“…… From this point of view, the port of Istanbul is also a point where the alliance may carry out retaliatory strikes, because the short-range surface-to-surface tactical missiles and cruise missiles deployed in Ukraine can directly attack the port of Istanbul and the surrounding fleets, military bases, industrial facilities and material reserves, but the alliance does not necessarily have the determination to force a military area with complete anti-missile measures, basically, if you take the port of Istanbul as an example, this requires the investment of at least 3,000 or more self-guided attack weapons of various types, This is undoubtedly a ...... that requires a lot of determination."

-- "Alliance Defense Weekly" article: "Where will we strike back?" 》

***

"Five minutes into the ACA Coast Guard drone observation range, ready to dive!"

An hour after Ling Yu and the others were dropped, on the side of the Turkish Strait that connected to the Black Sea, Ling Yu gave an order to the four people lying on the submarine after showing the information provided by C292 on his helmet.

The crowd was dropped about 140 kilometers away from the entrance to the north side of the Turkish Strait, although the ACA claimed that its small target scanning on the sea surface could cover a position 350 kilometers offshore, but after the alliance's continuous testing and reconnaissance, it was found that this coverage was meaningless - the old ACA shore-based radar was almost helpless against the alliance's new stealth coating, and only at a distance of about 120 kilometers would there be the danger of being detected by drones, so the delivery team had to be returned, in fact, For a long time, the surface defense of the Black Sea has always been the responsibility of the Black Sea Fleet, and these shore-based radar units have not been truthfully posted. The release of drones is unknown.

This is also why Rianna dared to let the C292 go deep into the end of the Black Sea after controlling the radar of the ACA air defense cruiser.

In fact, if the ACA radar soldiers in the Turkish Strait are absent-minded, this C292 can even fly above the strait in optical camouflage, until the periphery of the Istanbul port defense radar, of course, this kind of action is too risky, not to mention that the plane has to hover over the Black Sea to provide command information to Ling Yu and others, and naturally it cannot waste precious optical camouflage energy.

Ling Yu raised his head and saw that Herris made an OK gesture to herself, lying on the opposite side. Linya, who had an edelweiss painted on her helmet, also beckoned. Then the submarine, which was speeding at a speed of 150 kilometers per hour, slowly slowed down.

Helmet graffiti is a custom of the Confederate Frogman Force, originally used to identify people underwater with poor visibility and communication, and has since slowly developed into an art similar to the graffiti on the nose, except for Helis with Digital Stream Word Art 01 written on the helmet and Linya marked with edelweiss. Logan's doodle is naturally a sexy beauty in an American style. Jeunse, on the other hand, is a yellow Wordwork C. It was supposed to be the initials of the cavalry corps Cavalvy.

Ling Yu himself was a black lightning bolt painted by Jiesi for him, and the paint was a special dark light paint. I'm not worried about not being able to see underwater.

"Go into dive mode, turn on the mask, and when you're done, Herris is moving forward at maximum speed, turn off the radio."

Ling Yu finally gave the order, then raised his hand to turn off the radio on his helmet, and a fierce man plunged into the water, swam to the bow of the ship, and pulled the shelter like a tarpaulin, and the entire submarine immediately changed from a sharp four-edged bayonet to a shuttle with a perfect fluid shape.

Helis made a gesture, and the entire submarine began to dive, and more than ten meters underwater, the silent joint force of everyone installed the shield, and then drilled into the submarine.

After confirming that the other four people had all given OK gestures, Helis on top pulled the hand brake, abandoned the propeller and engine at the rear of the submarine, and then activated the water thrust system!

The pocket-sized submarine was violently jetted forward, and with the help of six water-thrust engines, the submarine could even reach speeds of up to 70 knots per hour!

However, this is not without a price - even if a submarine designed to reach a speed of 50 knots can reach 70 knots in a short time, the price to pay is a lot of power consumption and a significant reduction in the life of the engine, in fact, according to Han Fei's estimates, if the engine is kept running so overloaded, the submarine will be scrapped in two and a half hours at most.

But this is enough for Ling Yu and the others, who only need to consider one way, after moving on the surface of more than a hundred kilometers, next, everyone will cross the entire Turkish Strait before the life of this submarine is exhausted!

The 345-kilometer-long Turkish Strait is the only passage between the Black Sea and the Mediterranean, and it is also one of the major troubles of the ACA Mediterranean, because now that Spain and Portugal have been conquered, the ACA is equivalent to controlling the entrance and exit on the western side of the Mediterranean, but because the offensive operations against Ukraine have been crushed by the alliance again and again, so the alliance can still penetrate and raid the Mediterranean Sea through the Black Sea. As a gateway to the eastern side of the Mediterranean.

But, on the other hand, as in all other war zones, the League and the ACA still use this important waterway in large numbers, and as long as there is no fleet to block the strait, all kinds of ships, legal and illegal, continue to enter and leave the Mediterranean Sea with the help of bribes, and even the specially established coast guard in the port of Istanbul can only ensure that there are not too many infiltrators, spies and illegal goods entering the Mediterranean.

At this time, Ling Yu and the others walked under the ships cruising in all the Turkish straits, using the roar of the ship's huge engine and the waves of water to cover their tracks.

As planned, there were no accidents, the electronic map on Ling Yu's helmet display showed that the submarine AI and Helis were working together to correct the inertial navigation positioning according to the speed, mentally calculating the remaining distance.

The nearly three-hour voyage quickly ended in the silence of everyone, and under the precise control and navigation correction of Herris, the actual speed of the submarine was maintained at 70 knots per hour, and in the end, I don't know if it was an illusion or reality, Ling Yu even heard the deformation of the metal skeleton supporting the shield in front of him through the helmet.

Finally. The submarine, which had been maintaining a high speed, slowly slowed down, Ling Yu gently unfastened the bolt of the cover, tore off the almost broken cover and threw it aside, and then made an OK gesture at the others.

Helis turned off the submarine, but did not fill the tank, and the submarine was suspended in the water - it stands to reason that it would be best to let the submarine sink at this time, but this is already the sonar search range of the Istanbul base, and the sound of the sinking may be exposed by the detection of the operation of the guide.

It was still Helis who took the lead, looking at the two small water pushers at the bottom of Helis's new boots. Ling Yu even wondered if she had a feeling of being at home with diving raids.

But he didn't wait for him to think nonsense. The crowd had come to the periphery of the first line of defense in the port of Istanbul.

As the gateway to the eastern side of the Mediterranean, the port of Istanbul is extremely well defended, and from the very beginning, the ACA has considered the possibility of the alliance sneaking up on the sneak attack, and put a new-age version of the Royal Oak Fireworks for the ACA to enjoy. And technically. The kind of submarine that came with Ling Yu just now can carry five heavy torpedoes. A squad of four can wreak havoc on the entire Mediterranean fleet.

Therefore, the underwater monitoring of the Port of Istanbul includes a basic barrier network, a high-strength barrier network. Touch power grids, laser torpedo interceptors, multi-sensor monitors, and standing patrol frogmen.

However, when the details were discussed before, Herris had already said that most of the monitoring equipment could be hacked by herself, and the only thing that needed to be paid attention to was the standing patrol frogman, so naturally the girl took the lead.

Ling Yu and the others leaned back, stopped moving forward, and floated in the water, waiting for Helis to open the way for them.

Of course, there is nothing to say about the first basic blocking net used to block fish, Helis nodded, Ling Yu chased after him, and the frogman on his feet automatically fell off, revealing the metal hooks used to fix his feet underneath, and the young man who fixed himself on the blocking net took out the cutting equipment and began to cut.

Soon, everyone got through the blocking net, in order to prevent the frogmen patrolling outside, or the civilian frogmen from discovering the abnormality, Ling Yu also installed the blocking net back and gently glued it with underwater glue, so that at least it was impossible to see that this thing had been cut outside.

It's not so easy in the future.

The second barrier net is equipped with a collision sensor, and the first barrier net must not be a fish, so any local collision or damage will be directly transmitted to the control center.

The traditional underwater breakthrough is naturally not good, Ling Yu beckoned, Helis swam over, the girl floated to the side of the blocking net, observed it carefully, and then swam a little further and stopped next to a pipeline.

This kind of protective equipment is naturally impossible to control the zhì panel outside the blocking network, but it must need a cable to communicate, generally speaking, ordinary people are unable to access the device through the guò cable, but this happens to be Herris's specialty.

However, just as Helis was taking the tool out of her fanny pack and preparing to cut through the hole in the blocking net, Jesse, with the golden letter C painted on her helmet, suddenly pulled her.

This one is a safety line because it's so new.

A line of text flashed on Jiesi's helmet, Ling Yu turned his head to look again, and sure enough, this cable is obviously much newer than the protective net, and the location is also obvious, it is obviously a deliberately designed safety line, this kind of safety line has a very thin and thin energized metal wire buried in the rubber skin, once the skin is cut, it will automatically alarm.

Helis apparently understood what Jesse meant, and withdrew her knife and pliers, and she swam and deftly up and down the water like a fish for a while, and then found a thread with the same color as the wall in the lower right side of the net.

As soon as Helis steadied his feet, he stretched out a knife and pliers to cut the cable, and then Helis spit out a string of blisters, closed his eyes, and the light on the control panel in the blocking net began to flicker not far away.

Then, a gap suddenly opened in the blocking net.

It is a maintenance passage for the maintenance of frogmen to enter and exit, and it will be better to go this way, and it will not leave a record.

Ling Yu looked at the words displayed on Helis's helmet, and then glanced at the blocking net that was more than ten meters wide and couldn't see how deep it was, and nodded-if this blocking net were to be opened entirely, it was estimated that the Heavenly King Lao Tzu would be alarmed, and it would be impossible for the ACA to make such a big move in all the maintenances.

The access door closed behind Ling Yu and locked perfectly, leaving no trace behind Herris.

The third line of defense was the high-voltage power grid, but Herris easily found the cable and stopped the power.

The fourth is more than a dozen laser interceptors to intercept torpedoes that rush into the waterways of the port, the sensors of these things react only to objects moving at high speed and are therefore ignored.

……

There are more than ten defenses before and after, only the first two and the one of the monitors cost Ling Yu and the others a little effort-it can also be clearly seen from here that although the defense system is very perfect, the defenders are a bit floating - although there are more than twenty multi-sensor monitors that are most likely to cause problems to Ling Yu and others, half of them are either damaged or turned off, and most of the remaining half are also a little problematic, so the sensors that need to be dealt with one by one have been reduced a lot, This greatly accelerated Ling Yu's penetration speed.

No system is secure, because no matter how perfect the system, how perfect the regulations, how advanced the machine, as long as someone is still making judgments, there will be loopholes.

Unconsciously, Ling Yu suddenly thought of Helis's words, as well as the huge cylindrical space station hundreds of kilometers above his head. (To be continued......)