After Zhuang Xiaoman left, Fan Keqin roughly recalled his thoughts and began to study the plan again. After a while, Zhuang Xiaoman once again handed over an intelligence sent by Kong Xinran, the first secretary of the Intelligence Department.

Gave it to Fan Keqin.

This is the intelligence sent back by the military commander in several coastal port cities. So far, no trace of the Japanese warship has been found. Of course, this is not surprising, because the Japanese warship has already left the Xiamen pier after the supply was completed. According to

According to the calculation of distance and course, we are in the "three no-reliance" zone in the offshore at this time. Therefore, the "observation points" set up by the Military Command and Security Bureau on the coast will naturally not be able to see these warships. This is a routine report, and there is nothing wrong if they are not discovered.

What does it mean?

Fan Keqin put away the several drawings he had researched and drawn, and gave the required materials to Zhuang Xiaoman again, asking him to send them to the Purchasing Section of the General Affairs Office. He asked them to buy a few more sets.

In this way, Fan Keqin began to prepare for this plan non-stop. Time flies very quickly when people are busy, so a week flies by in the blink of an eye. Almost everything that needs to be prepared has been prepared.

After repeated experiments with the magnetic mines in charge of Jiang Bin and Du Shengli, the charge volume was no longer occupied by four water injection chambers in addition to the original charge section, but was changed to occupy five. In this way

, and then the depth-fixing device remains stationary at the zero position. Once it enters the water, it is directly two meters below the water surface. At this time, you only need to adjust the depth-fixing device by one step, and the mine will remain snorkeling at a position of three meters below the water surface.

The increase in the amount of explosives means the increase in power. All have two sets of detonation systems, which can be said to be double insurance. As long as one of the systems can operate, the mine will inevitably explode.

The same goes for the timer devices. They all come in two sets. Moreover, Jiang Bin and Du Shengli also came up with a very good way to prevent the timer from leaking. That is to coat the timer with a thick layer of wax, and then use linoleum.

Inject the grease from the burned paper into all the gaps again.

After having two layers of waterproofing, the timers used for experiments have been lying in the water for three days and are still functioning normally.

The training of frogmen was quite difficult at the beginning. In fact, armed swimming also existed in this era. But it was basically just a name. Very few troops trained like this. The main reason was that after high-intensity training, soldiers had a large appetite.

Growth requires nutrition. Which warlord is willing to eat and drink freely?

It's pretty good if it can keep you from going hungry. In this case, Chiang Kai-shek's Central Army might be better, but that's just because its equipment is better than other local armies. Food and drink...

I can say that it's okay. But doing a lot of training is tantamount to wishful thinking.

Fortunately, the twelve frogmen selected by Fan Keqin had grown up by the river or the sea. Isn't there a saying that those who drown are those who know how to swim?

These dozen brothers have not drowned yet, which shows that the water quality is indeed good. However, since these people have entered the workplace, it is naturally impossible for them to swim like they did when they were children. They do not have the conditions to take a bath in the bathhouse.

Up to the sky.

But swimming is one of those things that once you learn it, you will never forget it. Twelve frogmen trained for a day in a water area designated by Fan Keqin to be blocked, and they have already regained their feeling. There are three boys with the best water skills.

, and even after a sudden dive, his head popped up on the other side of the river.

Seeing Fan Keqin in his eyes, I feel that these people have good water skills, although the breath-holding time is definitely not as good as mine. But relying on human talent alone is absolutely impossible. This is mainly due to the situation in sea water and river water.

It's bound to be different.

In addition, the pier of a large ship even extends hundreds of meters from the shore. And you can't really dive hundreds of meters vertically from the pier controlled by the Japs or the puppet government. You must start from a place where the defense is the most lax, or even

It was a very far place, so you had to dive there. He remembered the world record of later generations, that a person could dive and swim back and forth for several hundred meters without any breathing equipment.

But this is conditional. First, this person is in a calm swimming pool. Second, this person needs to breathe oxygen for a long time before officially starting, so that the oxygen content in his blood can be maintained at the highest level.

Level. Third, this person has been training in this area all year round.

Fan Keqin doesn’t think that his frogmen are better than the world record holders decades later. After a series of the most scientific preparations, a lot of training, and in a calm swimming pool, they can only dive hundreds of hundred meters.

It's just 3 meters, but it still doesn't meet my requirements. For this reason, Fan Keqin specially made a set of diving equipment himself.

The reason why people are human is because they make and use equipment in large quantities. Never say that people have to rely on themselves. In fact, equipment is also made by people. There is really no shame in using equipment made by humans themselves.

For example, someone has been practicing martial arts for ten years, and another spent a year making a homemade gun at home. After the two people met, this person shot the martial arts practitioner away. You must not say that the other person was opportunistic and used foreign objects.

The other side wins.

The loser is the loser, don’t make any excuses. If you are a real hero, you must learn a lesson. This time you know the power of firearms, then you should also start to learn this knowledge and strive to make better ones with stronger range.

Use your gun and strive to surpass the opponent. This is what a true hero does.

Therefore, it is really normal to use various equipment. Never be superstitious that the human body can resist the super weapons invented and created. Otherwise, you will really die miserably.

The thing Fan Keqin asked Zhuang Xiaoman to give to the purchasing department a few days ago was an underwater breathing device designed by himself.

In fact, in this era, there are already things like diving suits. The kind that can work underwater for a relatively long time are too bulky, a bit like a space suit, with a thick breathing tube connected to the inside.

A super armor that looks like a can.

Fan Keqin couldn't use this thing for his frogmen. The first reason is that it is too bulky. You must know that the actual situation is that the frogmen need to be underwater and sneak at least a few hundred meters, or even thousands of meters. In this way, the canned

The can-type diving suit consumes too much physical energy. The second is that it is not flexible enough. They have to move with mines underwater, and also need to set up timing devices, etc. The can-type diving suit cannot be operated at all. The third is that,
Chapter completed!