In order to maintain communication, it is necessary to use wired communication means such as cable. However, in complex water environment, it is not only difficult to ensure the normal operation of cable, but also easy to become a burden to divers

"A little bit," replied Koran. He took a few deep breaths and tried to calm himself down as much as possible.
"Although the dive was 100 meters this time, there was an injection booster in the dive for safety … but I hope you don’t know this thing," said the hound.
Injection pressurizer is the standard for this kind of deep diving. When the general diving depth is more than 400 meters, it is already possible to ensure the diver’s life safety by pressurizing that depth only by deep diving gas. This injection pressurizer must be used to adjust the body pressure and, if necessary, be used together with muscle enhancer.
But after all, human beings are not deep-sea creatures. Without that kind of earth, excessive body pressure can easily lead to organ damage and bleeding. Even with all kinds of protective measures, the injection booster can’t last more than an hour.
Of course, high-level biochemical transformation people can see this problem to a certain extent. Guys like Leighton can last at least four or five hours.
"The low-light camera and infrared camera are working normally, and the miniature camera is ready to dive."
Chapter sixty-nine Water maze
The engine of the deep submersible makes a slight buzz, and the air in the airbags on both sides is discharged at a uniform speed. With the buoyancy drop, Kelan slowly sinks to the depths.
"Di-the first communication test"
Liao Lang gently paddled his arm and pulled Kelan for a distance, and the communication signal between them also weakened rapidly in the process until about 25 meters, leaving a murmur in the channel.
"At the end of the test, the limit distance of AF-6 one-to-one communicator is 22 meters at the water depth of 10 meters."
AF-6 is the most powerful portable line communication equipment they can purchase. Alpha has no strong interference sources on land and does not rely on communication base. The limit distance of one-to-one communication can reach 1,400 meters, but the distance of water is compressed to 22 meters.
The magnetic wave in the water will be seriously attenuated, and the data that Alpha Xinghai water contains a lot of radiation interference can be 22 meters is not easy.
Communication equipment in learning will also be affected. For example, Kelan carries a miniature, and the effective distance is about 100 meters, which is why they choose the number of 100 meters for diving test.
Liao Lang swam up to Kelan than a gesture of "everything is normal" and they continued to dive.
The light that can penetrate the seawater is getting less and less, and the surrounding environment is already dark.
Neither Kelan nor Liao Lang have photographic equipment. This kind of environmental light source is really too eye-catching, which will easily attract hunters who are very sensitive to light-darkness can be disguised as them, although it is full of unknown dangers.
Of course, they still carry the photo equipment, but this equipment is not hand-held, which makes this way too dangerous, which is equivalent to actively exposing their position. The correct method should make the compressed gas eject the photo, and if necessary, it can even attract the attention of sea animals in this way and wait for an opportunity to escape.
But no light doesn’t mean that Kelan is completely blind. Hearing is far more important than vision …
The belt-hanging mini-nano will emit ultrasonic waves in all directions every three seconds and draw the three-dimensional image of the surrounding environment through analyzing the received echoes. But so far, the only "abnormal object" around except seawater is to dive with Kelan.
"It’s ten meters deep. What’s your status?" Kelan asked Liao Lang that although the other party didn’t wear a closed helmet, he could communicate through laryngeal bone vibration even if he didn’t open his mouth.
"It’s a good thing that I didn’t feel after this water pressure." Liao Lang’s head leans towards his arms and his legs are close to his sides, swinging like fish’s tail fins-unlike Ke Lan, who needs external force, it seems as if there is no resistance for him to float or dive. His body is like a part of this seawater and the seawater is an extension of his body.
"It’s 90 meters." Kelan glanced at the depth gauge and filled the airbag with gas, so that gravity and buoyancy could be in a balanced state, and he could maintain a stable depth in the water.
"Did you find anything?" Liao Lang swam behind Kelan and grabbed the shoulder buckle of the deep dive-although it was far from his limit, he had to keep his physical strength as much as possible out of caution. Anyway, the deep dive was driven by the propeller, and it would never dry up without the power.
"No, nothing has been swept here, and there is still a long way from the seabed." Ke Lan stared at the image in front of him and said, "Now the second step is to explore the horizontal layer."
"Although this is a relatively safe area, we still have to keep alert-"
All of a sudden, Koran decided to stay where he was, and the words "alert" and "admonition" got stuck in his throat, so he couldn’t say anything.
Just less than two meters in front of him, a huge eye was staring at him, the size of a heavy truck hub, and there was a dark green light in the pupil.
"thump"
Kelan swallowed some water with difficulty. His finger had already pulled the trigger of the "shark hunter" machine gun, but he knew very well in his heart that it would be difficult for his weapon to cause any substantial damage to this size creature …
"Liao Lang … run away. I’ll find a way to stall this thing." Kelan said in a low voice.
There was silence in the darkness, even the green eyes did not move.
"Liao Lang?"
There is no answer … The original post Liao Lang behind him has disappeared at the moment.
"Damn …" Kelan clenched his teeth. He believed that Liao Lang would never run for his life alone without saying a word. This situation can say one thing-Liao Lang may have lost his ability to warn before he noticed something strange …
Staring at his giant eyes did not move, but Kelan felt that the black sea water around him seemed to become more and more viscous, and he was like falling into a swamp. Thick peat wrapped his trunk and limbs and dragged him into the abyss little by little …
It seems that there is a hand that keeps pinching his throat, and the pain of suffocation keeps pouring in. Kelan wants to struggle, but his hands and feet don’t listen to him. Some strange hallucinations flash across his eyes quickly. He seems to see the pyramid-shaped altar of the glacier … huge sarcophagus, broken stone tablets, humanoid monsters covered with blood …
No! It’s an illusion! All this is an illusion!
Koran suddenly a sense of shock and suffocation suddenly disappeared … Is that huge eyes but still less than two meters away from him.
"This is …"
Koran got a little closer, and then he realized that the huge eyes turned out to be statues made of rocks!
And those dark green dim light come from a luminous mineral embedded in the statue’s pupil.
The process of making this statue is very exquisite. From which angle Kelan has seen this giant eye, it seems to be in his eyes. Even if Kelan goes around the back of the statue, there are exactly the same giant eyes staring at him in the dark.
The main body of the statue is a stone pillar with four or five people hugging each other, but what makes Kelan wonder is that the depth here is only 100 meters. If the seabed at the bottom of this stone pillar is too high, isn’t it?
Out of curiosity, he fired a flare at the statue-
The strong light released by metal burning suddenly lit up a large area of water, and the wreckage of a huge city suddenly appeared.
"How is that possible? !”
Kelan consciousness held her breath and her face was full of horror.
That’s impossible!
The ruins of Haidicheng are more than 2000 meters deep, but Kelan is less than 50 meters away from it!
Besides, the system didn’t detect an echo …
At the thought of it, Kelan realized that the original three-dimensional image of the eyepiece had long since disappeared. Except for the propeller, all the equipment, including all kinds of cameras, recording instruments and miniature sonar, had stopped working. After counting the failed figures, they jumped wildly for thousands of meters …
Everything is no longer normal since the stone pillars carved with giant eyes appeared and Liao Lang disappeared.
Is this the ruins of the underwater city?

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