Generally speaking, freediving required a diving license, but Li Du and the others were working, so a diving license was not necessary.
Max was a very responsible diving instructor. He strongly urged the four of them to get a diving license, because it was not difficult to get one. Three days would be enough.
"With my guidance, three days won't be needed. If you study hard, two days will be enough to get the license," Max told them confidently.
Just like the driving test, the diving license test in Australia was divided into several courses: theory and practice.
The two days Max said was to get the results of the theory course. The practice course would take more time, and they could pass the test while studying in the water.
That was the advantage of spending a lot of money to sign up for a class with famous instructors. Max was also the invigilator of the diving test, and he could sign their diving training sheets.
In this way, Li Du and the others did not even need to go to the certification agency for reference. As long as they combined the results of the theory course, they could get the license directly.
Although Max was young, he was very experienced in this area.
He found a cheap hotel for the four of them, which was located by the sea and had a large diving pool.
Max's purpose was to take the four of them to the theory course. When they were tired, he could take them to the pool to dive and master snorkeling and scuba diving skills.
The course was arranged in a 1 + 1 system, which was to study for an hour. Max took them to the pool to train for an hour.
This arrangement could help them save energy and time as much as possible, but it was still very physically demanding, requiring the brain and body to work together.
The diving theory course was not difficult. It was mainly based on two books: "Open Water Diver's Handbook" and "Recreational Diving Plan Instruction Manual."
The four of them were college students. Brother Wolf was considered to have graduated from college, but the university he studied at was the most famous of the four. He had dropped out of school to join the army.
Therefore, the four of them did not have much pressure to study cultural courses. It only took them a day and a half to follow Max to take the exam and pass the cultural course.
They had been learning snorkeling for the first day and a half. All four of them could snorkel, but they could only swim. In fact, except for Brother Wolf, the other three did not know any snorkeling skills or experience.
Even Brother Wolf's skills and experience were not up to standard. He had received military training in the army, which was classified as military skills. The first requirement was to complete the task.
What Max had taught them was survival skills. Survival was the first requirement in everything.
Snorkeling was the foundation of all diving. In fact, many of the skills of deep diving and freediving were derived from snorkeling.
When Li Du encountered the undercurrent, he could not control his body well. That was because his snorkeling ability was too poor. In order to pass the snorkeling test, one must first be able to swim freely in the turbulent sea.
After two days of snorkeling training, on the third day, after the exam, Max led them to start deep diving training.
Although it was just training, Max still prepared a full set of equipment and brought along an assistant who was also a veteran diver to take care of the four of them.
The initial training was still carried out in the hotel's swimming pool. The pool had an area with a depth of 40 meters.
Standing at the edge of the pool, Max explained to them, "Remember, you must first understand your equipment before you enter the water. Equipment is what you rely on to survive underwater. They are more important to you than guns to warriors."
"I've already told you about the goggles, breathing tubes, and fins when you were snorkeling. Now, I want to specifically explain the scuba system."
"During deep diving, the scuba system is the core that supports your survival in the water. It has four equipment systems integrated into a single package: a buoyancy adjustment system, a regulator, an oxygen cylinder, and a counterweight system …"
He explained the scuba system to the four of them in detail. There was an unspoken rule when choosing an oxygen cylinder, and that was that the cap of the usually used oxygen cylinder was unscrewed, so it could not be reinstalled after use.
If the cap of the cylinder had not been touched, it proved that it was a new cylinder and could be used directly.
This was already a rule in deep diving, so everyone had to remember it. They could not put the cap of the cylinder back on after using it for the sake of aesthetics.
In addition to these four survival systems, there was also a counterweight system during deep diving. This system used lead blocks to counteract the positive buoyancy produced by the body and some equipment. There was a mechanism to discard part or all of the counterweight in an emergency.
The diving suit used during deep diving was a simple diving suit. It had no life-saving ability, so when they encountered danger during deep diving, they had to quickly release the counterweight system and rely on buoyancy to escape from dangerous waters.
Max first taught them how to put on the equipment, which was easy. He then taught them how to understand the equipment, and finally, how to maintain and repair the equipment underwater.
The last stage was more troublesome, but it was a skill that had to be mastered. Otherwise, if the equipment went wrong in the deep sea and could not be restored to normal in time, it would often lead to a survival crisis.
After the equipment training was over, the next step was to go into the water.
There were generally three types of diving movements: a stride, a backward position, and a sitting position.
Max explained to them the diving movements to be used at different times and under different circumstances. These movements were not only used when entering the water from a boat. Sometimes when entering different depths of water, they also had to change their posture midway to adapt to the changes in water pressure.
Putting on the equipment, they gradually entered the water.
Sophie performed better during this period. She was like a mermaid in the water and could control her body's balance better, which was an advantage for women in diving.
When Li Du dived about 20 meters into the water, the mask suddenly began to bubble and fill with water.
This made him groan inwardly. He did not expect such an unlucky thing to happen just after training. He hurriedly indicated to Max, who was accompanying him in the water, that there was a problem.
Max, who was swimming beside Hans, did not seem to notice Li Du.
Seeing this, Li Du had to keep calm. He turned on the counterweight system to release the lead and tried to swim to the surface.
When he floated up, Brother Wolf floated up as well. Max, Hans, and Sophie followed behind.
Li Du emerged from the water and said to Brother Wolf, "You don't have to follow me. There is no danger here. You don't have to perform your bodyguard duties."
The corner of Brother Wolf's mouth twitched twice. He lowered his head and did not speak.
Hans and Sophie followed. Li Du asked curiously, "Why are you guys not training anymore?"
Max frowned at the two of them and said, "Mr. Li and Mr. Wolfgang did a good job of discovering the problem in time. You two did a terrible job of not taking my teachings to heart!"
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