Entering the bar, the loud music suddenly began to hit my eardrums.

Now there are a lot of people in the bar. On the middle stage is the DJ twisting his body, and on the surrounding high platforms there are dancers with cool clothes and hot figures dancing. There are many people drinking. Some people are twisting in the booth to the music, and some people are dancing in the booth.

Waving your arms in front of the DJ.

The two people who led the way did not stop in the bar, but passed directly through the dark and noisy area. They arrived at a small door that was only for employees and no outsiders were allowed to enter. They opened the door and motioned for Gao Yi and Serkin to go in.

When Green and Lucy wanted to follow in, they both extended their hands.

Serkin was alone, Gao Yi also brought two followers, but he was stopped anyway.

Green and Lucy were led to a booth, where drinks were already placed. Gao Yi looked back, nodded, and then followed Serkin inside and continued along a narrow passage.

After passing through the narrow passage and entering the office area, the person leading the way sent Gao Yi and the others directly into an unmarked room.

It was like a conference room, but a bit crude. There was a long table made of the simplest office desks, and a dozen chairs beside it.

There was already someone in the room, a middle-aged man in his fifties. He looked very nervous, very nervous.

When Gao Yi and Serkin entered the door, the person who brought them immediately said: "Tell me to pick them up and you can communicate."

After saying that, he closed the door, leaving only the middle-aged man in his fifties, Gao Yi and Serkin.

Serkin spread his hands and said calmly in Russian: "Where are the things?"

The middle-aged man pointed to the ground. Gao Yi and Serkin walked around the long table and found two black handbags at his feet.

"Where's the money?"

Serkin patted the small bag he carried with him and said: "I brought the money. We will inspect the goods. As long as there is no problem with the goods, we will pay immediately."

The middle-aged man looked at Gao Yi, then looked down at the bag he had brought. After hesitating for a moment, he immediately stepped back and said, "You guys inspect the goods."

Now Gao Yi is not curious about anything else, he is curious about how much money can be in a small bag!

It seems that this is the real seller, but the problem is that this seller is obviously not professional.

Serkin said seriously: "You go next door and wait while we inspect the goods. Don't worry. As long as there is no problem with the goods, you will pay immediately after the inspection."

At this point, the seller obviously had no choice. He hesitated and whispered: "Okay, how long will it take?"

"Soon, just wait a moment."

After speaking, Serkin opened the door again and said to the person who sent them in: "Take this gentleman to wait next door and invite our guests in."

There was no nonsense, the process was very smooth and very, very simple.

There was no mystery or deliberate obstacles. The entire transaction was carried out according to the simplest process, rather than as shown in the movie, where the transaction seemed to have been deliberately added in order to fail.

The door was closed again. Gao Yi and Serkin were speechless. Then, Serkin simply sat down on the chair, bent down and opened a bag, and then said: "There are a lot of things, and they are quite heavy. I have to supervise you."

Inspect the goods. If there is no problem with the goods, give me the money and I will pay the seller."

Gao Yi nodded, he called again, and after waiting for the answer, he whispered: "Someone will bring you in, just follow."

Only five minutes later, the door opened again.

The person leading the way still didn't enter the house. Only Huang Haisheng and three experts who inspected the goods did.

Huang Haisheng seemed to be doing everything as usual, but the three experts seemed a little nervous.

Serkin had no intention of greeting them. When he saw the three people entering the room, he bent down and unzipped the two bags.

One bag contained paper documents, all packed in sealed archive bags, and the other handbag contained large tapes and boxes of vinyl records.

Serkin spread his hands, and then he reached out towards the opened bag and made a gesture of invitation.

No need to say a word more.

Huang Haisheng nodded, walked over, randomly pulled out three file bags, put them directly on the table, and took out a few boxes from the bag full of tapes with his other hand.

The old expert sat on the chair. He first read the seals on several file bags, then immediately took out one of the file bags and whispered: "Can it be opened?"

"Can."

The old expert exhaled and opened the file bag with slightly trembling hands.

The fifty-year-old expert didn't bring any instruments, but the middle-aged sonar soldier took out a flat machine that looked like a record player but was much smaller than a record player from his backpack.

.

The old expert opened the file bag, and there were only three pieces of paper in it. But the old expert just took a look at it and immediately whispered: "Type 209 conventional submarine, no problem!"

He picked up another file bag and opened it casually. There were three thin pages inside.

The old expert took a look. He was holding a drawing in his left hand. There were circles of lines on the drawing. Gao Yi took a glance and found that he couldn't even see the pattern on the paper clearly.

"Oyashio-class submarine, no problem! The characteristics are consistent, clear, and the correspondence is correct."

The old expert put down the second file, but he did not open the third file. Instead, he said to Huang Haisheng: "Take two more files at random."

Huang Haisheng took two more portfolios, and the veteran expert couldn't wait to take them, but he seemed not satisfied, and then said to Serkin: "Can I select samples for inspection by myself?"

Serkin nodded and made a gesture of invitation.

The veteran expert began to flip through the handbag filled with archives. Gao Yi discovered that there must be at least several hundred archives in this bag.

Having these voiceprint maps is enough!

At this time, the sonar soldier's machine was ready.

I picked up a record and there was a logo on the box.

Start playing the recording of the record.

The sound was not very loud, and no headphones were used. Both sonar soldiers stood in front of the player. When the sound came out, the young sonar soldier immediately said: "MGK-400EM passive sonar, Qianhai."

Gao Yi heard the sound, it wasn't too noisy, just vaguely like a jumping sound.

"Los Angeles-class nuclear submarine!"

The two sonar soldiers spoke at the same time. They looked at each other, then nodded excitedly, and then said to Huang Haisheng, "No problem!"

This is a record of the MGK-400EM passive sonar. All recordings collected by this type of sonar are in this one record.

Why did they use this record for identification? Because this type of sonar is made in Russia, and Tokyo University also has it.

So they can determine whether the sound recorded in this sonar is real or fake.

"Change to active sonar."

Another record box, this time a collection of active sonar, MG-519EM sonar recordings.

Submarines are different. Each type of submarine has its own unique voiceprint, so it is called sonar fingerprint. Sonar models are also different, and their performance is also different. The sound recorded by different sonar will be different.

Some background noises are loud, and some background noises are small.

It is of course much more convenient to make judgments using sonar that you are familiar with.

The sound of the active sonar was different this time. Gao Yi heard an obvious banging sound, which was the echo after the sound waves emitted by the active sonar encountered obstacles.

Gao Yi could only hear a huge banging sound, but the sonar soldier immediately said: "Los Angeles-class attack nuclear submarine, no problem!"

How do these ears hear?

At this moment, the old expert raised his head and said immediately to Huang Haisheng: "No problem! There is no fraud, everything is true..."

When he said it was all true, the veteran expert's voice trembled.

There is no need to say more, just confirm the authenticity. After all, this is not a popular science.

Huang Haisheng immediately said to Gao Yi: "There is no problem with the goods, we will pay."

Gao Yi nodded and said, "Okay."

Huang Haisheng took out his phone. He didn't say anything, but just sent a message.

Putting away the phone, Huang Haisheng said gently: "The payment will arrive in ten minutes. Can you give us ten minutes to receive the goods here?"

Serkin nodded and said nothing.

Huang Haisheng made a gesture, and then he took out a camera that looked like a digital camera from his pocket.

"Let's get started."

Huang Haisheng said lightly, and then pointed the camera at the old expert.

It looks like a camera, but it can’t really be just a camera, right?

The old expert picked up the file bag and took out a small flashlight from his pocket. He turned on the flashlight and the light was very dazzling. Then he placed the file bag in front of the strong light.

Huang Haisheng pointed his camera at the old expert. The old expert did not open the sealed file bag. He pointed it up and down, and the whole process took less than two seconds. Then he put the file bag down and took out another file bag.

The sonar soldier began to unpack the record and put the record in the flat box, but this time there was no sound. If there was any sound, it was a slight buzzing sound made by the record rotating at super high speed in the machine.

What is this doing?

Gao Yi looked at Serkin, only to find that Serkin also had a confused look on his face.

Taking photos through a portfolio?

Put the record into the machine and spin it once. The whole process ends in less than five seconds, and then the record comes out?

One of the two sonar operators was unpacking the record box and the other was loading it. Their hands could not keep up with the speed of the machine.
To be continued...