplessly clutched his chest. His lungs were being compressed by the water pressure, and the dolphin's tail fin hit him like a battering ram, almost causing him to vomit blood.
At this time, Bifang felt short of breath in his chest, as if he had been holding his breath too much, was retching, and was somewhat out of breath.
Animals have always been bigger and stronger. The black bear Bi Fang hunted was only 300 kilograms, but the bottlenose dolphin just now was over 300 kilograms, which is 600 kilograms. It was a full pound heavier than the previous black bear.
Times!
It sounds incredible. The black bear, which looks so ferocious and huge, 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 a black bear looks bigger is entirely due to the visual effect caused by its fur and scattered limbs, which are far inferior in quality to an adult dolphin.
In the sea, Bi Fang not only has difficulty moving, but dolphins don't have the same obvious weaknesses as black bears. They are better at attacking and swimming. In a one-on-one match, he doesn't have much chance of winning, let alone two.
Bi Fang didn't dare to use too much force just now, for fear of really irritating the opponent and he might not be able to defeat the opponent...
Leaning against the rock wall, Bi Fang bit the breathing valve and kept exchanging airflow to soothe his swollen chest. The huge Cow Harbor Trevally was still stuck on the spear at this time, and its tail fin was floating up and down with the current.
Above the sea, several cruise ships with colorful lights are wandering in the distance. If you look closely, you can see the unique dolphin shape on the hull.
Dolphin Bay is a restricted area and rarely visited by people. Only nearby fishermen occasionally come back to patrol the area, 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, if someone passed by, they would quickly hide in the rocks and stare at them.
Looking at the calm sea, the two of them were filled with anxiety.
Bi Fang's strength is obvious to all, but it is underwater after all, and underwater has never been a specialty for humans.
Even monkeys are not good at water, let alone ordinary humans.
In addition, the opponent is the famous aquatic bison, which inevitably makes people worried.
Mandy and Keke are both great at diving. They are a national champion, a professional instructor, and they both know a lot about underwater creatures, but this does not mean that they can fight with those creatures.
If you want to go into the water to help Bifang, you can't do anything. Instead, it may happen that Mandy encounters the Niugang Trevally, and is knocked unconscious in one encounter, becoming a burden to the big fish.
"It's been ten minutes, will there be any accidents?"
"It's not like I didn't bring an oxygen bottle. Let's wait a little longer."
"Hey, here we come!" Mandy pointed to the sea and shouted suddenly.
The calm sea surface suddenly broke into a wave, and Bi Fang stood on the shallow talk, leaning his spear on his shoulder. A large fish almost as tall as a person hung on the tip of the spear, dripping with a mixture of blood and seawater.
Bi Fang took off his goggles, closed the oxygen valve, and breathed in the fresh air from the coast. The thick salty wind filled his lungs, feeling the long-lost comfort.
The tail fin of Niugang Trevally twitched subconsciously, and Bi Fang threw it to the ground and struck again.
Mandy and Keke hurriedly came out of the water and looked at the Niugang Trevally whose body was covered by the sea water with their eyes filled with wonder.
Mandy flailed her hands wildly and yelled: "wtf, I thought you were going to beat it away, but you actually killed it directly?"
Bi Fang waved his hand, found a few nodes on the Niugang Trevally, and pierced it with a spear.
"What are you doing? Isn't it dead?" Mandy was surprised, and now he was very excited.
It's one thing to see it on TV, but it's another thing to experience it in person, especially since I am a witness to the power of the Niugang Trevally.
Bi Fang thrust his spear down a few times, and the blood of the Niugang Trevally gurgled out from those holes.
“Very few people buy the cow trevally, not only because the meat quality is not good, but also because it contains a lot of toxins.”
"This guy mainly feeds on crustaceans, arthropods, fish and water birds. Some of the crabs, shrimps, snails and marine fish it likes to eat contain natural biotoxins, which will accumulate in the blood of the Niugang trevally, so it quickly catches it.
Only by bleeding and detoxifying can we prevent accidents after consumption.”
Only some veterans of sea fishing know such key points, while many novices don’t even know anything about it. Even amateurs like Keke don’t know that such a thing exists.
No wonder the last time I went fishing in the sea, I saw a man digging several holes into the Niugang trevally he caught. At that time, Keke thought he was exhausted and was taking advantage of it to vent his anger.
Bi Fang and Keke dragged the Niugang trevally weighing 70 kilograms to the shore.
"Eat, you want to eat it?"
Bi Fang nodded: "I want to have a taste."
Although it was not delicious, Bi Fang knew that. He had never tasted it himself, not to mention that he had caught it himself, so there was no need to throw it away in vain.
"How did you kill it?" Mandy and Keke were both curious.
Bi Fang shook his head again and told the two of them the scene just underwater.
Mandy's eyes lit up, obviously excited to meet someone of the same kind.
"I hope that last blow can break the dolphin's good impression of 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 becoming fond of humans, isn't this a tragedy?
"Okay, don't think too much." Bi Fang held the shoulders of the two of them and looked up at the moon in the sky. "It should be around twelve o'clock now. We don't have much time, so hurry up and work!"
"Let's finish all this as soon as possible and tell the public all the truth. This is the purpose of our coming here!"
The black bear hunting season started on July 12. On the first night, Bifang, Mandy, and Keke arranged some camera positions in the jungle together.
Today is the second day of the hunting season, which is the night of the 13th. We will try to arrange all the underwater cameras in one night.
There are many places on the mountain that are good angles for shooting, but I didn’t even have time to install them.
In order to bring this equipment, Richard and the others used a total of forty-three large boxes, which shows how arduous the task of Bifang and the others was.
This is not just about moving things out and arranging them, but rather placing them in appropriate places and at appropriate angles based on different design features and disguises.
According to the information Bi Xiang heard from local fishermen on the first night, the dolphin fishing season will begin on July 15th, which is the evening of the day after tomorrow.
A grand ceremony is held in the evening to announce the beginning of the annual dolphin fishing season, which lasts for most of the 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.
Go to Dolphin Bay, which is surrounded by mountains on three sides.
Carry out a collective trap and kill.
There is not much time left for them. Tonight, the night of the 14th, plus the night of the 15th, there are still three chances, and the massacre will begin.
Time waits for no one.
The three of them acted quickly. Mandy nervously put on a spare diving bottle and followed Bifang into the water.
Ten meters, twenty meters, thirty meters.
Bi Fang and Mandy quickly adapted to this process and dived deeper.
After more than thirty meters, a completely different feeling arises.
The whole body was different. The huge seawater pressure slowly changed the density of the two people's bodies, and when they reached a certain critical point.
Bi Fang felt his body sink. The buoyancy could no longer completely offset the gravity. Under the drag of gravity, the two of them slowly fell towards the depths.
This is a tactile sensation that a diving training device cannot bring at all, it is magical and wonderful.
They were slowly pushed to the depths of the ocean.
Any diver needs to keep in mind the three most important diving laws. They are:
Boyle's law.
Dalton's law.
Henry's Law.
Sounds familiar, right?
Yes, these are the three laws of gases.
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. In more other diving fields, such as technical diving at this time, Bifang and Mandy also
Trimix or pure oxygen may be encountered.
The first rule of scuba diving: never hold your breath!
Corresponding to Boyle's law: For an ideal gas, when the temperature remains constant, pressure and volume are inversely proportional.
Think of the lungs as a balloon. We can inhale to blow it up, or exhale to deflate the air inside it.
When we dive, the pressure rises. Every time we take a breath, the air inside the lungs is compressed, but the space in the lungs is filled again after inhaling.
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 require 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 it contains too many technical methods.
This is a way to balance the lungs and qi.
Coincidentally, Bi Fang is well versed in this.
These abyssal worlds seem to be completely separated from the rest of the earth. They have been waiting there quietly for millions of years until Bifang's flashlight cast the first ray of light there.
A pressure-resistant infrared detector was installed at a distance of forty meters.
This is military equipment and cannot be taken out of the country under normal circumstances. It was only approved after Bi Fang made an application. Through infrared rays, it can better detect the activities of dolphins.
Above thirty meters, the sun can barely shine. Below thirty meters, it will be completely dark even during the day. Therefore, further down, Bi Fang and others need to install not cameras but detection devices.
Most of these devices may be useless, but they must exist, just like there are a lot of discarded lenses in movie shooting. Not every device can capture just the right shot, but it must exist.
After loading, Bi Fang did not dive rashly, but took out his flashlight and gave Mandy a series of flash signals.
When Mandy finished answering, he also flashed the light, and Bifang answered.
After confirming that both of them were fine, Bi Fang adjusted the gas in the oxygen bottle and continued to dive.
People usually define diving within a depth of 40 meters as recreational diving.
Why choose the number 40 meters?
Two reasons.
First, 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, so under the partial pressure of oxygen of 1.4 bar, the toxicity of oxygen will become more and more serious. Oxygen poisoning may affect the diver's central nervous system and cause divers to have underwater nerve convulsions.
This directly affects the diver's ability to bite the regulator.
Similarly, when the partial pressure of nitrogen is around 30 meters and exceeds about 3 bar, some divers will feel anesthetized, and this feeling becomes worse 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, more and more nitrogen will accumulate in the human body.
This nitrogen can cause the human body to enter a state similar to drunkenness, commonly known as "nitrogen drunkenness".
At depths below 40 meters, the effect of nitrogen narcosis will be so strong that people lose their ability to judge and react, leading to safety accidents.
Many people don't even realize that they are nitrogen intoxicated. They feel very awake and even very high, but they can't even do the basic math problem that one plus one equals two correctly.
Just now, Bifang 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 beyond 40 meters enters the fields of technical diving and industrial diving.
Decompression sickness, nitrogen drunkenness and other troubles are all caused by nitrogen, but it can't be done without nitrogen because breathing pure oxygen directly is toxic.
Astronauts can breathe pure oxygen for several hours before a spacewalk and will not be affected by decompression sickness. However, 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 poisoning is conditional - when the partial pressure of inhaled oxygen exceeds 0.3 bar (30 kPa), oxygen will be toxic to cells.
Things that astronauts can do in space are not possible underwater. Inhaling pure oxygen in an underwater high-pressure environment can cause oxygen poisoning.
The human body is so fragile.
Even more accurately, at a depth of more than 55 meters, even breathing air will cause oxygen poisoning, let alone breathing pure oxygen.
At this time, the oxygen bottles behind Bifang and Mandy had three types of 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 give amateurs a headache.
Not only is diving down, but coming up is even more troublesome. You need to stay at different depths for enough time to gradually discharge excess nitrogen from the body.
The world record for technical diving was set by a man named Ahmed Gabr in 2014 - he dived to a depth of 332 meters.
It only took Gabr 14 minutes to dive to 332 meters, but it took 14 hours to surface.
Even though Bi Fang can now dive into an area of 70 meters with bare hands, this is based on the fact that he does not have to stay for a long time, and the changes in his body are not too drastic.
If he stays too long, he also needs to obey the laws of physics.
50 meters underwater.
Bi Fang's body entered the second stage, and the capillaries in his lungs began to become congested and hardened to protect his chest from water pressure.
The pressure is getting bigger and bigger. If ordinary people don't make any preparations and enter such a stressful environment in an instant, they will definitely die.
A long time passed until we were 80 meters underwater.
Eighty meters is a number that makes people feel suffocated, but the more they struggle, the more dangerous it becomes.
Here, you can only rely on spiritual and psychological strength to overcome it, tell yourself, follow nature, and only by completely relaxing can you turn harm into protection.
In the dark world, far away from light and humans, with only coldness and loneliness for company, Bi Fang seemed to have turned into a small drop of water, floating quietly in the ocean.
As the last piece of equipment was installed, Mandy and Bifang breathed a sigh of relief.
Plan completed!
－－－－－－Digression－－－－－
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