Based on the above points, what Fan Keqin needs now is the kind of diving equipment that is very simple, and does not affect flexibility, and is the lightest.

And this thing can be completely made by Fan Keqin himself, it just depends on whether you have imagination or not. There are also very few things needed, a bicycle inner tube, a thin piece of bamboo, a five-meter hose, and fish gelatin. It's basically alive.

Bicycle inner tube, cut out the section that can be pumped, and then use the tire repair technique to connect the two ends of the broken together, use the glue to repair the tire, and a section of the inner tube to cover them, just stick to it. It looks like a circle like a small tire. How big is the circle, it doesn't need to be too big, it only needs to be 30 centimeters in diameter.

Then the bamboo piece is sanded extremely thin and modified to an irregular shape, glued to the front and back of the pneumatic rear tire, but it should be noted that the important thing is the middle position, drill a hole that is thicker than the thumb, and then thread the hose into it, and then modify and fix it with fish glue.

The material of the hose is similar to that of the tube used in this era, but it is thicker. If it's too fine, you won't get enough oxygen to breathe.

The hose that is more than five meters long must be enough, and a little surplus is out. The other end needs a breathing port in the mouth, and you can't do nothing, just let the frogman hold it in your mouth, it's useless.

In the same way, fish gelatin is used to carve a mold out of wood before solidifying, what is it? It's kind of like an English letter, with a capital H. The middle horizontal is the part where the hose passes through the shaped fish glue, and then it should be glued with waterproof glue. In this way, the frogman bites the H-shaped fish glue in his mouth, and the vertical bars at the two ends of the letters are not actually the appearance of small sticks. It's just that when you look at it from the side, it looks like an H.

When viewed from the front, it is long and flattened, and it looks like a pacifier. The frogman's lips and teeth are gently attached to the two concave parts above and below H, so that they can be closed tightly without much effort, so that no water can seep into the mouth. There are also stoppers on both sides, so just put it in your mouth and you're done.

In this way, the frogman can breathe smoothly under the sea, as long as the depth does not exceed the length of the hose. The buoyancy of the inner tube is very strong when inflated, and it can carry the other end of the hose and stay on the water at all times.

In addition, there are some bamboo chips, as well as paint and so on. Even if people see it in broad daylight, they will only think that it is just a piece of debris floating in the water. It's so common that no one would suspect it.

Is it simple? It's so simple that we can even make it ourselves at home. Naturally, it is impossible to get a rare place to live with Fan Keqin, who has the resources of the entire Security Bureau.

Fins have been available in this era, made of rubber, and their appearance is almost no different from that of later generations. In this way, Fan Keqin experimented a set, and personally went into the water, experimented back and forth a few times, and found that he could not swim too fast, which caused the float on the water surface to be driven too fast, not very natural, and there were almost no other problems.

So in one breath, Fan Keqin directly made a full fifty sets of diving equipment. It's not worth much anyway. After doing it, Fan Keqin took his things and went to a secret blockade of water again, and handed over all the things to the frogman to start training and using.

Fan Keqin sat on a gunboat, looking at the debris floating on the water, moving forward, looking at his watch from time to time to calculate the time. You know, there is now a person under every piece of floating debris, and from the Navy's warehouse, a dozen new mines have been pulled in again. It's just that the charge part of it has been removed and cannot explode, and the rest is no different from a normal mine.

As time passed, human heads popped up on the water. Fan Keqin immediately asked, "How is it?" ”

Zhuang Xiaoman, who was in charge of timing next to him, said: "It takes 35 minutes to dive 1,000 meters underwater, which is the fastest result." The slowest was forty-seven minutes, but it still completed a kilometer of sneaking. ”

Ma Chunliang, who was in charge of frogman training, said beside him: "Sit, in fact, it is not a thousand meters to come and go, or even two kilometers may not be enough." You must know that if those ships enter the dock and dock, there is still a distance between the dock and the dock, and the farthest is even more than 3,000 meters if you count all the distances back and forth. ”

Fan Keqin nodded and said, "I know, this is the first time to test the equipment." Ask them how they're feeling. If you can, increase the amount of training, and the final standard for everyone to pass is that with a mine, they must complete a 3,000-meter sneak in two and a half hours. ”

In fact, this standard is not too strict set by Fan Keqin, but it is definitely enough. You know, in reality, frogmen only carry mines when they "go out". On the return trip, the mines had already been installed, so there was no need to bring them, and it was much easier.

So the actual situation is that it is only half the journey, and it is necessary to bring mines, but now he requires to carry mines directly throughout the journey, just to exercise their physical fitness, so that frogmen have sufficient physical strength, so that they can be prepared. When it comes to the actual mission, there is no such mistake as exhaustion.

You must know that in some special forces in later generations, the training of stealth is much stricter than this, and there are 5,000 or even 10,000 sneakers at every turn. And two or three times a day. They also carry a variety of weapons and heavy equipment. Fan Keqin's standard at this time was far worse than that of some special forces in later generations.

But everything must be gradual, as the so-called speed is not reached. If you don't care about it, you will only practice waste, practice injury, and you won't get any results at all. Some members of the special forces in later generations were also selected by the top members of various armies, and their physical abilities and other qualities were extremely high.

But these frogmen under Fan Keqin, although they have good water quality, but in the end, they have just received professional targeted training, and this process is really impatient, but fortunately, Fan Keqin's time is still enough now, and he can train properly.

It is said that Ma Chunliang is now a member of the Security Bureau, with a high-ranking military rank and a captain of the Field Service Corps. But in fact, the internal official code name of this unit is called Sea Lion.

Fan Keqin said: "The brothers must not have trained like this before, so they must keep up with the nutrition, at least two meals of meat a day, and three canned American meat ...... a day."