The experts at the Pentagon were right.
If the Humpback Whale wanted to return to Zhongyun City, it would naturally go south along the African continent and finally pass through the side of Madagascar Island.
However, on both sides of Madagascar Island.
Two Burke-class guided-missile destroyers and four frigates have been lined up in a battle formation on both sides of the sea.
Each blockade line is centered on the Burke-class guided-missile destroyer. The two frigates are responsible for dropping sonar buoys, and the Burke-class has released the big killer, the SQR-20 active passive towing sonar system.
In their naval formation, there is no specialized anti-submarine ship.
Now the functions of warships are modular and diversified. According to the tactical equipment carried by each warship, a sea, land, and air network is formed to form an unbreakable anti-submarine network.
Sky Force is two
P-8 anti-submarine patrol aircraft.
However, the commander of the joint fleet, Lassiter, believes that the submarine of Monster Industries will take at least three to four days to sail from the Nigerian coastal port to here.
So they just started to set up sonar detection equipment in advance and waited until the day after tomorrow, the anti-submarine patrol aircraft would arrive here to patrol.
There is no anti-submarine patrol aircraft, but they have anti-submarine helicopters.
Whether it is a guided-missile destroyer or a frigate, they can carry military helicopters to perform missions. This time, they all brought anti-submarine helicopters without exception.
"Plop ~", "Plop ~", "Plop ~" …
Orange-Red buoys that looked like fire extinguishers were thrown into the sea by helicopters or frigates at predetermined distances.
These orange-red buoys were in the shape of fire extinguishers, and they fell into the sea and splashed insignificant waves.
The sonar buoys remained upright and floated in the water. The activation device detected the presence of seawater and immediately ejected the sonar base array from the shell. It was connected by cables and slowly sank to the predetermined working depth under the action of gravity.
At the same time, the sonar buoys also sank into the water, and only a small palm-sized fan-shaped signal receiving antenna protruded from the surface of the sea.
The sonar buoys were the "big net" of this [Whaling Operation].
These sonar buoys had a detection range of about 15 kilometers. The fleets on both sides of Madagascar Island had densely placed more than 300 sonar signal buoys in this sea area.
They formed an airtight detection net underwater, quietly waiting for the arrival of the submarine of Monster Industries.
In the evening, all the sonar signal buoys were deployed.
In the command room of the two Burke-class guided-missile destroyers, red signal nodes that covered every corner of the electronic nautical chart that represented their mission area lit up one after another.
These nodes transmitted the collected sonar information to the command ship at a frequency of once every two seconds.
The signal was transmitted by short-range radio transmitters on the sonar buoys, which emitted high-frequency digital signals. The channel capacity was large, but the penetration was poor, and the signal attenuation was serious.
The signal could only be transmitted within the mission area, and it had to be equipped with a corresponding receiving antenna to eliminate the possibility of the signal being detected by the outside world.
Four hundred sonar buoys transmitted a message every two seconds.
Since this was one of the African Continent's waterways, the sonar buoy quickly scanned multiple [Mechanical Sound Sources], and through the time of the sound source detected by the adjacent sonar buoys, it was able to triangulate the exact location of the sound source.
The trajectories of the giant ships appeared on the enormous electronic battle map.
Modern sonar technology had been completely digitized.
It was like a scene in a naval battle movie, where the sonar monitor sat in an airtight soundproof room and relied on headphones to listen to the sound. It couldn't be said that it had completely become a thing of the past, but it definitely wouldn't appear before the general location of the target was confirmed.
At this time, in the command room, the sonar personnel in charge of the sonar information were taking a sip of coffee from time to time, leisurely adjusting the equipment.
The target of the sonar monitoring was all the sounds in the ocean.
Whether it was the waves, whales, dolphins, fish, and ships made by humans of all sizes, they all made their own unique sounds in the sea.
Among them, the sound of the ships made by humans was the most regular.
The sound of the propellers rotating and hitting the water splashing, the sound of the cylinders of large engines crashing back and forth.
These countless sounds gathered together and were transmitted to the mothership by the sonar. There was no need to think about distinguishing them. A special information processor would automatically match these sound sources according to the information in the voiceprint database.
The sounds of marine life and waves were filtered, and the sounds of mechanical movements made by humans were marked in detail.
In addition ~
These ships marked by the sonar would also be scanned by the advanced shipboard radars on the frigates and destroyers.
The radar could detect the outline and speed of the ship. Civilian ships were fundamentally different from military ships, whether it was the mechanical power model or the speed of their appearance.
Therefore, the hundreds of kilometers of sea on both sides of Madagascar were under the control of the warships of the [Whale Hunt Operation].
..
The commander of the joint fleet, Lassiter, was sitting on the Burke-class guided-missile destroyer on the southern side of the sea.
Although the previous meeting estimated that there was only a 10% chance that the submarine from Monster Industries would take this side. But Lassiter felt that this 10% was likely to bring him a surprise.
Radio silence didn't mean that all the ships had disappeared from the vast sea without a trace.
Modern warfare was all information warfare. If they lost contact with the headquarters, wouldn't it be equivalent to fighting alone?
Even if the radio wasn't available, they still had a satellite data link.
Satellites in space would continuously send data to the vast sea. The warships that carried out radio silence could passively receive information from the headquarters through satellite receivers.
Passive reception couldn't be detected.
Lassiter had already received the latest satellite photo of the port from the headquarters. In the photo, the strange black submarine had disappeared.
It was noon now. In another three to four days, the submarine would crash into the encirclement.
Lassiter felt that there was plenty of time, and he could take advantage of these few days of rare leisure to rest.
After handing over the duty, Lassiter had just stepped out of the watertight door of the command center when someone shouted, "Wait, Sir."
Lassiter moved back and glared at the person who called out to him.
"Sir …"
The person stood up shyly. "Our shipboard passive sonar detected an abnormal voiceprint."
"How abnormal is it?" Lassiter walked forward with some displeasure.
It was common for sonar to detect abnormal voiceprints, especially the large sonar base installed under the bow of the destroyer. If the destroyer was stationary, it could even collect abnormal underwater voiceprints within a radius of thousands of square kilometers.
The premise was that the voiceprint was especially loud and could be transmitted very far.
"Very special." The person only dared to stare at the screen. "Sir, we've never recorded this voiceprint before. We've never even seen it before."
"It … It gives off the feeling of a supercar running wildly on the sea."
"Are you sure?"
"I'm sure …"
Lassiter quickly stepped forward. "What's the distance of the abnormal voiceprint?"
"Between 500 to 700 nautical miles." As the person reported, he handed Lassiter a monitoring headset.
Sonar's detection range and detection accuracy had always been a technical contradiction.
The large sonar installed under the destroyer could detect abnormal voiceprints from very far away, but it couldn't use the voiceprint to lock onto the exact location of the sound source. It could only give a vague estimate of the location.
The sonar buoys that were placed in the surrounding hundreds of kilometers of sea had an extremely short detection range, but their detection accuracy was higher than radar.
In addition, they also had the ability to collect voiceprints.
Lassiter put on the monitoring headset.
Then, he heard the abnormal voiceprint that had been filtered by the processor.
Those who hadn't received professional training wouldn't be able to tell what was wrong with the voiceprint that had been specially labeled as abnormal by the processor.
When ordinary people heard it, they would only hear a buzzing sound that was similar to electric current.
But Lassiter had received professional training. Even if his training wasn't long, he could still detect the abnormality in these electric current sounds.
It was a repetitive mechanical sound with an extremely high frequency.
The person was right. It sounded very similar to the roar of a supercar's engine.
But!
But if the target was a speedboat that had been installed with a professional high-speed engine and was being driven by a certain tycoon …
It couldn't be transmitted underwater for hundreds of nautical miles.
The structure of a ship determined the power of its engine and the size of its propeller.
The smaller the power and size, the smaller the sound source's transmission would be.
Unless …
Unless the target was an ocean-going ship that weighed more than ten thousand tons.
For a ship that weighed more than ten thousand tons to emit the sound of a supercar's engine, wouldn't that be a joke?
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