In the early morning of July 10, 2025, on the treacherous Atlantic Sea, the night sky has revealed the white of the fish's belly, sprinkled on the rough sea, glowing brightly.

400 meters below the ocean, a huge submarine is quietly sneaking into the dark deep sea. This is a Type 096 attack nuclear submarine of the Chinese Navy, which is on a routine combat readiness patrol mission.

It is located 300 nautical miles west of Bermuda and just over 200 nautical miles from the east coast of the United States.

"Report, Haiji ordered." The confidential officer handed a copy of the order of the Navy Command to the captain of the ship, Colonel Du Haiwei, who was on duty on the command platform.

Du Haiwei was dressed in a combat uniform, in his early forties, with thick eyebrows and big eyes, and his stature was not tall and very strong. He took the order, glanced at it quickly, and it said: Continue to approach the east coast of the United States, look for a suitable opportunity, expose our boat, and let them know that we are coming.

"Reply to Hai Si, the 805 boat understands and resolutely executes the order." Captain Du said to the confidential officer. Then he gave the chief engineer an order: "Heading due west, speed 30 knots." ”

Du Haiwei knows that since the Taiwan Democratic League came to power, relying on the support of the Americans, the farce of independence has been rampant, and they are different from the previous governments, but they are just making trouble, but this time they have stepped up the pace of independence, started substantive actions, and they have already drawn up a timetable for a referendum.

Hai Si's order is very clear, that is, to show the United States our muscles, so that the United States, the backstage boss, understands that your meddling in Taiwan affairs will undoubtedly set yourself on fire, and China is no longer the China of the past.

Two hours had passed, and the 805 boat was already less than one hundred and fifty nautical miles from the east coast of the United States.

Captain Du could not hide his excitement, although China's nuclear submarines have achieved global combat readiness duty, but he is the first Chinese submarine captain to come to the coast of the United States.

Suddenly, the submarine fell to the bottom of the sea several thousand meters as if it had lost its buoyancy......

"Not good, cliff". A danger signal flashed in Captain Du's head, and he subconsciously sounded the alarm.

The so-called "cliff" is a state in which the density of the upper layer of the seawater thermocline is high and the density of the lower layer is small, forming a negative density gradient jump, and the buoyancy of the seawater decreases sharply from top to bottom, which is called the "sea cliff".

The effective depth of most conventional submarines is 300 meters, and when the submarine falls below the safe diving depth uncontrollably, it will be destroyed by the huge seawater pressure, and the submarine that loses its buoyancy will quickly fall to the bottom of the sea at a depth of several thousand meters. "Falling into depth" is one of the most dangerous conditions in underwater navigation of submarines, and "falling into depth" to the extreme depth of the submarine will destroy the submarine and kill people.

At this time, the 805 boat had already fallen rapidly into the depths of the ocean, 500 meters, 600 meters, 700 meters...... The lights in the boat were suddenly extinguished, and the pipes in the main motor room were broken by the intense pressure of the deep sea, and seawater gushed in.

"Woo ......" was accompanied by the sound of a sharp alarm, and at the critical moment, the officers and men of the whole boat began to deal with the emergency in a reflex way. Within three minutes, they closed nearly 100 valves and switches and operated dozens of instruments in a water mist environment with almost zero visibility......

At the same time, Zhu Hailiang, a young engineer soldier, was the first to rush into the main motor room, and when he saw the gushing seawater, he rushed in without thinking about anything and blocked the broken mouth with his body.

In three minutes, it took them only three minutes to finally rule out the danger. The 805 boat regained power.

The ability to turn danger into relief comes from the excellent skills that are usually practiced. Captain Du couldn't help but sigh in his heart!

"Float." Captain Du gave the order to float.

Du Haiwei knew that it was extremely dangerous to surface so close to the east coast of the United States, but he had to do so, because he had to carry out a comprehensive inspection and maintenance of the submarine, first, to ensure the safety of the submarine, and second, to ensure the submarine's attack capability.

The sky had already dawned, and a big black creature suddenly appeared on the gray sea, which was very conspicuous.

"Report to the captain, spotting a plane coming towards us." The radar soldier reported.

"Captain, let's dive." The chief engineer also asked.

"Nope. We do what we have to do, ignore it. Du Haiwei shook his head, a smile on the corner of his mouth, he knew that the opportunity to show his muscles had come.

"Tom, a ship has appeared in front of us on the left."

"Bill, let's go take a look."

At the same time, a U.S. Coast Guard reconnaissance plane was also on a routine patrol mission, and they also spotted the 805 boat. The two pilots of the plane saw a black dot in the vast sea.

"Bill, you see, it's a submarine."

"Oh, that's normal, what the hell are they doing, what are they doing there?"

"It doesn't seem to be our submarine, I'll check." Tom called the base uneasily.

"Impossible, we don't have submarines there at this time period". The base was quick to give an answer.

"You fly over and see where it is? Report the specific directions. "At the same time, the base gave them orders.

The reconnaissance plane circled around the 805 boat.

Du Haiwei looked at the US Coast Guard plane with a fascinated eye, and he knew very well that it would soon summon the anti-submarine plane.

So, he gave the order to dive.

In the monstrous waves, the huge 805 boat drowned in the ocean. Sure enough, twenty minutes later, a P-8A Poseidon anti-submarine patrol plane that took off urgently from the continental United States flew to the surface of the sea.

The P-8A Poseidon anti-submarine patrol aircraft dropped a series of sonar detectors, not even the shadow of a submarine, and it flew around the sea area repeatedly, still not finding anything.

Half an hour later, the P-8A Poseidon anti-submarine patrol aircraft, which had nothing to gain, flew away disappointed.

In fact, the 805 boat did not leave this sea area at all, it still quietly lurked 500 meters underwater.

It's just that Du Haiwei used the hidden effect of the seawater cline on underwater submarines.

It turns out that the sonar signal emitted above the cline is not easy to detect targets below the cline, and the possibility of submarines diving below the cline is greatly reduced.

If the seawater thermocline is less intense, the upper depth is deeper, the thickness is larger, and the stability is more durable, irregular acoustic reflections will be formed, which will greatly reduce the combat effectiveness of anti-submarine sonar and cause difficulties for anti-submarine operations. In battle, the sea water cline is more suitable for submarine covert action, and the submarine will try to find the sea water cline in the operation to conceal and wait for attack.

In the morning, at eight o'clock Eastern Time, US Secretary of the Navy Admiral Ronald three-star, Chairman of the Joint Chiefs of Staff four-star Admiral Levi, and Secretary of Defense Cook hurried to the oval-shaped office of the US president in the White House.

"Mr. President, we have discovered a Chinese nuclear submarine one hundred and fifty nautical miles off the east coast of North Carolina." Secretary of the Navy, Admiral Ronald, reported.

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