The submarine squad lingered on the seabed in the Gulf of Mexico for more than a week, secretly laying dozens of sets of tailwind-ear sonar submarines inside the bay.

The nearest submarine is even less than 30 kilometers of the coastline.

As the Gulf of Mexico is included in the monitoring range of the tailwind ear system, it means that the southern coast of the United States extends about 2,000 kilometers northward, are all within the monitoring range of the tailwind ear system.

Sure enough, after the arrangement of each submarine, the Qin Qiong connected the buoy and the astro disk satellite communication system to transmit a large amount of sonar data to the supercomputing center in the South Pacific.

When the submarine squad left the Gulf of Mexico and entered the more complex Caribbean Sea, Song Yaomin received updated data one after another.

He looked at the three-dimensional terrain model, the southern coastal area of ​​the United States that was filling little by little, and even saw the hidden underground brain wave laboratory in Austin, Texas.

To determine whether an underground space is artificial and its internal purpose is a major subject that has gradually emerged in recent years - vocalprint analysis.

To determine whether it is an artificial underground space, it mainly depends on the shape of the space in the space, whether there is a large amount of liquid, and whether there are complex local sound sources.

Obviously, the underground space in the suburbs of Austin is in line with the uniform internal space, without a large amount of liquid and with complex sound sources. This is one of the special products of artificial underground spaces, and it is a densely populated underground space.

There are no less than a few hundred similar underground spaces found in the entire southern region. Except for some of them, some of which are subways and bases with certain names and uses, the rest are not disclosed.

Obviously, these underground spaces are all powers that Noah will hide.

Song Yaomin only received data updates from the three-dimensional terrain model, but there was a different situation in the data center of the South Pacific.

At this time, a super-large data center was established in the Solomon Islands, which was used to analyze sonar data obtained by the tailwind ear system around the world.

The data center is equipped with 5 supercomputers with 400,000 Gigabit floating-point computing power, with more than 2,000 related researchers and staff.

Inside the base.

Data analysis work is divided into studios according to each area.

The studio in charge of the Gulf of Mexico is listed as the Gulf of Mexico Studio.

Since a large part of the area in charge of the studio is the core area of ​​the Noah Society, the studio has a large number of people, reaching more than 80 people.

With the assistance of the voiceprint analysis system, analyst Le Zhicheng took the details bit by bit and then repeatedly verified the situation.

Xiao Yun, a female colleague next door, was responsible for restoring underground vocals. Suddenly, Xiao Yun frowned and found that there were a large number of repeated high-frequency vocals in the underground base in the suburbs of Austin.

Enter several commands on the keyboard, and the system quickly classifies the voice patterns in the area.

[Suspected words: bastard, Spanish, 385 times included...]

[Suspected words: bastard, English, 243 times included...]

[Suspected words: God, Spanish, 204 times included...]

[Suspected words: Devil, Spanish, 511 times included...]

She quickly combined some intermittent sentences based on words, time and frequency. Xiaoyun's major was Spanish and English. After coming here to work, she learned some knowledge of vocal pattern analysis.

Through these intermittent sentences, she quickly pieced together a lot of information.

In the analysis report, she wrote down a line of analysis results: there are about 300 to 500 Spanish-speaking Latinos in the underground space, which are suspected to be human experimental bases.

Lezhicheng also discovered through some data that ultrasonic type medical equipment is used in the base.

However, since the closest tailwind ear sonar to Austin has reached 472 kilometers, there are a lot of deficiencies and distortions in the sound waves. If you want to obtain the area, the most realistic situation must be close, and it is best to enter within 5 to 10 kilometers.

Within 5 to 10 kilometers, using a tailwind ear sonar, due to the characteristics of sound amplification in the underground space, you can even hear normal internal dialogues clearly.

It is obvious that it is not very difficult to sneak into the vicinity of Austin and carry a tailwind ear sonar, especially in recent years, Noah has become more and more cautious about Chinese people.

However, Le Zhicheng and Xiaoyun did not think too much about this matter. This kind of thing was left to the intelligence department for a headache. They could only analyze the voiceprint data.

At present, the west coast and the south coast of North America are closely monitored by the Shunfeng-Ear Sonar system, and basically every move cannot escape the palm of the intelligence department.

Chu Xuan, who had just come to the Solomon Islands from Darwin's headquarters, read the detection data of the underground base in North America. He stood in front of the three-dimensional map and fell into deep thought.

This three-dimensional map simulates many details on the west and south coasts of North America.

Zhang Fen, the head of the base next to him, did not make any noise to disturb him, but instead sorted out some information.

Suddenly, Chu Xuan's eyes were stuck in the underground water layer in North America. He said, "Base Zhang, please mark the underground water layer, underground river and caves in North America."

Zhang Fen hurriedly instructed the staff to mark the underground water layer, underground river and caves in blue.

After the groundwater layer, underground rivers and caves are marked, it is simply an underground ocean, and it is a well-connected underground ocean.

Chu Xuan's eyes suddenly lit up: "If we can use these underground water layers, we can get close to each other quietly."

Regarding this idea, Zhang Fen reminded: "However, when the submarine enters the groundwater layer, there is no way to communicate with the outside, unless it is driven manually."

“Both radio and ultrasound are difficult, but that doesn’t mean there are no other solutions, such as fiber optics.”

"Fiber Optical?" Zhang Fen suddenly realized.

If fiber optic communication is used, underground restrictions can be ignored, and since it is difficult to find fiber laying on the surface deep underground.

Chu Xuan thought for a while and discussed the feasibility of this plan with several relevant researchers.

Theoretically speaking, the difficulty of laying optical fiber lines in the groundwater layer lies in understanding the detailed status of the groundwater layer.

The Sunwind-Ear Sonar system has obtained huge data on North American groundwater layers, which extends inland for at least 1,000 kilometers on the coastline. The groundwater layers in this area are relatively clear and accurate.

In addition, the submarine can also be equipped with active sonar, which brings great help to underground navigation.

During the process of laying optical fibers, the submarine can be connected to the optical fibers, manually controlled the submarine, and approached inland little by little.

After completing the feasibility verification of the technology, Chu Xuan decided to split into two groups.

Study the details of North American groundwater layers along the way and find out the appropriate submersible route.

On the other hand, an optical fiber laying experiment for the underground water layer was conducted in the Australian underground water layer to be used as technical verification.

As the head of the Australian branch and eradicator, Chu Xuan can mobilize a lot of resources, and he can also apply for support from the Suiren Division.
Chapter completed!