Chapter 493 Crazy Ivan

As an advanced Soviet nuclear submarine, the Type 949 nuclear submarine is equipped with very advanced equipment. In the underwater world where everything depends entirely on hearing, the Type 949 is also fully equipped. It has a total of four types of sonars, including "shark gill" type active/passive medium and low frequency search and attack hull sonar, "shark rib" type passive low frequency side array sonar, "rat cry" type active high frequency attack hull sonar, and "pyramid" type passive very low frequency towed linear array sonar.

These sonars can provide a full view of the front and sides, but like all submarines, the 949-class cannot detect conditions directly behind itself. Even if the sonar is deployed there, the noise made by the propeller at the tail stirring the sea water will prevent the 949-class from receiving any sound from directly behind it, and it will only be noise.

This is a congenital defect of submarines that cannot be overcome, so during the peak of the Cold War, Soviet submarines would adopt a common tactic. The Americans called this tactic "Stupid Yankee", and another name for it is "Crazy Ivan!"

Since the submarine's bow sonar and side sonar cannot detect the sound source at its tail, in order to be able to hear the sound at the tail, it can only take a simple approach: turn!

If it is an early submarine with only a bow sonar, the turn will be 180 degrees. The sharp turn will make it impossible for the tracker behind to react. The 180-degree turn may also cause the tracker behind to rush to the front and become the prey. You must know that most of the early torpedoes were tail-chasing and tracking. Whoever occupies the tail-biting position will win.

Now, after being equipped with the broadside sonar, the submarine only needs to turn 90 degrees, and then it can use the broadside sonar to aim at the original rear for observation! In order to prevent the rear from reacting, this turn must be quick, so a sharp turn at full speed is the most correct choice!

The reason why this action is crazy is that it would be fine if there is no submarine tracking behind. If there is, it is easy to collide underwater. There is a precedent for this. Ten years ago, the US SSN-639 "Wrasse" nuclear submarine collided with the Soviet Echo 2 nuclear submarine. Fortunately, no casualties were caused on both sides.

Afterwards, the American submarines continued to track the Soviet submarines, and the Soviet submarines continued to use Crazy Ivan's tactics. This was the mission of both sides.

In reality, although we have towed-body sonar, it is very dangerous to carry such a thing at the tail when sailing at full speed. Towed-body sonar is only used to detect targets when cruising.

The Type 949 submarine, sailing at full speed, would turn almost every hour to check the situation behind it.

You know, the noise caused by full-speed sailing makes it impossible for the 949 class to hide its whereabouts. Although there is the effect of density jump layer, Nirgeyev is also a cautious person.

"Full left rudder." Nirgayev gave the order.

"Understood. Full left rudder." The helmsman operated the engine and turned it twice.

The rudder at the tail turned, and the submarine, traveling at a high speed of 30 knots, with its 16,000-ton hull, turned sideways, stirring up a large amount of water and making new sounds.

The left side sonar had been turned on long ago, and as the ship turned, the side was aimed at the rear.

The sonar operator had been listening intently, and at that moment he heard a familiar submarine.

"Los Angeles class! Range one! Depth one hundred and fifty! Speed ​​thirty-three!" the sonar operator shouted.

Damn the Americans! Hearing this, Nilgayev, who had always been calm, was also stunned. Then, he shouted: "Quick, drain the bow and float up urgently!"

The underwater world is three-dimensional. In addition to fighting on the horizontal plane, you can also go up and down! Nirgeyev's emergency surfacing does not mean floating out of the sea, but just floating up a few dozen meters. Both sides can avoid each other!

If both parties have a tacit understanding, one will float up and the other will dive down, then they can avoid the attack instantly!

However, Nilgaiev guessed wrong.

"Quick, drain the bow and surface urgently! Reverse the propeller and go in reverse at full speed!" After hearing the sonar operator's report that the other party had come up with a crazy Ivan at this moment, Collison was immediately shocked. Then, he gave his own order to surface!

The captains all chose to surface urgently. There is a reason for this. After all, for a submarine, there is a threat of death at any time. No one wants to sink to the bottom of the water, so surfacing is the first choice!

The seawater at the bow was discharged, and the bow suddenly became lighter. The huge hull began to tilt upward. At the same time, the propeller at the tail began to reverse with a huge sound of gears meshing.

If you want to reverse in the water, you have to reverse the propeller, but due to inertia, the submarine is still moving forward!

Hopefully, they can get away with it! Collison almost crossed himself.

"Boom!" At this moment, a huge noise spread throughout the submarine.

If you could observe from the outside at this time, you would see that the two submarines, which were preparing to surface at full speed, had close contact while sailing upward at an angle!

The 949-class nuclear submarine has a large and bulky hull, and its mass is almost twice that of the Los Angeles-class, so its underwater maneuverability is not strong. However, it was the first to discover the situation and drain the seawater from the bow, and it did not slow down, so it was on par with the Los Angeles-class submarine that followed.

If the Los Angeles class had not slowed down, it would have directly collided with the front half of the 949 class. The deceleration did play a certain role, allowing its bow to pass by the front of the 949 class. However, it still could not escape the bad luck. The hull of the Los Angeles class's conning tower collided with the lower rear of the 949 class!

If they collided at the front, both sides would sink. Although the 949-class double-hull submarine has good anti-sinking performance, the non-pressure hull at the front is filled with P700 missiles! Once such missiles are ignited under collision, the consequence is almost a shocking underwater explosion.

Now, Los Angeles hit the rear of 949, and the conning tower's hull collided with the belly of the 949-class tail. As a result, Oscar's huge hull moved two meters sideways! After the Los Angeles-class conning tower hit the 949-class hull, it knocked a big hole in the outer non-pressure hull and got stuck on it!

The surging sea water poured in through the cracked command tower in Los Angeles.

"Conduct damage control inspection!" On the 949-class nuclear submarine, Nirgeyev was also giving orders. The collision just now had happened, and it was not his business what happened to the Americans. He needed to protect his own submarine. The collision just now was extremely violent. What happened to his submarine?