Monster Factory

The Pentagon experts were right.

The humpback whale wants to return to Zhongyun City, naturally passing south along the African continent and finally from one side of Madagascar.

At this time, however, on both sides of Madagascar.

Two Berk-class missile destroyers and four frigates have been lined up in battle formations on both sides of the ocean.

Each of the blockade lines is centered on a Berk-class missile destroyer, with two frigates responsible for delivering sonar buoys, while the Berk-class releases the Big Killer - the SQR-20 main passive drag sonar system.

There are no specialized anti-submarines in their naval formations.

The capabilities of warships are now modular and diverse, and based on the tactical equipment on board each warship, a network of land, sea and air is formed to form an unbreakable anti-submarine network.

Sky Force, two P-8 anti-submarine patrol aircraft.

However, Joint Fleet Commander Rashid believed that the submarine of Giant Beast Industries would take at least three to four days to navigate from the Nicaraguan coastal port.

So they just started arranging sonar detection equipment in advance, and they waited until a later date before the anti-submarine patrols arrived and started patrolling.

Without anti-submarine patrols, they also have anti-submarine helicopters.

Both missile destroyers and frigates can carry military helicopters on mission. This time, they all brought anti-submarine helicopters, without exception.

“Putong ~”, “Putong ~”, “Putong ~” …

An orange red buoy, like a fire extinguisher, was thrown into the sea by helicopters or frigates at a predetermined distance.

These orange red buoys are extinguisher-like cylindrical shapes that splash a tiny wave into the sea.

The sonar buoy remains in an upright position and floats in the water. The excitation device detects the presence of sea water and immediately pops the sonar base array out of the housing, connecting it by cable, allowing the sonar base array to slowly sink into the predetermined working depth under the influence of gravity.

At the same time, the sonar buoy also sank into the water, detecting only a small patch of a large fan-shaped signal at the surface of the sea to receive the antenna.

The sonar buoy is the “big net” of this [whaling operation].

These sonar buoys range around 15 kilometres, and fleets on both sides of Madagascar have densely dropped more than 300 sonar signal buoys in this area.

They form a densely ventilated detection network underwater, quietly awaiting the arrival of the submarine of Giant Beast Industries.

By evening, all sonar signal buoys had been put in.

In the operational command room of the two Burke-class missile destroyers, an electronic nautical chart representing their mission area was also lit, sequentially, with a red signal node in every corner.

These nodes transmit their captured sonar information to the command ship at a two-second frequency.

Signals are transmitted through short-range radio transmitters with sonar buoys that emit high-frequency digital signals. High channel capacity but poor penetration and severe signal attenuation.

Signals propagate only within the mission area and are equipped with corresponding receiving antennas, thus eliminating the possibility of external detection of signals.

300 sonar signal buoys, transmitting information every two seconds.

And this is one of the continent's shipping lanes, so the sonar buoy quickly scans multiple [mechanical sound sources] and triangulates the exact location of those sound sources by detecting the time of the sound source through the adjacent sonar buoys.

The movement trajectory of a giant ship appears on a huge electronic combat chart.

Modern sonar technology has become fully electronic and informatized.

Like in a naval movie, the audience sits in an airtight, airtight, soundproofed room, relying entirely on the sound scene with headphones. It can't be said that it's all in the past, but it certainly won't happen at a time when we haven't confirmed the approximate location of the target.

At this time, in the Operations Command Room, the voicemailers in charge of the voice-over information were drinking coffee from time to time. Yum yum yum yum yum debugging equipment.

The voice is listening to all the voices in the ocean.

Whether it's waves, whales, dolphins, fish herds, large or small human-made vessels, they make their own unique sounds in the ocean.

Here again, human-made vessels sound the most regular.

The propeller spins hitting the splash and the cylinder of a large engine hits back and forth.

These myriad voices come together and are passed from sonar to mothership without any artificial distinction. A dedicated information processor automatically matches these sound sources based on the information in the soundprint library.

Marine creatures and waves are filtered and human-made mechanical motion sounds are detailed.

Plus ~

These sonically-marked ships, once close to the interception network, are also scanned by frigates and advanced onboard radar on the destroyer.

The radar can detect the outline and speed of the ship, and civilian vessels, whether in mechanical power mode or in shape, are essentially different from military vessels.

So hundreds of kilometres of sea on both sides of Madagascar, in the hands of the warships of Operation Whaling.

……

Joint Fleet Commander Rashid, aboard a Berk-class missile destroyer in the southern waters of the town.

Although the previous meeting had estimated that the submarine from Giant Beast Industries was only 10 per cent likely to take this side. But Rashid thinks this 10% is likely to surprise him.

Radio silence does not mean that all ships disappear from the open sea.

Is it not the case that modern warfare is an information war and that losing contact with headquarters amounts to a lonely struggle?

Wireless is unavailable, and they also have satellite data chains.

Satellites in space are constantly sending data over an uncertain ocean. Instead, the warships performing radio silence can receive information passively from Headquarters via satellite receivers.

Passive reception cannot be detected.

Lassiter has received the latest port satellite photograph from Headquarters, in which the strange, dark submarine vanished.

It's noon, and in three to four days, the submarine will crash into the perimeter.

Rachet feels that there is plenty of time to take a relaxing break while these few days are rare.

After completing the duty assignment, Lassiter's front foot just stepped out of the watertight door of Command, and someone screamed, “Wait, sir. ”

Rashid moved his body back and glanced unhappily at his vocalist.

“Sir…”

The sonar rose in a twisted pinch and whispered: "Our passive voice on board detected an abnormal sound print. ”

“How unusual?” Lassiter walked forward with his face on.

It is common for sonar to detect abnormal soundprints, especially large sonar pedestals mounted below the bow of a destroyer, and the SQR-20 main passive drag sonar system attached to the stern.

If the destroyer is stationary, it can even capture unusual underwater soundprints of thousands of square kilometres.

Assuming that the voiceprint is particularly loud, it can propagate extremely far.

“Very special.” Voicekeeper's eyes only stare at the screen, "sir, we've never recorded this sound print, not even seen it. ”

“It… it makes people feel like a super-run on the sea. ”

“Are you sure? ”

“Confirm…”

Rashid stepped forward, “How far is the abnormal sound print? ”

“500 to 700 nautical miles.” While the sonar reported, the listening headphones were also delivered to Rashid.

Sonar detection distance, and detection accuracy have always been the technical contradiction between the two.

Large sounds mounted under the destroyer, and dragging sounds, can detect abnormal soundprints in very distant oceans, but it cannot locate the exact location of the sound source by soundprints, even the azimuth can only give a blur approximation.

Those sonar buoys that cast into the surrounding hundreds of kilometres of ocean space have extremely short detection distances, but have higher detection accuracy than radar.

It also has the ability to capture sound prints.

Rashid brought a listening headset.

Then he heard the abnormal sound prints filtered by the processor.

Not a professionally trained person, it is basically impossible to hear what is unusual about this sound clip that has been deliberately labeled [abnormal] by the processor.

Ordinary people listen, only "zhu zhu zhu wu" sounds like electricity.

But Rashid was professionally trained to capture abnormalities from these current-like sounds, even if the training was not long.

That was a very frequent repetitive mechanical sound.

The vocalist is right, it sounds like a super-rolling roaring engine.

But...

But if the target is a speedboat with a professional high-speed engine, it's being driven by a millionaire.

It cannot spread hundreds of nautical miles underwater.

The hull structure determines its engine power, propeller size.

The smaller the power and size, the smaller the sound source propagation naturally becomes.

Unless…

Unless the target is a giant ocean ship of 10,000 tons or more.

Isn't it a joke that a giant wheel of 10,000 tons or more floats out of the fast reciprocating sound of a super-run engine?