East China Sea.

Re-entering the familiar Chiwei Sea area, Zhou Yunhai was in a somewhat complicated mood, with a trace of expectation and excitement, and a little desire for revenge, because it was in this sea area that due to the death of a Song-class submarine, the navy suspended routine submarine patrols for a period of time.

When the 331 ship was successfully upgraded and made a big splash in the exercise, the navy restarted the process of routine patrols, and of course, in order to deal with possible conflicts, Zhou Yunhai's fleet also developed a new tactical method.

This time, along with the 331 ship, there is also a miniature submarine with you. This is a miniature remote-controlled submarine that was originally used for undersea operations to transform scientific research submersibles, it looks like a great white shark from a distance, although the size is not big, but the task it has to undertake is very heavy, this is more than ten meters long, high and wide in about 4 meters of miniature submarine, due to the simple and exquisite structure, the speed on the bottom of the sea is very fast, the maximum speed is more than 25 knots per hour, far more than Zhou Yunhai's 331 ship.

After solving the problem of discovering the enemy first, the detachment launched a big discussion on how to use the performance of the latest system to carry out retaliation, and directly used its own submarine to collide with the opponent's submarine. The success rate of a successful crash is also very questionable.

However, when the war did not break out, and the enemy could not fire first at this juncture to bear the responsibility for triggering the war, so everyone had a heated discussion for a long time, and only then did a big mate have an idea, remembering the use of this remote-controlled unmanned microsubmarine to carry out the unrestricted warfare method of collision, since the success of the Jiaolong, China's submarine operation of the use of miniature submarines has flourished, and now has formed a series of dozens of underwater mini submarine operation teams, so this tactic has sufficient ready-made resources to use.

For the submarine that is relatively fragile on the seabed, if you can consciously use this miniature submarine to collide with the opponent's submarine, it will also cause amazing destructive power, so this idea was sought after by everyone as soon as it was put forward, and after careful discussion and improvement, the detachment officially proposed this miniature scientific research submarine collision method to the superiors.

The navy quickly approved their tactical plan and asked the military to assist in the transformation of miniature submarines dedicated to submarine collisions, and even Duke was alarmed and invited to a certain naval base to work on the transformation of intelligent remote control and communication systems, and soon a number of miniature submarines were transformed and joined the navy.

In the internal test, if the enemy first discovers and then directs this special ramming submarine to attack the Kilo ship under the guidance of a modified and upgraded submarine like the 331 ship, the Kilo ship often has to be close to a distance of about one nautical mile to discover this kind of miniature submarine.

But at this distance, the Kilo can no longer get rid of the special ramming submarines that are advancing at full speed one by one, and the speed is about 5 knots faster than the Kilo ship. Therefore, this tactic has quite strong practical significance.

When everything is ready, the detachment of the 331 ship began to form a cluster of 4 submarines of the same class to patrol in the waters of the Diaoyu Islands with the cooperation of aerial drones, each submarine is followed by a modified collision submarine, once the target is found, the collision submarine will first slowly approach the opponent, and only start at full speed in the last nautical mile or so, directly chasing the critical parts of the ship that collided with the opponent.

Zhou Yunhai, who was the first to discover the Kilo ship in the exercise, was full of confidence at the moment, and he had admired the new system to the ground, and at this moment he was nervously staring at the big screen of his combat system, and kept praying in his heart that he could meet a devil's submarine, although this new tactic was not proposed by him, but once the idea was opened, the officers and men of the 331 ship put forward a lot of novel ideas around this tactic to improve the rooted tactics, such as studying what parts of the opponent are more vulnerable, What is the best effect on the collision in what direction is the best one by one The crew with good mathematical skills, and even through complex mathematical and mechanical derivation, it is concluded that in some cases, they can even directly ram and sink the opponent!

Therefore, Zhou Yunhai especially hoped that the opening of this tactic would be completed by the 331 ship.

Therefore, when he re-entered the Chiwei Sea, Zhou Yunhai was a little nervous. The 331 ship sailed at a low speed of about 5 knots, and at this speed, the navigation noise emitted by the submarine was very small, and it could make very little noise while maintaining considerable mobility, and the opponent's sonar must be detected by a short distance between the two ships.

The 331 ship, which has been modified with a new sonar system, can advance to about seven or eight nautical miles, which is a great tactical advantage for Zhou Yunhai, as long as Zhou Yunhai firmly grasps this advantage, he will be invincible.

The submarine quietly dived at a depth of more than 180 meters for about twenty hours, if there was no special discovery, Zhou Yunhai and they needed to return to the waters near the base, waiting for the drone to refill the fuel before sailing, seeing that it was about to return in vain, Zhou Yunhai couldn't help but be a little disappointed.

"It seems that the devil didn't go out today." Zhou Yunhai said to himself, stood up and stretched his waist, and moved his somewhat numb body, although he went to rest for a few hours during the long cruise, the time spent sitting in the command cabin was much higher than the time of sleeping and resting.

Just when Zhou Yunhai closed his eyes and was about to take a rest, a short alarm suddenly sounded, although it was very light and soft, for Zhou Yunhai, it was like hearing a thunderbolt and immediately rushed to the front of the command platform, and on the big screen of the combat command system, it was shown that an unknown submarine was about 8 nautical miles in front of the 331 ship!

Seeing the enemy's traces, Zhou Yunhai immediately became energetic, "Attention of all units, the enemy situation is found 8 nautical miles ahead!" Zhou Yunhai's voice passed through the on-board audio transmission system, and soon resounded in the headphones of the main persons in charge of each post, "Start the power device of the tiger shark and prepare to release the impact target!" ”

The miniature ramming submarine following behind the 331 ship was named Tiger Shark by Zhou Yunhai and them, and they usually dragged it behind the submarine to save fuel, otherwise the fuel carried by this miniature submarine could not support it for a few hours and would not be able to survive.

However, when the 331 ship was in full swing and preparing for battle, the enemy ship in front suddenly turned around and headed towards the east!