Leon talks about this history while sorting out the explosives - it turns out that Leon's background is not as simple as the CIA. Before joining the South African mercenary organization, this cargo was a member of the Delta Force, one of the most well-trained, well-equipped, and well-funded special forces units in the world today. Its training facilities and training fidelity are unmatched by other special forces except SAS. Thanks to its well-equipped, high-quality personnel and high mobility, it has the ability to deploy in a mobile manner "anytime, anywhere". Its main task is to deal with all kinds of terrorist activities that threaten the interests of Citigroup around the world, and it is an anti-terrorist fist force.

Previously, Leon was a vehicle driver and demoman in their squad before he was attracted to the CIA. 4 The one who played was called a supernatural - Leon once used C.4 to accurately crush a rock weighing more than 100 kilograms from the bottom into stones, but a porcelain plate for eating on this stone was unharmed.

"At this point, the boss is not boasting about me, even if I pull all the demomen in the delta, I dare to go up and slap me in the face one by one. Li Ang finally concluded: "Leave it to me, you can rest assured, others are afraid of explosives, but I am not afraid...... But boss, I'll have to trouble you about this. ”

"What?" Li Huan was stunned: "It's okay for you to let me throw a ball of explosives, I can't do such a delicate job." ”

"Boss, don't worry, I have set up these explosives, but the distance is too deep, if I dive a hundred meters like this, I will die on the ground without a decompression chamber. Li Ang handed the set explosives to Li Huan: "Only you can solve this problem." To be honest, I don't even know why you can dive so deep now, is this a high-level cultivator?"

Li Huan thought to himself, you must not know, a high-level cultivator will have to die if he wants to be as submerged as me.

Because although a cultivator's body is strong, it has to dive to a depth of 100 meters, and it stays underwater for a relatively long time, if there is no air, it will consume a lot of spiritual energy. Either he wears a serious heavy wetsuit and a huge compressed air cylinder, so that he can have enough air to stay underwater for a long time.

But Li Huan didn't need it, he connected the explosives of the line, returned to the rock wall, and carefully looked at the rock again, and sure enough, let him find a circle of very inconspicuous gaps - this is obviously used for disguise, if this is really the entrance, then when the gate is opened, this rock wall will be driven by the gate to retract into the rock formation next to it.

"Boss, are you ready?" said Li Ang's voice from the Spiritual Power Channel.

"Yes, are you sure this is safe?" asked Li Huan.

"My charge is absolutely safe, it just depends on the method you install, and you can stick this strip of explosives where you want to blast it. The amount of charge I charge will cause the entire rock wall to fall off about fifteen centimeters, and it won't cause much damage. Leon said: "The first time is a tentative blasting, we don't want to blow up all the obstacles at once, we only need to blow up a small gap in the rock wall used for cover, if there is really an obstruction inside, let's continue to blow up." ”

"Well, it's okay to have this idea, blow it up slowly one at a time, and it's better to blow it up a few times than to blow everything up at once. It doesn't matter much if it caused the volcano, but it's a secret document that the hermitage has kept for many years. Li Huan nodded and finished speaking, and began to set up explosives according to the method taught by Li Ang.

Under Li Ang's guidance, Li Huan was very neat, and it took more than 10 minutes to place a few pieces of explosives in that position, and at the same time plug in a few cables, and then connect the wires between the radio detonator that activated the electric detonator and the electric detonator, and then floated up on his own. If Li Huan doesn't come up, no one dares to detonate it underwater, not to mention other dangers, just the huge crater under him makes a few people dare not act rashly. When Li Huan came out of the water, several people withdrew to the seaplane, and Li Ang used a remote-controlled detonator connected to the cable to detonate the explosives.

...... Well, nothing happened.

"Failed?" Li Huan looked at the incomparable calm on the water, and his face was confused.

"Boss, you forget that this is at a depth of 100 meters underwater, unless it is the kind of deep-water explosion that people on the surface of the water can feel it, this kind of small-yield explosives are detonated, and people on the surface of the water will not feel any vibration and sound at all. Leon shrugged: "Coming to the plane, it's just to prevent the underwater volcano from being activated, let's wait and see, if the volcano is not activated, then there will be no problem." ”

Li Huan nodded, it is easy to judge whether there is a problem with the underwater volcano, if there is a problem, there will be smoke and boiling underwater within a minute, Li Huan waited for five minutes, and there was no movement at all underwater, which means that there is no problem at all. Li Huan dared to go into the deep sea, but it was better to be careful with the volcano, and after confirming that the volcanic pipeline had no signs of eruption, Li Huan dived into the deep sea again.

Originally, Li Ang and Rodman also wanted to go with Li Huan after a long time of water pressure adaptation, but this was too much of a waste of time. At this depth, only Li Huan could quickly ascend and dive, and Li Ang and the others could not be elites or cultivators. In order not to delay time, Li Huan naturally acted as an old scalper and personally went into battle.

Li Huan quickly dived to the depth just now, condensed a spirit balloon to illuminate, and sure enough, Li Ang didn't brag, the place where the explosives were just placed, the whole was cut into the inside at a distance of about 15 centimeters - at the explosion location, a hole about two meters in diameter appeared, and a fifteen-centimeter rock layer was separated......

The copper plate inside is exposed.

As Li Huan guessed, this depression was indeed a secret entrance. The entrance to the secret data room of the hermitage is one or two copper gates, but in order to disguise the existence of the entrance, there is a layer of rock about one meter thick attached to the outside of this gate, but because the gate is opened and closed horizontally or up and down, so this layer of attached rock also needs to be retracted with the gate into the surrounding rock formation, so this rock wall will be so flat.

Now the layer of rock wall used for concealment outside the gate has been completely blown open, and the gate inside is immediately revealed. Li Huan knocked on the exposed copper plate of the gate, and judging from the sound made, the thickness of this door exceeded thirty centimeters. Such a heavy gate, and it is very likely that it was made of special materials, can be soaked in seawater for more than 100 years and still not completely corroded by seawater - ordinary copper plates, although more resistant to corrosion than steel, have long been corroded.

Dealing with this kind of gate, Li Huan is the best at it, when he was in the Namibian desert, the alloy gate did not stump Li Huan. But Li Huan can't do this, the things in this secret document room may be the storage place of the final truth of this world. So Li Huan didn't dare to use the virtual space to collect it, he was afraid of destroying the things inside. Li Huan wanted to use aura to cut at first, but after trying a few times, he found that he was a fool - since the stones outside had a forbidden spirit array, how could this door not be?

So we still have to think in the long run, that is to say, Li Huan has to use methods other than cultivators to open this door. However, for this kind of thing, Li Huan is a complete layman, and he can only bring the underwater situation up.

Fortunately, Li Huan brought Li Ang and Rodman this time, these two talents are worthy of their professional backgrounds in the previous army, so let them

They may not be able to do something constructive, but they are better than anyone else at making them wreatheless.

Abel was the first to propose: "Let's use a cutting torch to cut the combustible gas with the best vapor pressure, the flame is easy to maintain, and the equipment is lightweight, and the underwater cutting depth can be about 100 meters." This time, we need to cut to a depth of only more than 10 meters, and it is completely possible to break through this gate in this way, and this kind of equipment is also easy to get. Big deal wait a few more days. ”

"I don't know about this, but you have to be careful to ensure the integrity of the gate as much as possible. Li Huan said.

After hearing this, Rodman shook his head: "This boss can't operate, only we are on it, even if we do full decompression, we can't stay underwater for too long, we need to break down this door as soon as possible." The most important thing is that this oxygen-hydrogen cutting method can deal with general materials, but it seems that it is a little insufficient to deal with this special copper manufacturing door. And the longer we drag on it, the more likely we are to be in danger. ”

At this time, Li Ang, who served in the special forces and specialized as a part-time demoman, finally found a way to speak, and he said with a smile: "This is not difficult, I still have many ways to break the gate, and I can also ensure the integrity of the gate." ”

As soon as several people heard this, they all looked at Li Ang.

Li Ang shrugged his shoulders and said, "Actually, it's not that hard to break through the body of this gate. To put it bluntly, this method is to use the power of directional medicine to directly blast the steel plate, and this method can be used to cut pipes, cable I-beams, cut holes, special steel, etc., and the cutting thickness can exceed 100 millimeters. However, this method is more violent, and it is easy to cause damage to the components near the cutting point. ”

Li Huan nodded thoughtfully and said, "It doesn't matter if the nearby components are destroyed, as long as the integrity of the gate is guaranteed, Xiao Maruki can block the opening in time." , if it is fried, it will be fried. It's just that we have this off-the-shelf equipment now?"

Li Ang shook his head with his hands spread out, "We didn't prepare this kind of equipment. However, this kind of equipment is very simple, and it can be easily purchased on the market, so let's fly to the Blue Coast first, buy it back and then break it. ”

Abel shook his head slightly: "No, we can't go back to the Blue Coast." As you can imagine, the first people have already followed us, and we took the seaplane just to get rid of them, and if we go back and forth to the Côte d'Azur, it will definitely be a complication, and maybe it will cause more trouble, so this method will not work. ”

"Then I have a way, but this one is more violent, which is to use the special thermite to forcibly melt this steel plate. ”

Thermite is a mixture of aluminum powder and refractory metal oxide, ignited with an ignition agent when used, the reaction is carried out violently, alumina and elemental iron are obtained and a large amount of heat is released, the temperature can reach a terrifying 2500 degrees Celsius, and almost most of the metal or alloy steel can be melted. When everyone heard this, they thought that this idea was reliable at first, and it was said that it was most appropriate to use thermite to melt this metal, but if thermite was applied in water, it would decompose into oxygen and hydrogen because of the high heat generated, and once these two products were mixed and ignited, it would cause an explosion.

This thing was invented by the German chemist Hans Goethesmith, and the original purpose of the research was to prepare high-purity metals without carbon smelting, but Goethesmith was keen to discover that the thermite method could be used for welding. In 1899 in Essen, Germany, the thermite method was first commercially applied to welded rails. The heat released during the thermite reaction can melt and flow out metals with high melting points, so the thermite method is widely used in welding rescue projects, such as connecting rails into a long rail. In addition, the thermite method is also an important means of smelting metals with high melting points such as vanadium, chromium, and manganese.

Of course, in addition to welding rails and smelting refractory metals, thermite also has a wide range of applications in the military, such as loading thermite components into the warhead-nozzle, because the reaction temperature is extremely high, it is used to make incendiary bombs, which can melt through armor and greatly improve the lethality. In the book "Rocket Artillery" written by scientists of the former Soviet Union, it is said that the charge of the warhead of the rocket artillery has the component of thermite.

In addition, when other elements are mixed with metal oxides and ignited, a strong redox reaction will also occur, similar to the thermite reaction. The elements can be aluminum, magnesium, calcium, titanium, silicon, boron – not limited to metals, while metal oxides can be boron oxide, silicon dioxide, chromium trioxide, manganese dioxide, ferric oxide, ferric oxide, copper oxide, and lead tetroxide, among others. Sometimes these reactions are also called "magnesium thermal", "silicon-thermal", "calcalthermal", "carbon-thermal" and so on depending on the reducing agent in the reaction.

In summary, this is a chemical that can produce high heat in the case of strong oxidation, and it is very dangerous if ignited underwater.

Li Huan expressed this worry, but Li Ang shook his head with a smile and said: "Boss, this is not a problem, I have several thermite formulas in my hand that can be cut underwater, as long as you are careful, it will not cause an explosion." And if Mr. Abel didn't feel sorry, the parts of this seaplane would be able to make enough thermite...... The boss gave me a hand, and it took about two hours to finish. ”

"It's okay, we just take the seaplane to hide people's eyes, you can dismantle it if you need to. I have a satellite phone here, so I can always reach the helicopter to pick us up. Abel immediately said: "I think this is a better way to cut out the whole gate, so that if there is a backflow of seawater, we can plug the leak in time." ”

"Boss, what do you see?" Li Ang turned his head to look at Li Huan.

Li Huan nodded, "If you're sure, then use this cutting method." On the premise of ensuring safety, you say, what do you need my cooperation to do?"

Li Ang slapped his thigh: "Since the boss said it, it's no problem, I promise you can enter that secret document before the sun sets." But boss, you have to help me, I'll look at the plane's two pontoons well. Can you grind it into powder?"

"Leave it to me. Li Huan nodded.

......

Underwater cutting with thermite is indeed the fastest way to cut underwater, but it is also the most violent. This cutting method is usually used in the cutting of ultra-thick steel plates, because this method is simple and violent, so it is expected that this cutting method can cut how regular the shape can be. For example, if the plasma arc cutting or electric arc cutting method is a rigorous fine stroke, then this thermite cutting method belongs to the impressionist painting......

However, this method is the most suitable way to break through the door of the secret archive that even Abel doesn't know what's behind it. Li Huan doesn't want to cut this gate into any regular pattern, as long as the steel plate that can break through this gate can drill into people, it doesn't matter if the hole is round or square. As long as it is not broken into broken pieces, it is not a big problem for small balls to plug the leakage in time. Although Li Huan felt that even if the door was broken, the small pills could be plugged here, its huge and soft body was a natural leak plugging material, but then the small pills would be too pitiful.

Li Ang did what he said, and with Li Huan's cooperation, it took less than half an hour to make enough underwater thermite

With Huan's cooperation, the gate was melted away from a large hole with a diameter of two meters. The moment the gate was broken, the sea water outside the gate did not pour into the gate, and it was clear that the inside of the gate was also seawater. In the morning the water pressure balanced, so there was no large influx of seawater.

"Hmm...... There is indeed water in it, I guessed this, but how are these documents preserved?" Li Huan curiously turned on a bright flashlight and looked inside.

Although there was also water in it, after Li Huan and the four of them entered the literature library, Li Huan hurriedly asked Xiao Maruki to plug the loophole, and waited until a few people found the relevant literature, and then let Xiao Maruko leave, and re-inlaid the copper plate with thermite to keep it sealed. After all, no one knows what is in this secret library, and even if there is water in it, if the water inside and the seawater outside are not of the same nature, the precious document will be damaged.

As for why there is water in this, Li Huan doesn't think it's unusual. He didn't think that this secret library was hollow in the first place - what an international joke, the secret library built more than a hundred years ago, even if the world's top forces were gathered, it was impossible to carry out such a huge project under 100 meters of water, let alone press the water out of it after the construction was completed, it was simply impossible. First, there was no air compressor that could resist the water pressure of 100 meters in those days, and second, even if there were, this volcanic pipeline could not withstand such a large internal pressure, and I am afraid that as soon as the pressure rises, it will collapse immediately.

After a long period of pressure adaptation, the three of them were able to stay underwater for a while. Thinking that Abel had considered going into the water, he brought a complete set of diving equipment, and with the support of Li Huan's virtual space storage, they could bring a lot of oxygen. So several people entered the secret literature room. But then, they were amazed by the grandeur of the interior.

Obviously, when the monastic society built this secret library, it was intended to hide certain secret documents that had to be preserved, but if they were to be released, they would cause chaos in the world. Therefore, this kind of base hidden under the water is the most hidden, more than a hundred years ago, it was almost difficult for anyone to discover this place - let alone more than a hundred years, even now, if it was not for Abel to lead the way, Li Huan and others would not be able to discover this place. Because this secret library is not permanently closed, and some materials that cannot be seen in the light may be re-entered, so this kind of underwater secret library cannot completely block the water, and it must be able to allow people to enter and exit smoothly.

To everyone's surprise, when everyone swam a short distance, the water in this secret document library disappeared, and in front of them, there was a vast hall, and the place where they came out was a small pool.

"There's air here...... How did they use a method to drain the water in the library 100 meters below?" Li Huan asked Xiao Fei's submachine to test the air, but what was disappointing was that the air here was toxic, and a variety of molds and corrosive substances were mixed in the air, which was not breathable by humans at all. Come to think of it, no matter what method the hermit uses to empty the air, after all, the air here has been precipitated for more than a hundred years, and only when you can breathe can you have ghosts.

After analyzing the air quality, Li Huan said decisively: "I'll come alone for the rest, and you can go back the way you came." The air quality here is so bad that you can't stand it. ”

In this case, Li Ang and the others naturally cannot follow in, because there is air in this kind of submarine cave, the air floats on it, and the air pressure can resist the pressure of the seawater, so the water will not pour in. The kind of person in the movie who enters such a cave and can immediately take off his wetsuit is pure nonsense.

It's very simple, although the seawater will not be poured into this kind of submarine cave, the pressure of the seawater in the cave is still very high, as if at this depth, Leon Rodman and the others are actually under pressure of up to five atmospheres, and they have been breathing with scuba, because of the pressure of seawater, the nitrogen in their bodies has already decomposed into his blood at this time.

If they swim in and immediately go ashore from the cave and take off their diving suits, and are directly exposed to the same air pressure as the sea level, it is equivalent to them coming to the sea level in an instant from a depth of 100 meters, and the helium in the blood will gush out of the blood due to the rapid decrease in air pressure, and eventually form a large number of bubbles in the lungs, which will directly burst their lungs in serious cases!

This is called decompression sickness.

Although it was not clear what the back of this hall was like, for the sake of safety, the three of them had to slowly float up - as for Li Huan, the three of them were not too worried, after all, he was a fierce and terrifying ancient cultivator who had mixed in the rainforest front. And he also has a large octopus outside the secret documentation. As soon as the big octopus came out, everyone was frightened, but knowing that it was his helper, he suddenly felt much more reliable.

Li Huan has a storm island reef necklace protector, in fact, he doesn't touch the water at all, he naturally won't worry that he will change to decompression sickness, so after seeing that the three of them exited the secret document is floating, he turned on the waterproof spotlights on his head and shoulders, and climbed ashore from the square pool in this hall.

The hall was completely dark.

The powerful waterproof spotlights on Li Huan's head and shoulders can only shine more than ten meters away in the water, compared to the fact that groups of tropical fish can be seen swimming freely from time to time outside the gate, after entering the gate, it completely becomes a silent and dark world. The surroundings are still invisible, but the spotlights on the top of his head and shoulders can now directly shine thirty or forty meters away because there is no barrier from the seawater, so Li Huan can easily see the high platform made of reinforced concrete seven or eight meters away from him - it seems to be one by one, square, and looks like a house.

Could this be the room in the secret archive?

But Li Huan didn't rush closer, but began to look around with the help of the light.

This submarine cave is obviously a huge naturally formed cavern, which is supposed to have been formed by the magma that erupted from the depths of the earth's crust during the volcanic eruption, mixed with a large amount of gas. This is a common occurrence in volcanoes, because when a volcano erupts, the huge heat melts all the rocks in the mountain, and once a large amount of gas is present, it is easy to form a huge cavity in the soft mountain. And if the impact of the gas is not strong enough to break through the magma, when the magma cools and forms rocks, these gases will be left in the mountain forever, forming this strange cave.

The huge cavern in front of me was obviously formed in this way, after all, just a few meters away was the huge crater.

The top of this cave is 100 meters above the water, and as for the length and width, although this "small island of volcanic tubes" is only a little above the water, the volcanic tubes are conical and cooled, so the area that sticks out is wider and wider the more it sticks out. At least Li Huan can't see the end with the naked eye.

In this huge cavity, except for the few concrete platforms that were artificially built, almost all of them were the most primitive volcanic mineral rocks as far as Li Huan could see. Obviously, this secret base was a natural cave that the Insurgency had accidentally discovered, and then it was slowly converted into such an underwater storage room for classified documents.

Li Huan watched it for a long time, and finally decided to go to those concrete buildings first.