Chapter 540 GT!!!
Dolphin Bay is surrounded by mountains on three sides and faces the sea on one side. It is shallow but gradually deepens. Before leaving the mountains on both sides, it looks like a small lake.
Once you leave the bay, the depth of Dolphin Bay will suddenly increase to hundreds of meters.
Although dolphins are good at diving and can dive hundreds of meters, their activity range is mainly concentrated in shallow waters between thirty and fifty meters.
Therefore, the mission range of Bifang and Mandy is between ten meters and eighty meters. If they expand the range, they can basically capture all the behavior and activities of dolphins.
For this purpose, more than twenty cameras need to be installed, which may not sound like a lot, but it is not an easy job.
Radio is extremely lossy in the medium, so the signal degrades very quickly.
The dielectric loss in water is 7500dB/km above 30KHz, and can be attenuated by 150dB at 20 meters. Even if there is a base station on the water surface, there will be no signal below 20 meters.
The cameras used by Bifang and others this time are all automatic. They will be recovered and the recorded content will be taken out after everything is finished.
Therefore, underwater installation is completely different from the previous mountain video recording. It is impossible to observe in time whether the position is correct or not. The previous installation position could be continuously adjusted through remote command, but there is no such opportunity now.
Given that the dolphin hunting season is about to begin, the difficulty of underwater installation will increase exponentially. It is impossible to install and debug repeatedly, and we can only strive for success once.
The degree of this must be determined by Bifang and Mandy themselves.
Fortunately, before this, both of them had done a lot of shooting training with the help of photography assistant Mond, and could barely be considered semi-professional photographers.
After installing three cameras at a depth of ten meters in the shallow sea, Bifang Bifang and Mandy continued to move closer to the depths.
At twenty meters, thirty meters, it had reached the limit of active sinking. The world was dark and silent. Bifang could hear the beating of his own heart very clearly.
Running to the animal sounds that automatically appear in your mind may be the only signal that you can feel that you are still alive.
Bifang counted his own heartbeats silently. When he just became like water, his heart rate was still 60-70 beats per minute, but now it has dropped to 30-40 beats per minute, more than half.
This special breathing method can fill Bifang's lungs with ten liters of air, bringing tremendous upward force, allowing him to float in the water without doing anything, reducing the amount of muscle exercise required to resist gravity.
The deeper they went, the more the water pressure squeezed their lungs. At this time, Bifang and Mandy were floating in the water relying on the air in their lungs.
At the same time, the diving reflex causes the peripheral blood vessels to constrict, and blood will leave the limbs and flow to the most important organs: the lungs, heart and brain.
And because blood rushes to the brain, bringing a huge amount of oxygen, the diver's brain will be extremely clear at this time unless nitrogen intoxication occurs.
The more awake I am, the more I feel like I have come to another world.
Silence and darkness.
Some say that we know less about the ocean than we do about the moon.
This is not an exaggeration, because even in 1977, when astronauts had already been sent to the moon, it was naive to believe that there were no active life forms in the ocean abyss below 6,000 meters.
There was indescribable pressure from all directions, and every breath I took through the breathing valve that expanded my chest was like doing an oversized push-up.
It was as if he was being firmly grasped and squeezed by a giant.
The first wave of equipment brought down has been installed. Bifang and Mandy are about seven or eight meters away. They press the flashlight switch and it flashes a few times. After confirming that everything is completed, they prepare to surface and get the camera first.
Mandy nodded, moved her flippers, took a deep breath, and was about to float up when suddenly, a bright light flashed in front of her.
It was Bifang who was pressing the flashlight, and it was extremely rapid.
Emergency signal!
Mandy's mind was empty. Due to his strict training, he had almost no hesitation and twisted the direction based on his body instinctively. However, he was still a step too late!
The violently churning water flow was like a water tornado, carrying an irresistible impact and hitting Mandy's forehead hard.
In an instant, Mandy's eyes turned white and water poured into her teeth and nostrils. It was real sea water with a bitter and salty taste.
Unfortunately, Mandy could no longer feel anything. Under the violent impact, his consciousness suddenly stopped and he drowned directly!
As his consciousness faded, all he could see was a huge ghost head, a sharp mouth full of fangs, a high protruding forehead, and bulging eyeballs!
No one expected the sudden change. Bifang drew out the whale harpoon from his waist and swam quickly towards Mandy.
A huge black shadow swam past the two of them at an extremely fast speed, and the churning water was even able to sweep away Mandy, who fainted and drowned, several meters away.
Bifang's flashlight couldn't illuminate its figure at all. It was like a ghost, hovering around the two of them.
Shark electroreception is indeed powerful, but it can only identify the basic size and existence of living things, and it is simply unable to accurately scan the shape of an object like a radar.
It was so fast that it attacked Mandy before Bifang could react.
Bifang swam to Mandy, quickly put the breathing valve back on him, and tightened it tightly.
At this time, Mandy's lungs had already been filled with sea water. Bifang came behind him and used the Heimlich maneuver to squeeze Mandy's lungs.
At this moment, the lingering ghost appeared again within Bifang's perception range and attacked rapidly!
Unfortunately, Bifang is not Mandy. Even if he can't see, he can clearly sense the arrival of creatures and react in advance.
Bifang dragged Mandy, put one foot on the rock wall, and quickly left the original position.
The violent water flow brushed past his forehead, and the pressure created almost pulled Bifang back to his original position. He wanted to swing his knife to attack, but the opponent was so fast that he couldn't stab him at all.
Bifang lowered his head and took this opportunity to finally see part of the "ghost's" appearance!
GT!
Also called Niugang trevally!
An extremely huge Niugang trevally!
Bifang was slightly startled and held the harpoon tightly in his hand. The Niugang trevally is the largest carnivorous fish species in the family of trevally, and can jump out of the water to prey on seabirds.
This guy in front of me is at least 1.6 meters long and weighs more than 70 kilograms!
A 1.6-meter-tall GT can even prey on sharks!
The Niugang trevally is the wild bull of the sea, an extremely powerful aquatic beast whose main features are its steep head and powerful tail.
It inhabits depths between 2 and 80 meters. It is a large coastal migratory fish that is distributed from western South Africa to eastern Hawaii, including northern Japan and southern Australia.
It is often found in estuary areas and mainly feeds at night.
It is greedy and strong, and no other creatures can threaten it except sharks and humans.
With a muscular torso and oversized paddle-shaped pectoral and caudal fins, it possesses real power, explosiveness, and amazing endurance .
The speed in water can reach up to 60 kilometers per hour, while the human limit record is not even 40.
Moreover, the Niugang trevally is ferocious by nature and will catch any small fish it encounters in the sea area, and will even catch birds and baby turtles resting on the sea surface.
When the Niugang trevally finds its prey, it will hit the prey violently to make it faint or swallow it whole in one gulp.
The most terrifying thing is that Niugang trevally often hunt in groups, so they compete for food very fiercely, and it is common for adult Niugang trevally to mistakenly swallow young Niugang trevally.
Is this guy crazy?
How dare you attack humans?
The Niugang trevally is extremely ferocious, but not to this extent, right?
The 70-kilogram Niugang trevally is on the same weight level as humans. It is not common for it to attack animals of the same weight level. It is only likely to occur when food is scarce.
etc.
Is it because of the upcoming dolphin season?
Bifang guessed this possibility. The arrival of the dolphins caused the nearby Niugang trevally to suffer a temporary food shortage.
So, there is really a food shortage?
Bifang calmed his heartbeat and tried his best to sense the surrounding environment. Fortunately, there seemed to be only this one Niugang trevally nearby.
I don’t know when I arrived at Dolphin Bay, and I bumped into Bifang and Mandy who were installing the camera, and even took the initiative to attack them!
The huge impact force knocked Mandy unconscious, thanks to Bifang's timely reminder. If she had not subconsciously twisted her body, she might not have hit the hard forehead, but the fragile back of the head.
At that time, it would not be as simple as fainting, but it is possible to die !
No way.
Bifang took the time to look at the unconscious Mandy. A huge wound appeared on Mandy's forehead, and blood was flowing out.
The bull terrier lingering nearby was ready to launch a fatal attack at any time. Bifang held Mandy tightly with both hands, adjusted the oxygen pressure to the maximum, and squeezed his lungs again.
A large amount of sea water overflowed from Mandy's mouth. Bifang quickly tightened the breathing valve, and a large amount of oxygen escaped and poured into Mandy's lungs.
The second time, the third time.
Mandy probably never thought in her life that as a diving champion, she would actually drown, and even be rescued from drowning in the sea.
The fourth time, the long-awaited Niugang trevally attacked again!
Bifang dodged quickly, but it was inconvenient for him to move as he was holding the heavy Mandy. When he turned around briefly, he was still hit on the arm.
For a moment, Bifang even had the illusion that his arm was broken, and the blood flow in his arm was instantly cut off.
Swelling, numbness, pain.
Wave after wave of strange feelings came over me.
Even the whale harpoon in his hand almost fell to the bottom of the sea.
Bifang could keenly feel that a large number of capillaries in his right arm were broken by the impact, and blood quickly accumulated under the skin.
He tried to hold the dagger again, but it was like a nap that had crushed his arm. When he woke up, he felt pain and numbness and couldn't hold it at all.
No wonder this guy is called water buffalo.
It really is powerful!
Keke on the shore had no idea what was happening in the water. He hid in the dark, not daring to make any sound or light. He carefully looked around to make sure no one came and discovered what they were doing.
The lighthouse not far away still scanned the sea monotonously.
