I saw the rest of the warships approaching me quickly.

Li Yunlong did not have any fear, because the Qianlong nuclear submarine had an incomparable speed advantage.

"Speed up!"

As the co-helmsman continued to maneuver, the speed of the Hidden Dragon increased.

The speed of the submarine is about 40 knots, 1 knot = 1 knots / hour = 1.852 km / h, which is 74.08 knots.

It doesn't seem like it's very fast, but it doesn't hurt without comparison.

The speed of Japanese warships is basically 25 knots, which is about 46.3 knots, which is a big difference!

The speed of Japanese submarines is even slower, basically only 15-20 knots, that is, the speed of nuclear submarines is more than twice the speed of Japanese submarines, nearly three times.

"Purr...... Purr ......"

The Hidden Dragon picked up speed.

Originally, the sneaking resistance under the water was very large, after all, the whole ship was in the water, and it was already very fast to have such a speed.

Because the destroyer at the front was killed, there were now three gunboats and two coastal defense ships left in pursuit of the Hidden Dragon.

"Launch depth charges!"

As they approached the submarine Hidden Dragon, the captains began to give orders to fire depth charges.

Depth charges, which are the most effective and direct way to deal with submarines. During World War II, deep-bomb anti-submarine warfare has always been the most important anti-submarine means, and the anti-submarine record in the war ranked first among mines, aerial bombs, and naval guns.

In general, depth charges usually have a detonator for detonating the explosive, which is connected to a firing pin and spring. After being put into the water, as the water depth increases, the water pressure will gradually increase, overcome the elasticity of the spring and compress the firing pin inward, and finally the firing pin will fire the detonator and finally detonate the depth charge.

A large amount of high-explosive charge contained in the depth charge generates a large number of shock waves after being detonated by a detonator, which destroys the hull of the enemy submarine through the conduction of seawater to achieve tactical purposes.

"Whoosh...... Gurgling ......"

Depth charges began to enter the seawater.

These Japanese warships are all warships with rich combat experience, and originally according to the speed of normal submarines, plus estimates, these depth charges should have destroyed this underwater submarine!

However, what they do not know is that they are facing nuclear submarines!

The speed of the nuclear submarine is extremely fast!

Nearly ten depth charges above are constantly falling, and the submarine Qianlong is shuttling through at a rapid speed!

This scene is very shocking to watch.

Depth charges during World War II were engineered to prevent them from exploding until they reached a predetermined depth.

Therefore, when the submarine is driving below, the depth charges above will not explode!

"Whoosh ......"

"Gurgling ......"

Inside the Qianlong, the first mate and the staff officer all said to Li Yunlong: "Brigade commander, the enemy is dropping depth charges, and we are passing under the depth charges, it's really thrilling!" ”

It doesn't matter, these depth charges can't help us! Li Yunlong had a confident smile on his face.

Speed is king!

Although the Qianlong nuclear submarine is not as advanced as the 21st world's most advanced nuclear submarine, in World War II, this nuclear submarine is already the most powerful.

"Huhuhu...... Whoosh ......"

"Gurgling ......"

The depth charge is set to a depth of about 50 meters, and the depth charge will be detonated as soon as the depth is reached.

However, even at the speed of depth charges, the Hidden Dragon has long been out of the bombing area.

Moments later, when the depth charges reached a depth of 50 meters, the water pressure penalized the springs, and then detonated the explosives inside the bombs.

"Boom...... bongbongbong……”

"Gollum...... Snore...... Whew......"

The violent explosion in the river water, after the detonation, produced a large number of shock waves, causing tumbling waves inside the seawater, and the powerful impact force exploded directly in the river 727.

Even if this is in the middle of the sea, the shock waves and air waves are constantly rolling, and even the warships on the sea surface feel the air waves and waves, forming a state of turbulence.

If the submarine is still in the explosion area, even if it cannot be sunk, it will be affected and affected.

Because of its low price, ease of use, and high charge filling factor, deep bombs can be used in shallow waters, and are usually attacked by salvo scatter coverage. More than half of the submarines lost in World War II were destroyed by deep shells.

Li Yunlong's submarine Qianlong at this time was already outside the range of the explosion, and not only that, but also locked on three gunboats.

"Report to the brigade commander, the target is locked!"

"Everything is ready!"

"OK, launch!" Li Yunlong said loudly.

"Whoosh...... Gurgling ......"

A total of six torpedoes flew out quickly, causing a burst of blisters in the water, and then hit the three gunboats perfectly!

“bongbong…… Rumble ......"

Three gunboats were hit at once, and then began to sink in the sea.

The submarines sent to pursue Li Yunlong this time were a total of one destroyer, three gunboats, and two coastal defense ships to pursue the Qianlong, and now the last two coastal defense ships remained.

Nani ...... What's going on! ”

The captain of the Coastal Defense originally thought that after firing so many depth charges, he would definitely be able to kill the submarine.

But unexpectedly, the depth charge exploded, setting off a burst of explosion, and the submarine was not sunk, but its own fleet lost three more gunboats.

Then the captain looked at the sonar screen and found that the submarine that was directly in front of the fleet had suddenly become the rear of the fleet.

The three gunboats were sunk by torpedoes fired from the rear.

"How could this be, it was clearly in front just now, and suddenly it became the rear!" The captain of the Japanese warship had experienced a hundred battles, and it was the first time he had seen such a situation.

At the speed of the submarine at that time, it was not possible to have such a large displacement in such a short time.

"Oops, hurry, hurry up and speed up, can't be locked by local submarines!"

The Japanese captain roared and roared, very nervous.

A total of six ships came to pursue this submarine, and now the last two coastal defense ships remained.

Coastal defense shipThe Imperial Japanese Navy was a special ship classification during World War II, and before World War II, it was generally called a coastal defense ship when the old main battleships and cruisers were downgraded to coastal defense and training tasks.

In World War II, it mainly refers to a small ship that simplified its craftsmanship and armament to be mass-produced for patrol and escort duties.

To put it bluntly, these coastal defense ships are backward warships.

How could this have escaped the lock-on of a nuclear submarine!

In the submarine Qianlong.

Li Yunlong looked at the radar screen and watched the two coastal defense ships speed up, and at the same time kept dropping some depth charges and depth mines.

Depth mines are one way to deal with submarines, which is to drop a mine in the sea and then cause a violent explosion when the submarine touches it.

"Huh...... If you want to escape, it's not that easy! ”

Li Yunlong immediately gave an order: "Immediately lock on to the target and open fire!" ”

"Yes!"

After several encounters with the Japanese fleet, these submariners have a lot of combat experience and experience in operating submarines.

In addition, the radar is more advanced than sonar, which can quickly lock on to the target!

So, about a minute or two later, the submarine Qianlong locked on to the two coastal defense ships of the Japanese army.

The coastal defense ship is a backward warship, and in the face of this ultra-advanced nuclear submarine, there is no escape at all!

The captain of the Japanese ship also seemed to feel that something was wrong, and hurriedly used the communication equipment in the warship and began to call Ersaburo Riverside!

"The conquest coastal defense ship reported that the enemy's nuclear submarine is extremely fast, and it is predicted to be more advanced than our nuclear submarine, and the speed and torpedo power are huge!"

"Now the two coastal defense ships in our fleet are in a strategic retreat!"

But if you want to escape, how can it be so easy!

At this time, the Qianlong nuclear submarine has already locked these two coastal defense ships!

"Fire!"

Following Li Yunlong's order, six torpedoes were fired directly and chased directly to the two coastal defense ships from under the water.

These two coastal defense ships are fast, but they are not as fast as torpedoes!

"Boom ........."

When the torpedo met the Japanese warship, it immediately exploded violently, penetrating the bottom of the coastal defense ship!

"Gollum Gollum ......"

A large amount of seawater poured into the dock, and then the two coastal defense ships began to tilt and finally slowly sank into the sea.

A total of six Japanese warships originally wanted to hunt and kill the submarine Qianlong, but in the end they were all sunk by the submarine Qianlong.

At this time, the submarine Qianlong was like a ghost in the water, constantly hunting and killing warships on the sea......