When everything was ready, the detachment of the 331 ship was located to form a cluster of four submarines of the same class, and cruised in the Diaodao waters with the cooperation of aerial drones. Each submarine was followed by a modified collision submarine. Once the target was discovered, the collision submarine would slowly approach the opponent and start at full speed in the last mile or so, directly chasing the key parts of the ship that collided with the opponent.

Zhou Yunhai, who was the first to discover the Kiro ship during the exercise, was full of confidence at the moment and admired the new system. 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 Japanese submarine. Although this new tactic was not proposed by him, once the idea was opened, the officers and soldiers of the 331 ship were put forward many novel ideas to improve rooting tactics around this tactic, such as studying which part of the opponent is fragile and which direction is the best to impact. One is a crew member with good mathematical skills, and even through complex mathematical and mechanic deduction, it was concluded that in some cases, the opponent could even be directly sunk!

Therefore, Zhou Yunhai particularly hopes that the opening work of this tactic will be completed by the 331 ship.

Therefore, after re-entering the Chiwei Sea, Zhou Yunhai became a little nervous. The 331 ship sailed at a low speed of about 5 knots. At this speed, the submarine made very little navigation noise and could make very little noise while maintaining a considerable maneuver power. If the opponent's sonar is to be discovered, the two ships must be very short apart. According to the experience of the Kiro, it must be at least about 5 nautical miles to be discovered.

The 331 ship modified with the new sonar system can reach about seven or eight nautical miles in advance. For Zhou Yunhai, this is a great tactical advantage. As long as Zhou Yunhai firmly grasps this advantage, he will be invincible.

The submarine quietly snorted at a depth of more than 180 meters for about twenty hours. If there was no special discovery, Zhou Yunhai and the others would need to return to the waters near the base and wait for the drone to fill up again before sailing. Seeing that they were about to return empty-handed, Zhou Yunhai couldn't help but feel a little disappointed.

"It seems that the Japanese didn't go out today." Zhou Yunhai said to himself, standing up and stretching his waist, moving his slightly numb body. Although he had been resting for a few hours during a long cruise, the time he sat in the command cabin was far higher than the time he had to sleep and rest.

Just as Zhou Yunhai closed his eyes and was about to rest, a short sirens suddenly sounded. Although it was very light and soft, Zhou Yunhai immediately rushed to the front of the command platform as if he heard a thunderbolt. On the large screen of the combat command system, an unknown submarine was about 8 nautical miles in front of the 331 ship!

Seeing the enemy appear, Zhou Yunhai immediately became energetic, "All units should pay attention to the enemy situation, and the enemy situation was discovered 8 nautical miles ahead!" Zhou Yunhai's voice quickly resounded through the sound transmission system on the boat and the headphones of the main person in charge of each position. "Activate the tiger shark's power device and prepare to release the impact target!"

The miniature collision submarine following the 331 ship was named Tiger Shark by Zhou Yunhai and others. They usually dragged behind the submarine to save fuel. Otherwise, the fuel carried by this micro submarine would not be able to withstand it in less than a few hours.

However, while the 331 ship was preparing for the battle, the enemy ship in front suddenly turned and headed east!
Chapter completed!