.The US anti-submarine patrol aircraft did make a mistake and missed the best opportunity to sink the Shark in one fell swoop.

After receiving the call for help from the North Carolina using a communication buoy, three P-3cs dropped the third batch of sonar buoy about 75 nautical miles east of the Troy Sea Peak. Although the P-3c is affiliated with the strategic anti-submarine force of the Navy Aviation Force and is directly commanded by the African Theater Command and does not obey the Roosevelt combat group, the US military has a very complete command system. The African Theater Command quickly intervened and asked the three P-3cs to give up searching and go to the waters where the North Carolina is located.

Twenty-five minutes later, three P-3cs arrived at the waters near the Troy Sea Peak.

At this time, the US military did not know that the North Carolina had exchanged fire with the Shark and was sunk by two heavy torpedoes fired by themselves.

Because there is no contact with the North Carolina, after P-3c arrives, you must first figure out the situation under the sea.

After dropping the first batch of passive sonar buoys, no suspicious targets were found in p-3c.

Where did the North Carolina go?

In just twenty-five minutes, the North Carolina can sail up to 14 nautical miles, and it will produce very loud noise when sailing at a speed of thirty-four knots.

There was no abnormal sound under the sea.

It is enough to prove that the North Carolina is nearby, and the "unidentified" submarine mentioned in the telegram for assistance is also nearby. Both submarines sail at very low speeds, even suspended in the sea at rest, and the noise emitted is outside the detection range of the passive sonar buoy.

According to the US military's anti-submarine tactics, the anti-submarine patrol aircraft will use active sonar buoys to help the North Carolina drive out the enemy boat.

p-3c strictly abides by this tactic.

One p-3c climbed to a height of 1,500 meters and acted as a long aircraft for the anti-submarine formation. One p-3c dropped an active sonar buoy at an altitude of 150 meters, and the other p-3c was on standby behind the formation, preparing to launch an attack with an aviation anti-submarine torpedo.

Without much effort, the active sonar buoy discovered a suspicious target that was sailing north.

Because the performance of the active sonar buoy is far inferior to that of the submarine's attack sonar and it is impossible to identify the submarine, before launching the attack, the long aircraft remotely controlled the active sonar buoy and sent a set of high-frequency sound waves containing the identity identification code to the suspicious submarine.

If that submarine is the North Carolina, it will send a response signal with a high-frequency sonar.

Unfortunately, the "Shark" does not have the US military's identity identification device, and does not find the identification signal in high-frequency sound waves, making it even more impossible to respond.

By this time, the anti-submarine patrol aircraft should launch an attack.

The problem is that sound waves are not electromagnetic waves. The potential enemy-to-me recognition system using sound waves as information carriers will definitely not be comparable to the enemy-to-me recognition system on fighter jets. It not only carries less information, has a closer transmission distance, is more susceptible to interference, and often fails.

If the high-frequency sonar on the North Carolina fails, or the inquiry signal from the active sonar buoy is not recognized, it will naturally be impossible to respond.

what to do?

During this period, the US Submarine Command was also sending messages to the North Carolina using ultra-long-wave radio, hoping to contact the submarine.

The efforts have not gained anything, and the North Carolina has been like a rock sinking into the sea without any response.

After repeated concerns, the US African Theater Command issued an order to the anti-submarine patrol aircraft to throw torpedoes and attack the submarine that was sailing north.

It was only in this order that the US rear commander required the anti-submarine patrol aircraft to sink the target after fully confirming its identity.

What is this requirement?

Is there any way not to sink a submarine?

When implementing the operation, the anti-submarine patrol aircraft can only try to keep the torpedo deployed as far as possible and only release one torpedo.

If a torpedo is dropped above the target and multiple torpedoes are dropped, regardless of whether it is the North Carolina or not, it will be sunk by the torpedo.

At a sufficiently large distance, the North Carolina will certainly avoid torpedoes.

If the submarine is indeed the North Carolina, it will take the initiative to float or launch a communication float after being attacked by torpedoes.

The actual situation is indeed the case. Shortly after the torpedo entered the water, the submarine accelerated rapidly and floated up urgently.

That submarine is really the North Carolina?

The three P-3cs did not drop torpedoes again, but instead hovered over the patrol area, waiting for the North Carolina to launch the communication buoy.

What they waited for was not the message sent by the North Carolina, but the sudden change of momentum.

After the Shark floated to a depth of 150 meters, it corrected its navigation attitude and sailed northward for about one nautical mile at a speed of 35 knots. After the tracked mk46 reached the same depth, it penetrated into the deep sea and passed through the temperature jump between 250 meters and 350 meters at the fastest speed.

Although mk46 dives in an emergency, it loses its target when passing through the temperature jump.

After reaching a depth of 400 meters, the torpedo restarted the search program and searched for the attack target along the spiral route. When the torpedo discovered again that the "Shark" was still sailing north, the distance had been widened to more than two nautical miles, while the remaining range of the torpedo was less than three nautical miles.

With a relative speed of twenty knots, it is impossible for torpedoes to catch up to submarines with a speed of up to thirty-five knots within three nautical miles.

At the end of the route, the self-destruct device on mk46 was activated, detonating the battle thunder head.

The explosion interfered with the passive sonar of the Shark and also interfered with the sonar buoy dropped by the anti-submarine patrol aircraft.

Because the Shark adopted the necessary evasion tactics, even if it was replaced by the North Carolina, the same tactics would be adopted. So until this time, the US military officers and soldiers on the anti-submarine patrol plane were still unable to confirm whether the attack was the North Carolina.

Only when the submarine floats on the surface or releases a sonar buoy can its identity be determined.

After waiting for about two minutes, the interference signal generated by the torpedo explosion disappeared. The active sonar buoy once again detected a suspicious submarine that was still sailing north at a speed of 35 knots. There was no communication buoy on the sea surface, and the radio station did not receive the signal from the North Carolina. The US military officers and soldiers on the anti-submarine patrol aircraft began to suspect that the submarine was not the North Carolina.

The problem is that no one can be sure of this guess.

The US military officers and soldiers on the anti-submarine patrol plane had no idea about the situation under the sea. Maybe the "unidentified" submarine had left this sea area and was sailing northward. The "North Carolina" followed him. After reinforcements arrived, they began to accelerate their pursuit. In order to catch up with the "unidentified" submarine, the "North Carolina" did not float to the surface.

As for why the communication buoy is not delivered, there may be other reasons.

If the USS North Carolina accidentally hits, even if it is injured, the officers and soldiers on the anti-submarine patrol plane will be sent to military court.

No one can afford this responsibility.

To be on the safe side, the captain ordered the P-3c that was previously responsible for searching to accelerate to the waters north of the Troy Sea peak. The P-3c, responsible for attack, continued to track the suspicious submarines, and immediately reported the relevant situation to the African War Zone Command for the next step of instructions.

At this time, the US African Theater Command was also making every effort to analyze the battlefield situation.

The North Carolina remained silent, causing great trouble to the tactical decision-making of the US military commander.

When the P-3C aircraft issued a consultation, the US military was fully analyzing the collected battlefield information.

At this time, a noise information that was previously ignored by p-3c attracted the attention of the US military commander. Before p-3c arrived at the waters near the Troy seabed peak, the passive sonar buoy dropped earlier intercepted a noise signal. Because the signal strength was too weak, it was automatically filtered out by the computer. After using the headquarters' large computer and removing the background noise, the US military analyst immediately heard it. It was not ocean noise, but explosion sounds, and two explosions. According to the degree of noise attenuation, the approximate location of the explosion can be calculated.

Just south of the Troy Undersea Peak, not far from where the suspicious submarine appeared!

Now, the situation is completely clear.

If the "unidentified" submarine sank in the explosion before, and the suspicious submarine is the "North Carolina", there is no reason to continue to stay under the sea after the anti-submarine patrol aircraft arrives, and there is no reason not to float in Shanghai after being attacked by torpedoes.

Because the North Carolina clearly mentioned in the telegram asking for help that it encountered one enemy boat, not two, the one that was escaping must be an "unidentified" submarine.

To draw this conclusion, the US military commander immediately issued an order to the anti-submarine patrol aircraft: to sink a suspicious submarine.

The meaning of this order is very clear, it is to "sink" rather than force it to float on the sea.

To be on the safe side, the captain sent another inquiry and asked the African War Zone Command to confirm the order issued.

At this time, the Shark was about one nautical mile from the southern slope of the Troy Undersea Peak.

The situation is not ideal, because a P-3c has already caught up, and there are three MK46 anti-submarine torpedoes on this P-3c.

According to the attack procedure, p-3c first casts an active sonar buoy.

After locking the target again, p-3c dropped three mk46 anti-submarine torpedoes in turn at a height of 150 meters.

The sound of torpedoes entering the water is very clear, and the "Shark" is more than a thousand meters away from the Troy underwater peak ahead.

Although it only takes less than two minutes for submarines with a speed of up to 35 knots to reach the Troy peak, then rely on the interference of the mountain to the sonar echo and the complex submarine terrain to avoid torpedoes, the torpedo dropped on the submarine's head can catch up with the submarine in a shorter time.

In the "Shark", Zhou Yusheng has already finished his talent.

He tried his best, and the US commander hesitated to give Shark a lot of time to the mistakes made by the US anti-submarine patrol plane, but in the end he was unable to escape the torpedo attack range.

Did you accept your fate like that?

Zhou Yusheng couldn't think of a way to escape, and silence was his choice.
Chapter completed!