Chapter 1017 Looking for a Needle in a haystack 3

Chapter 117 Looking for a Needle in a haystack (3) [Ask for a Monthly Pass]

Due to the special environment of marine archaeology, researchers have modified the underground metal detector so that it can also play a role at the bottom of the water, but the effect is much worse than that on the ground.

In fact, this thing looks very simple. It is the top of a metal stick, surrounded by a metal coil. When surveying it at the bottom of the sea, as long as there is metal underneath, they can hear the alarm in the headphones.

Of course, the error of this thing on the ground is about 20%, and the error on the bottom of the sea is even greater, which is not as magical as Zhuang Rui imagined.

After hearing Zhuang Rui's questioning, a diver opened his mouth and retorted, "Mr. Zhuang, we have explored an area of more than 30 meters, but we have found nothing. Maybe the silt layer is too deep?"

It has been more than half a century since the sinking of the "Awa Maru". After sixty or seventy years of washing the sea, it is normal to accumulate more than ten meters of mud. The diver's words made everyone nod slightly.

"Uh... I don't mean to blame you. I mean, after all, it is difficult to grasp the specific location of the sinking of the Awa Maru. Now it is also surveyed according to the site of the last salvage. I think you can expand the scope of the survey, and maybe you will find something..."

Zhuang Rui can't tell the location of the first gold. It's more than 200 meters away from the salvage ship, right? He could not explain, so he could only suggest expanding the search range of divers.

"Alas, if I had known it, I would have been fully prepared and brought the side sonar device..."

Professor Meng sighed, turned his face to Zhuang Rui and said, "Xiaozhuang, your ship is so advanced that it is used for professional salvage. Isn't it without a side sonar system?"

"Teacher, it's really not. Otherwise, the Maritime Bureau must have this object. Call one set urgently, right?"

Zhuang Rui smiled bitterly when he heard the words. The side sonar system mentioned by Professor Meng, also known as "undersea scanning sonar", is an instrument designed and manufactured by using the principle of ultrasonic propagation and reflection in water to detect the seabed landforms.

The submarine scanning sonar consists of transmitter, transducer, receiver, controller and recorder.

When a transducer installed on the probe turns the supplied electrical energy into sound energy and sends sound waves to the seabed at a certain frequency, the sound wave travels rapidly to the sea at a speed of 1,500 meters per second and scatters in a predetermined direction.

When the sound waves reach the seabed, because the landforms of the seabed are diverse, some of the sound waves correspond to the shape, properties and high and low distances of the reflection point, forming different waves that reflect back stinically.

The improved seabed scanning sonar can have a special response to gold and silver substances, so this device is not only limited to marine geomorphology exploration, but also can be used for deep-sea archaeology.

However, Zhuang Rui has these eyes. He never thought that he could not find objects in the sea, so he didn't have to install an undersea scanning sonar system on his luxury salvage ship at all.

Of course, this device is not a panacea. It only reacts to dense gold and silver materials. If the wreckage of Awa Maru is decomposed badly, it is useless even if it is equipped with seabed scanning sonar.

"There are some in the bureau, but it will take at least two days to ship it from Beijing..."

Director Wu agreed with Zhuang Rui's opinion. Anyway, all the cost of salvage this time will be borne by Zhuang Rui, and it doesn't matter if he stays for a few more days.

Zhuang Rui nodded and said, "Teacher, Director Wu, I think we should still use metal detectors to detect while waiting for the sonar device. Can't we be idle?"

Zhuang Rui's words made the divers of the Maritime Administration deeply resentful. It is an extremely physically exhausting thing to dive dozens of meters of seawater, and diving for a long time will also have an impact on chest and lung function, which is very easy to cause some occupational diseases.

There is no high technology, and they still enslave these divers. Of course, these brothers are not happy, but Zhuang Rui is the deputy commander-in-chief of this salvage operation. Even if he has a name, it is not something that these staff can disagree with.

"Well, what Xiaozhuang said is reasonable. Let's expand the search scope and try to find something as soon as possible..."

With an official tone, Director Wu was naturally familiar with the road. Anyway, he didn't want him to go into the water. He nodded and agreed with Zhuang Rui's opinion.

Professor Meng returned to the salvage site more than 20 years ago. Naturally, he wanted to find the wreckage of the Awa Maru as soon as possible. He nodded and said, "Thank you for your hard work. The coordinates of more than 20 years ago will definitely change. Let's expand the search range to about 100 meters..."

Several leaders spoke. Although the divers were reluctant, they still put on their diving suits again, but to their surprise, Zhuang Rui actually also wanted a set of diving equipment and put them on there.

Professor Meng also saw Zhuang Rui's behavior at this time and asked in surprise, "Xiao Zhuang, what are you... doing?"

Diving requires professional training, especially deep-sea diving. The water pressure at dozens of meters is enough to kill people with no diving experience, so Professor Meng is very puzzled by Zhuang Rui's behavior.

"Teacher, I have the experience of salvaging sunken ships in the Song Dynasty. I know more about the performance of ships at the bottom of the sea. Let's go down and have a look..." Zhuang Rui casually found an excuse.

"Oh, Xiaozhuang, this diving can only be carried out by professionals. Don't fool around..."

Although Zhuang Rui's courage is commendable and his behavior is also worthy of praise, this is not a joke, especially the ever-changing seabed, which may be in danger at any time.

"Teacher, it's okay. When I was looking for the pirate island, I could dive 20 or 30 meters deep with my bare hands. This sea area is only more than 40 meters, and there is no problem at all..."

Zhuang Rui laughed when he heard the words. Now the record of time snorkeling seems to be 105 meters. With Zhuang Rui's physique, he dare not exceed this record, but it is only 30 or 40 meters deep, which is not challenging for Zhuang Rui at all.

What's more, there are pressure-reducing diving suits and a series of diving equipment. Zhuang Rui really wants to see the scenery at the bottom of the sea. What's more, if he can't go down, I'm afraid he will have to wait for two days at sea.

"Well, then be more careful. If you feel any discomfort at the bottom of the sea, come back immediately..."

Professor Meng remembered what Zhuang Rui did at sea. He had no doubt about what he said, and he didn't say much at the moment. After all, a person with experienced archaeology accompanied the survey, and the probability of finding the wreckage will be much higher.

Seeing Zhuang Rui, the deputy commander-in-chief diving with them, several divers did not complain. After Zhuang Rui put on his wetsuit, he taught Zhuang Rui how to use the propeller.

They use a single-person propeller, which can speed up the diving speed. This object is easy to operate. After listening to it, Zhuang Rui almost understood it.

"Honey, be careful..."

Qin Xuanbing also heard the news that Zhuang Rui was going to the sea and ran over with Fang Fang Yuanyuan. Yesterday's storm that ravaged the middle of the night really made Qin Xuanbing a little scared.

"Well, what's the matter, wife, the scenery under the sea is beautiful, why don't we go down together?"

If Zhuang Rui didn't care, he immediately let his glasses fall off the deck. Just now, he thought that Zhuang Rui was noble, but who knew that this buddy went to the bottom of the sea tour style? And it's not enough to go by yourself. Do you still want to take your wife with you?

"Stinky boy, it's still a joke..." Professor Meng scolded Zhuang Rui with a smile, and everyone reacted. Dare Zhuang Rui is to prevent his wife from worrying?

Knowing that Zhuang Rui was joking, Qin Xuanbing was not very nervous. After telling Zhuang Rui a few words, she saw Zhuang Rui get off the ladder.

In fact, when it comes to the scenery, this sea area near the coastline is really not good. Compared with the pirate island at that time, it is simply far from the sky. In terms of water quality alone, there is no comparison between the two.

With the propeller down into the sea, Zhuang Rui grabbed the handle on the propeller. After turning it up, the propeller at the tail of the propeller turned up and took Zhuang Rui to the bottom of the sea.

There was an oxygen bottle on his back, an oxygen mask on his face, and a walkie-talkie-talkie next to his ear. Except for feeling a little cool when the water depth of more than 20 meters, Zhuang Rui did not have any uncomfortable reaction, which also made the people guarded next to the monitor on the ship breathe a sigh of relief.

From the surface of the ocean to the depth of 200 meters, it is called the upper layer of the ocean in terms. In this range, sunlight can penetrate the sea water. The water layer from 200 meters to 1000 meters is called the middle layer of the ocean. The sunlight here cannot all pass through the sea water. The light is very weak, and the sea water is gray

The water layer from 1000 meters to 4,000 meters is called the semi-deep sea layer. There is no sunlight here. It is a dark world

Zhuang Rui and others only dived to a depth of 40 meters. After reaching the bottom of the sea, they could clearly see the surface of the seabed even if they did not need to turn on the strong light. However, out of careful consideration, as soon as they reached the bottom of the sea, they turned on the headlights on the propeller.

"Each person is responsible for the 50-meter range, and dive immediately when you feel that there is not enough oxygen..."

After seeing Zhuang Rui and five others go to the bottom of the sea, the diving command monitored above gave orders to several people. Because the oxygen consumption in the compressed air bottle carried by each person was determined according to the water pressure depth and other reasons.

Although several people use large bottles, at the bottom of the sea of 40 meters, it can only last for about an hour at most, and the oxygen at the bottom of the sea is exhausted, so it is needless to take it.

"Underd..."

After answering first, Zhuang Rui made a gesture to the rest of the people, indicating the direction of the survey, and then used the propeller to turn and swam to his target.

With the help of the propeller, Zhuang Rui saved a lot of time. After just a few minutes, he came to a place about 200 meters away from the cruise ship.

(: the second update, the effect of the single chapter is not ideal, everyone has recommended votes and more support) RO