Two of the other four helicopters are also preparing to participate in the operation to increase the confidence of success.

These four helicopters were originally produced in two batches, and two were produced in each batch. The first batch of aircraft failed during the last military exercise. After inspection, it was found that the cracks in the rotor twisted part were caused by the long-term excessive torque between the two joint components. This is a design defect. In order to ensure absolute safety, the design of the local structure must be improved and the structural components can only be continued to be used. The design of the two helicopters in the second batch of rotor twisted has been slightly improved, so no damage caused by excessive torque has been found. It can be continued to be used at present. The two aircraft used this time are the second batch of aircraft.

In Taizhou area in southern Zhejiang, on the sea surface a hundred kilometers east of Wenling, a scorching sun like a fire hangs in the sky. The scorching sunlight reflects on the blue waves that rise one after another, reflecting dazzling cloud spots. The two complement each other, forming a large number of gorgeous star spots.

Between several shining and beating spots, an air conduit, like a floating object on the sea, was quietly suspending above the sea. This was the ventilator raised from the surface of the No. 10 Tang-class diesel-electric submarine. Another No. 20 submarine lurked under the sea not far away, and its diesel engine was also working.

Diesel-electric submarines rely on diesel engines to charge the battery to obtain electricity. The submarine uses motors to provide kinetic energy when stealthing at the bottom of the water. At this time, the diesel engines of the two submarines are working at high loads, slowly converting mechanical kinetic energy into electrical energy and storing it into the battery. This is the last charge before departure.

In this era, submarines from other countries have not designed such snorkels that can lift out of the water. Therefore, every time the diesel engine is started to charge, it must surface, which increases the risk of exposure to the target. Moreover, the tonnage of submarines designed by various countries is mostly between several hundred tons, which is several times worse than the displacement of the two Tang-class 2,000 tons, and the number of torpedo tubes and torpedoes is also several times different.

Moreover, the Tang-class submarine is equipped with active and passive sonar, which can search for targets more than ten nautical miles away. Other submarines are not equipped with sonar yet. However, the torpedoes used by the Tang-class submarine are still old-fashioned direct flight torpedoes, rather than later line-guided and wake-guided torpedoes.

The characteristic of direct torpedoes is that they will not turn and can only move forward in the direction of the original launch. Line-guided torpedoes have guidance capabilities and can track the target to achieve curve maneuvering. Therefore, line-guided torpedoes can be launched at a relatively long distance, and there is no need to worry about the target moving away from the launch direction. The time, distance and direction of direct torpedoes are required to be relatively skilled in cooperation and operation, so the possibility of hitting the target will be greatly increased.

When submarines in this era fight against underwater submarines, they usually launch torpedoes when they can observe the opponent through a periscope. Moreover, the submarine has torpedo tubes at the head and tail, which can be fired forward and rearward. Tang-class submarines still retain this feature, retaining two torpedo tubes at the tail, and six torpedo tubes at the head, equipped with a total of twenty-four torpedo tubes.

At this time, radio communications have been widely spread around the world, and communication methods such as radio generators have begun to be connected to each other. However, communication between submarines and their own ships has always been a difficult point. Because electromagnetic waves decay in water very quickly, submarine communications must be carried out nearer to the water surface; more advanced submarines in later generations are equipped with towed antennas and can also lurk deeper seas for communication, but submarine communications are more difficult than surface ships and aircraft. If they do not surface, the communication distance will be greatly limited.

Radio communication facilities are also used between the two Tang-class submarines to communicate and transmit information in a timely manner. After the two submarines have been charged one after another, they begin to dive deeper waters and slowly sneak towards the southeast direction.

The submarine 010 was commanded by the captain Hao Xuanwei, and the captain Guo Zhenshan led the captain Guo. Then, the two submarines began to search the southeastern waters of Zhejiang based on the information they had obtained before. There were four civilian ships accompanying them on the water. These four civilian ships were only temporarily requisitioned. Two were cargo ships below two thousand tons, and two other cargo ships reached more than four thousand tons. Their decks were relatively wide. A helicopter was parked on each deck and covered with canvas. From the outside, it looked like a shipped cargo. The four cargo ships were temporarily equipped with military communication equipment to maintain the connection with the underwater submarine. In addition, communication equipment was also installed on the helicopters.

For the sake of concealment, none of the four cargo ships hang the national flag, and the conspicuous parts of the string were deliberately covered in order to prevent them from being observed during the execution of the mission, leaving behind evidence that can be traced.

In the submarine No. 010, Hao Xuanwei was sitting around the dining table with Dafu, weapons, sonars and more than a dozen people, eating a delicious breakfast. The breakfast included eggs, sausages, cabbage, milk and other varieties, which were rich and balanced, and were filled with the sound of crew members chewing happily and collide with basins, dishes and chopsticks on the table. Everything looked very quiet and peaceful, unlike the thrilling sea battle that was about to take place.

According to information, the Japanese freighter Juye, which was transporting gold by the Japanese, had already passed through the Taiwan Strait and appeared on the East China Sea. It was only a two-hour flight away from the eastern sea area of ​​Taizhou. Taking advantage of this time, Hao Xuanwei explained some precautions to the crew, as well as possible emergencies in this plan, and their response measures. The crew had long been familiar with the detailed implementation steps of this plan and measures to deal with all possible emergencies.

This time, there were two Japanese warships escorted, both old-fashioned cruisers, one of which was the Takachiho and the other Langsu. Both cruisers had participated in the Sino-Japanese Navy's Sino-Japanese Navy and were used by the Japanese Navy as backward second-class coastal defense ships. The escort mission to protect civilian ships was also handed over to these two warships this time.

Both warships are over fifteen years old, with a displacement of about 4,000 tons. The firepower is roughly 260mm35 times the caliber Krupp main guns, 6 150mm35 times the caliber Krupp guns, 10 25mm quadrupp guns, 4 11mm10-tube Green guns, and 4 360mm torpedo launch tubes.

These weapons and equipment can only pose a threat to submarines, but these two warships obviously do not have sonar equipment for detecting submarines, so submarines are basically equivalent to stealth ships for them. Without the cooperation of underwater submarines, these two warships will not have any threat to the two Tang-class submarines, so the expressions on the crew did not show an overly nervous look, and most of them appear plain and natural.

The crew of the submarine is in a three-shift system, and the work and rest time is eighteen hours. Each six hours changes one shift on duty, one rest, one shift entertainment, one shift on duty, the captain and the rich, the weapons and other officers also take turns to rest. They work longer than ordinary crew members, and the entertainment time is basically on duty. When they encounter combat missions, the captain is usually commanded by the captain himself.

Both submarines had already sneaked into the depths of the East China Sea at this time, and this area was a necessary passage for Japanese cargo ships. Four civilian ships were scattered in the surrounding waters, closely following passing ships.

At around ten o'clock, a civilian ship finally discovered the Yokohama cargo ship slowly heading towards the northeast. It was a 10,000-ton ordinary cargo ship. In addition to gold, the Yokohama also loaded a batch of rubber products back to Japan, which was also used as a cover for transporting gold. There were two or three waves of pirates along the way, but they were all scared away by the Japanese Takachiho and the Nasuo.

The Takachiho and the Nasuo protected the Yokohama through the East China Sea, and the huge chimney entrances on the ship were rolling out, and there were several loud whistles coming from the sea from time to time.

The crew on the southernmost civilian ship was using a telescope to observe the situation on the southeastern sea. They had captured the shadow of the Takachiho, and then deliberately distanced the distance to avoid attracting the other party's suspicion.

"Please note of all units, pay attention to all units, I am a hedgehog. I have found traces of three mice. They are heading towards me. The big mouse (referring to a cargo ship) is sandwiched between two small mice. It is only about 18 nautical miles away from me, and is located in the direction of 67 degrees. Please be prepared!" A radio signal was soon transmitted from this civilian ship, and several other civilian ships and submarines immediately received the information.

After receiving the signal, the four civilian ships began to spread towards the surrounding waters. Their mission was to track the Yokohama cargo ship on both sides and keep a certain distance from them. Once the submarine succeeded, it rushed up to surround the cargo ship, threatened it to stop moving forward, and then sent people to board the ship to transport cargo. The whole process still needs to be seized. If the time was delayed for too long, it would lead to the Japanese fleet stationed in Taiwan to come and rescue.

"Everyone is here and prepare for the battle!" After receiving the wired call from the messenger, Hao Xuanwei immediately issued an order through the radio installed on the submarine.

All crew members immediately stopped all activities and began to concentrate on their respective posts. The submarine suddenly heard the sound of rapid footsteps, the shouts of reminding the crew, and the operation commands. Then all the instruments and other equipment related to the battle were activated. At this time, the eight torpedo launch tubes had been filled with torpedoes, waiting to launch the tubes.

The submarine No. 20 was also ready for combat at the same time, and began to line up parallel to the No. 10 and gradually moved closer to the target position. Soon after, the active sonar of the two submarines searched for the water noises and noises made by the Yokohama and Takachiho and the Langsu.

"Control the horizontal rudder, float fifty meters up, observe them close to the sea." Hao Xuanwei's expression seemed a little excited, and his hands gradually clenched into fists. This was the first time he had performed a practical task since he was the captain. Moreover, the other party was a ship that had participated in the invasion of China. A strong sense of hatred arose in his heart, and a fierce look shining in his eyes and ordered loudly.
Chapter completed!