The navies of East and the United States are going to conduct joint military exercises in the near future, and of course Matsumura knows about such a big thing.

It doesn't matter if the submarines of the Royal Navy of Donghua dare to come to the territorial waters of the Great Japanese Empire, and now even the garbage submarines of the ghost animals of the United States dare to come to join in the fun, it is simply too unforgivable to take the Imperial Japanese Navy in their eyes!

Japan's Naval Intelligence Department has also recently heard that the US Navy has recently developed a Whitefish-class submarine to join the US Pacific Fleet. But except for knowing that this Whitefish-class submarine follows the U-shaped submarine hull that the current navies of all countries in the world follow, the hull material is HY80 high-strength easy-to-weld special ship steel imported from the Donghua Empire, and the visual length of the boat is close to 100 meters, nothing else is known.

Obviously, this type of Whitefish-class large submarine is likely to become the main submarine of the US Navy.

Sooner or later, there will be a war between the Great Japanese Empire and the ghost beasts of the United States, which is the common understanding of the vast majority of Japanese naval officers.

Now that he has the opportunity to understand the performance of the new submarine of the United States, as an outstanding officer of the Imperial Japanese Navy, Matsumura Kanji will never allow himself to miss such a great opportunity.

Sure enough, it didn't take long for the Yi-78 boat to receive an order from the fleet: to force the Mi submarine to flee in the direction of the No. 9 sea area, and the Yi-75, Yi-76, and Yi-77 were there to respond!

At the same time, the US Navy's "Heavy Tooth Bream," which was going all out, also received an order from the fleet: to maneuver with the Japanese submarine with all its might, and there was a response in the 157th direction.

With such a big movement of the "Heavy Tooth Bream", the passive sonar of the I-78 boat was of course discovered at the first time.

"That suspected U.S. submarine is going to run! Bearing 12! Depth 320, speed 5, and still accelerating, speed 6, distance 16! Inside the I-78 boat, sonar officer Koji Kitajima's shouting voice was obviously a little excited.

"Sure enough, I hid in the trench! The maximum depth of the U.S. submarine exceeds that of our Haida D-type, which is very important information! Matsumura Kanji clenched his right fist and swung it vigorously into the air, and said excitedly: "Adjust the battle position and chase after it!" Find it! ”

"Captain, the target is still accelerating!"

"No matter how fast it speeds, it can't escape!" Kanji Matsumura sneered with disdain at the corner of his mouth: "Continue to keep an eye on the target situation." ”

The speed of sound waves in the sea is about 1,500 meters per second, and the unidentified submarine is 16 kilometers behind the Yi-78 boat, and the Yi-78 boat turns about 11 seconds before the opposing submarine can react. The noise emitted by the opposing submarine during the voyage will reach the location of the I-78 boat in 11 seconds.

Therefore, as long as the steering radius of the Yi-78 boat is small enough and the steering speed is fast enough, it can turn part of the side side towards the target submarine and receive noise from the other side.

The "heavy tooth snapper" does not seem to have had good luck. Because its passive sonar search range is neither as far as that of XXI submarines, nor as fine as XXI submarines. The "heavy tooth snapper" has not yet figured out the direction of the enemy boat, and the other side has already locked it on.

However, neither the "Heavy Tooth Bream" nor the Yi 78 boat expected that in this deep sea area with an average water depth of more than 1,500 meters, there was a larger and more ferocious deep-sea monster hovering there on the edge of an undersea mountain at a depth of 450 meters, and used its advanced passive sonar and radar to encircle the "Heavy Tooth Bream" and the Yi 78 boat.

In the SSN-412 "Expedition 039" Seawolf-class attack nuclear submarine, Zhou Haisheng couldn't help but praise the Japanese submarine Yi 78's sudden beautiful and neat turn in place.

The little devil has mastered the passive sonar and active sonar of the XXI submarine quite finely.

If the American submarine had been more patient, they would have had every chance to enter the blind spot of the I-78's sonar and then use its depth advantage to get under the belly of the I-78.

It's a pity, I don't know what the reason is, the captain of this American submarine is so breathless.

You must know that this is the bottom of the sea at a depth of 240 meters, and if anything happens here, the fleet on the surface will not be able to grasp the first-hand information in time.

If anyone can see through the surface of this sea area, they can see that the Japanese submarine I-78 is turning in waters at a depth of 240 meters, the American submarine "Heavy Tooth Bream" is floating at full speed in the 310-meter water area 16 kilometers southwest of I-78, and the Seawolf-class attack nuclear submarine SSN-412 "Expeditionary 039" of the Royal Donghua Navy as a yellow finch is in the waters 450 meters deep between the I-78 boat and the "Heavy Tooth Bream".

It takes at least five minutes for the "Heavy Tooth Bream" to accelerate from a standstill to a maximum speed of 9 knots. This gave the I-78 plenty of time to pounce on it after adjusting to its favorable position.

What exactly did this captain of an American submarine want to do? Zhou Haisheng's heart was full of questions.

"Captain, the American submarine has risen to 280 meters. The distance from the Japanese submarine in a straight line is 7800 meters. Peng Haitao, the navigator of the SSN-412 "Expedition 039" Seawolf-class attack nuclear submarine, reminded Zhou Haisheng with a playful smile on his face.

"As soon as the Japanese submarine sends out an active sonar, immediately release the signal of a simulated torpedo attack!" Zhou Haisheng didn't think much about it and made a decision immediately.

After about two minutes, the I-78 turned and the Nibellongen active sonar in the bow began to work, sending a high-energy infrasonic wave in the direction of the target submarine that vaporized the surrounding seawater.

At the same time, on the display of the sonar console of the USS Heavy Tooth Bream, the curve of the noise signal suddenly jumped, forming a very obvious crest.

Submarine staff officer Crow lost his voice and exclaimed: "Low-frequency active sonar, energy intensity C!" It's a Japanese submarine, and we're in the side lobes of the sound waves. ”

Before Crowle's voice could finish speaking, the hull of the "Heavy Tooth Snapper" shook violently.

"Prepare for battle! Enter the attack parameters for the torpedo! Jacob stood up and said calmly: "Heading 187, advance eight, keep diving!" ”

Heading 187? Rushing towards a Japanese submarine? Crowle's mind was a little messed up.

"Captain, I noticed the sound of the torpedo tube filling water!" The sonar soldier suddenly shouted loudly: "The other party has opened the front cover of the torpedo tube, and the torpedo has been launched with a high-frequency howl!" ”

The same situation also happened in the Japanese Navy's I-78 submarine, Koji Kitajima jumped up and shouted at Matsumura Kanji as if he was alive: "Captain, I found the noise of the torpedo tube filling water, the target has opened the front cover of the torpedo tube, and the high-frequency howl!" They are firing torpedoes! ”

"Fight back! Two torpedo shots! Kanji Matsumura did not hesitate to order a return fire.

In the US Navy submarine "Heavy Tooth Bream", which was about 7,500 meters away, Jacob also gritted his teeth and said: "Torpedo launch!" Four shots! ”

In the deep sea waters with a water depth of 450 meters, the hovering Donghua Royal SSN-412 "Expedition 039" Seawolf-class attack nuclear submarine, in the command cabin, Zhou Haisheng is also giving instructions: "The thruster is started, the course is 321, advance 12, and keep the depth!" ”

"Torpedo two, speed 35...... 40…… 45…… 50…… 55, reach maximum speed, travel at high speed! ”

"Torpedo four, speed 30...... 35…… 40…… 45…… 50…… 55 to reach maximum speed! ”

In front of the sonar display console, Peng Haitao reported the details of the torpedoes fired by the US submarine and the Japanese submarine in one breath, and then turned back to look at the captain Zhou Haisheng.

In the command cabin of the SSN-412 "Expeditionary 039" Seawolf-class attack nuclear submarine, all the officers and men looked towards the captain.

Zhou Haisheng thought for a moment and said: "Left full rudder, fast forward 15, full speed forward, first 15, tail 15, depth 240, ready to launch torpedoes!" ”

(To be continued.) )