When the target shooting is over, the military training is over.

Mordin and his classmates returned to the dormitory, and Yan Ran's call came.

"Mordin, is the military training over?"

"Well, it just ended. ”

"Me too, how many rings do you shoot?"

"Hmm...... It's all 10 rings!"

"Haha! You brag!" Yan Ran giggled: "You didn't miss the target, did you?"

"No, how many rings did you hit?"

"95 rings!" came a smug voice from the headphones.

No wonder she asked about the results of target shooting as soon as she came, it turned out that this girl was even more powerful than Zhou Jie.

"You're a heroine!" Mordin complimented.

"Of course!" Yan Ran replied proudly, "Tomorrow is Saturday, we should go to diving training!"

"Okay, where?"

"There's a diving training hall just 100 meters south of the International Cruise Center, and we meet on the first floor at 8 o'clock. ”

"Okay, see you tomorrow at 8 o'clock. ”

"Okay, 88!"

Hanging up the phone, Mordin was in a good mood, he then took a shower and went to the cafeteria to eat.

The next morning, Mordin got up. After washing, I picked up my backpack, and saw that my classmates in the same dormitory were still sleeping, so I gently closed the door, went downstairs for breakfast, went out of the school gate, and took a car to Dongdu Wharf.

The diving hall is easy to find, and when Mordin walked into the door, he found that Yan Ran had not yet arrived, so he looked around and found that there was a huge water tank on one side of the hall, which was very high, and it went all the way out of the top of the hall and led to the upper floor. Through the transparent glass of the tank, Mordin saw a lot of marine fish swimming leisurely in it. Mordin walked over and found a 2-meter-long shark swimming among the aquatic weeds, and he was shocked.

"It's not going to be practicing diving in this tank, is it? what if you get bitten by a shark?" Just as Mordin was worried about his own life, Yan Ran came in.

"Mordin, don't look at it, the coach is waiting for us. She greeted Mordin as soon as she entered.

"Yan Ran, there's a big shark in this tank!"

"Really?" Yan Ran walked over curiously and saw the big shark: "We practiced in this diving pool, how can there be sharks?"

Mordin secretly looked at Yan Ran's face and found that there was not much fear on her pretty face.

"Let's go, let's go up to the 5th floor. Yan Ran turned his head and greeted Mordin calmly.

"Good!"

The two took the elevator to the 5th floor.

On the 5th floor is a very large hall with a huge pool in the center of the hall where people are already practicing diving. Mordin guessed that this pool was the glass tank he had just seen in the lobby on the first floor, and there was a large shark in it.

Yan Ran led Mordine to their coach.

The coach is a German named Hans who is over half a hundred years old, with a brown-red face, blonde curly hair, and a mustache, and the whole person looks very lean.

Yan Ran communicated with the instructor in English, she smiled and pointed to Mordin, and gestured that Mordin was a diving white.

Hans shrugged his shoulders, spread his hands to show that he understood, and came over to Mordin and told him to start with the basics of snorkeling, at least 50 lessons here, before he could issue a certificate for Mordin to dive in open water, and then hand them two number plates.

Yan Ran led Mordine through a corridor, to the locker box, took out the diving equipment, and then went to the locker room to change their diving suits.

Mordin quickly changed into a wetsuit and went to the pool, where Hans handed him a plastic hose and told him that it was called a snorkel, and that today he was going to start snorkeling to practice his balance on the water, and to get familiar with using his flippers to control the direction of his body in the water.

As he was talking, Yan Ran came over from the locker room.

Yan Ran, who was wearing a tight-fitting diving suit, was convex and backward, and his figure was very proud, and Mordine was a little obsessed with it.

Hans patted Mordine on the shoulder, shook his head with a smile, and went over to help Yan Ran check the diving equipment. After everything was checked, Yan Ran put on his diving equipment, walked to the edge of the pool and put on his fins, then made an OK gesture to Mordin, stepped forward with one foot, and jumped into the water.

Mordin knew that Yan Ran had practiced diving when she was in Mardy, so she didn't need to learn it from scratch like she did, and she could just jump into the water and practice. There are two professional ambulance crews underwater, who will monitor the practitioners' every move at all times.

When Mordin saw Yan Ran diving into the water, he suddenly remembered something, and he hurriedly said to Hans, "Is there a big shark at the bottom of the pool?

Hans smiled and said, "Don't worry, it's a blue shark, it's very gentle, and it won't attack humans." ”

Mordin put on his goggles, put on his fins, and jumped into the pool with one foot as instructed by Hans, then bit down on his snorkel, swing his flippers, and began snorkeling training.

Although Mordin grew up in the mountains, he was very water-based. There is a large lake at the foot of the mountain not far from Taixuguan, the water of the lake is crystal clear, and there are many kinds of fish and shrimp. He and his playmates like to play a game called "Catch Shui'e", a kind of water insect that is particularly good at escaping, and the friends are on the water, 3/5 people form a team, and the goal is to catch the child who plays Shui'e. Mordine often plays the role of Shui'e, he is particularly good at snorkeling, and a fierce man can dive far away, and often succeed in escaping the encirclement of his playmates.

So snorkeling in this kind of pool is a piece of cake for him. Although Hans asked Mordin to master many things, he was able to do it very quickly, swimming with flippers on, as if adding "wings" to the water, he could swim very quickly in the water.

In the end, seeing that he couldn't find anything wrong, Hans reluctantly allowed Mordin to end his snorkeling early and start diving with real equipment.

Compared with snorkeling, there are three main types of equipment for equipment diving: the gas cylinder includes a first-level valve, a second-stage valve and a mouthpiece, and a buoyancy adjustment device, which is called BCD in the industry, and a counterweight, which is actually a few pieces of metal used to adjust the weight.

Hans introduced the use of these equipment to Mordin in detail, and it was not until Mordin repeatedly said that he understood that Hans helped Mordin put on the equipment, checked it for a long time, and then told Mordin to take precautions underwater again, and then let Mordin jump into the pool.

As soon as he entered the water, Mordin realized the difference between equipment diving and freediving.

The first is that his breathing is tense and rapid, and there is a feeling of suffocation, and it took Mordin a while to adjust.

The second is that the diving equipment is very heavy on the back, it is difficult to maintain balance in the water, the movement of the fins is slightly wrong, and the heavy gas cylinder drags him to the sky, which provokes Yan Ran, who is watching the lively laughter, and is almost choked into the water. Hans gestured desperately at him from the side.

Mordin understood what he meant, he pressed the deflation button of the buoyancy control valve, the buoyancy decreased, Mordin quickly landed on a platform and finally stood firm, after adapting to the underwater balance, under the signal of Hans, slowly inflated the buoyancy device to increase buoyancy, and then Mordin slowly floated in the water, tried to control the balance of his body with flippers, and began to dive.

Diving in the water itself is not difficult, but the diving qualification is divided into several levels, because in the state of underwater diving, people can not breathe freely, all rely on the equipment to maintain, this is a very dangerous state, in case of equipment problems, people are very dangerous, not only to prevent the danger of underwater suffocation, but also to prevent the occurrence of too fast to rise and get diving disease.

Students must learn to deal with various emergencies, and at the same time learn to rescue the dangers that may occur in their companions, so the first two in the diving level are emergency handling and rescue subject training.

Under the command of Hans, Mordin tried various unexpected situations such as the mouthpiece falling off, the mask being flooded, the foreign body entanglement getting rid of, the heavy block falling, the sudden loss of pressure in the gas cylinder, and the foreign body plunger.

Fortunately, Mordin was "gifted", and in less than half an hour, he learned all the emergency handling subjects that Hans could teach.

In fact, for Mordin, it is not difficult to complete these subjects at all, not that he really has any talent for diving, but the key is that he has a secret weapon.

When a person has an accident underwater, the biggest danger still comes from personal panic, such as diving suddenly found that it is difficult to breathe, the cylinder is out of air, at this time most people will immediately have a feeling of suffocation, out of instinct to desperately swim upstream, which is very dangerous.

And this situation does not exist for Mordin, because his modified respiratory system has a far more oxygen storage capacity than ordinary people, and he can stay underwater for at least 30 minutes when he holds his breath. His ability to hold his breath for such a long time is even more than the ability of most mammals in the ocean, what else is there to be afraid of.

Hans was completely stunned. This student can learn what he teaches, and he never makes mistakes, and after only half an hour of teaching, he knows everything. He stared at Mordine in the water, as if he were looking at a monster from under the ocean. Mordin motioned for him to move on to the next stage of training, but the old man was very stubborn and firmly disagreed. What he can't figure out, he must figure out before he can continue to do it, and the stubbornness of the Germans, Mordin can be regarded as a teacher.

After a 20-minute stalemate underwater, Hans motioned for Mordin to float and go to the water.

It seemed that the old German man couldn't stand it, Mordin swung his flippers and floated to the water, Yan Ran also floated up, and the two bombarded the old man in turn, and finally said that the old man was moved, and agreed that they would start the training of the next subject in the afternoon.

After a brief lunch and a rest, Mordin and Yan Ran began to train in diving and rescue.

Underwater rescue requires two people to practice together.

After Hans finished the rescue demonstration, Mordin and Yan Ran began to play in the water.

Yan Ran had actually learned rescue and obtained a certificate in Maldi, but the stubborn German coach had to relearn it before she was willing to teach the following subjects, and Yan Ran was also happy to practice with Mordin, so the two trained together underwater, and they were busy. Hans stared nervously at the two of them, and immediately signaled to float up at the slightest problem.

There are 29 international sign languages prescribed by the diving community to help companions exchange information with each other, such as "I am running out of oxygen" and do a neck wiping movement, such as "danger", "follow me", "I am cold" and so on. The most important thing in underwater swimming is to never go alone, to be in a group of two people, and to keep an eye on each other's movements, and to take appropriate rescue measures immediately if a companion is in danger.

Underwater rescue is not only about the disposal of equipment, but most importantly, about giving confidence to people in danger. And in case of the worst situation such as drowning in a companion, the rescue at this time should be particularly careful, because once a person is drowning, the instinct to survive will make him scratch everywhere and struggle desperately, and it is particularly dangerous to get close to the drowning person at this time.

The two of them trained underwater like this. It can be seen that Yan Ran trusts Mordine very much, no matter what dangerous situation arises, she always waits there quietly, and never panics. Whenever Mordin is rescued, she will give him a big thumbs up, which makes Mordin excited.

They also "invented" several unique gestures for the two of them to use, such as "I see a shark", "There are aquatic plants in front", "Take a picture of me", and so on. It's easy to confuse with more gestures, but the two of them seem to have a tacit understanding, and they can definitely accurately understand the meaning of each other's gestures, and they can't make a mistake, after all, they have been sitting at the same table for three years, and they are telepathic to each other, and they are no longer familiar with each other.

The rescue subject was impeccably completed, and the old German man Hans sighed and issued them a certificate of primary underwater rescue in confined waters.

On the second day, the closed water diving training began.

A deep dive is defined as a dive to a depth of more than 10 meters. There is pressure underwater, and for every 10 meters of dive, the pressure increases by one atmosphere, which causes problems for diving.

The first is internal pressure balance. The cavity in the human body will have a pressure imbalance under strong water pressure, resulting in earache, dizziness and other conditions, which requires rebalancing and other measures. In the process of floating, the pressure decreases rapidly, and the nitrogen dissolved in the blood will vaporize to form a thrombosis, and if it is not properly handled, it will suffer from diving disease, so there must be a stay time in the process of floating, and the nitrogen in the blood must be released slowly.

Rescue in deep water is a complex process, people in the deep water area of the light is dim, the line of sight is not good, the mental pressure is high, the psychological collapse is easy, then it is more necessary for the two people to trust each other, deal with it properly, and rescue in time.

But in any case, Mordin and Yan Ran can dive deeply.

Two meters apart, the two dived to the bottom of the pool, one behind the other, with Hans following closely behind them, monitoring them for foul play. This time, both of them were unusually careful, and they completed various actions in an orderly manner. Because Hans said it first, as long as they violated the rules, even the slightest mistake, they immediately increased the training time by 1 hour.

The further down the light became, the dimmer it became, and the two of them breathed steadily and slowly dived in. Fish swam around them, all sorts of strangely shaped stones seemed to greet them, as if they were contemplating in the water, and there was a broken fishing net in front of them, and Mordin took Yan Ran carefully around it. Approaching the bottom, Mordin noticed a long shadow moving between the dim rocks, and he gestured to Yan Ran to look down.

The swimming shadow seemed to be suddenly frightened, and suddenly jumped up.