As the diving course progressed, Tang Wen was disappointed to find that he wanted to swim around alone in the water freely, and look for his dolphins by the way. Pen, fun, pavilion www. biquge。 info is almost impossible.

"The dive guide will follow you, usually right behind you... Don't panic at the bottom of the sea, always remember to breathe through your mouth! Dive buddies and everyone form a diving buddy in pairs, and when the buddy disappears, you don't do anything, just wait where you are for a minute! If he doesn't show up after two minutes, immediately go up to the surface and call for help. This is very important and determines the life and death of many people......" Tang Wen always felt that when Coach Liu talked about this, he always deliberately stared at himself twice.

“... Okay, let's start checking our gear and get ready to dive..."

The diving suits were almost all black, and Bai Qing and Nangong Caiwei were reluctant to bite into their mouths with the scuba used by others, so they simply bought a new set with Tang Wen.

Everything from tanks to snorkel suits, regulators, and dive computers are available.

Tang Wen deliberately bought a large diving knife, the blade of which was eighteen centimeters long, even though this thing was almost useless in the sea.

Coincidentally, there were seven of them in this group of students, and Tang Wen stood at the end of the line, and there was no surprise that he had a bye.

However, Coach Liu also put on his equipment at this time, and said to him with a smile: "We are in a group, I will watch you!"

Tang Wen shrugged, and the two of them relaxed their bodies with their backs to the sea and entered the water backwards.

Thanks to the natural pollution-free nature of the South China Sea, the visibility of the seabed is about 30 meters.

When the computer screen on the wrist showed that the depth was only three meters, a large school of fish appeared.

The two of them dived slowly, and the school of fish ran to their heads, changing shapes and swimming around. Coach Liu swam out from behind Tang Wen, stretched out two fingers to point to her eyes, motioning for him to look, and then she pounced on the fish herself.

The timid fish flickered and changed formation to dodge. Tang Wen spit out a large string of bubbles in his mouth in surprise, and also found a group of small fish with yellow stripes on their bodies and pounced. Watching the fish dodge in an uproar made him feel a sense of guilt after successfully bullying the child.

Of course, there is no sound on the bottom of the sea, and there is no sound when the fish swim. When I first came down, I could still hear some movement on the sea. But a little down, there is silence. The whole world lost its voice in an instant, only the sound of its own breathing...

The first few times he tried to get down the rope, Tang Wen only cared about showing his swimming skills, and he didn't feel it at all. Now I don't think about it so much, and I can experience the wonder of the ocean at once.

He suddenly remembered the origin of species, and said that all animals on land crawled out of the sea. Even if this argument was very reasonable before, his previous acceptance in his heart was not very high, and it should be said that he was relatively insensitive. But now that my whole body is soaked in water, I roll a few times, and there is indeed an indescribable comfortable feeling that seems to return to the mother's body.

Coach Liu came over and pulled him, waved at him, and warned him not to do the more dangerous maneuvers of rolling.

With the help of the gravity of the lead block, the two came to the bottom of the sea at a depth of more than twenty meters. Generally speaking, about ten meters is the critical point of positive and negative buoyancy. In other words, diving depths within 10 meters generally do not need to carry lead blocks. Further down, it's best to bring it, otherwise it will be difficult to dive.

The underwater world is a bright blue, and Tang Wen thought about it for a long time in the water and didn't think of any good adjectives. The first thing that popped into his mind was the color of the Bordeaux solution he had learned in chemistry in middle school. From the bottom of the sea, as far as the eye can see, there is a sparkling blue. The closer you get to the sea, the brighter the color.

Tang Wen stood on the undersea beach and looked up for a while, and a small flower fish swam over, waving its tail in front of him, as if he was very interested in his shape. The one who stretched out his finger to poke it, the little fish felt the slight change in the current caused by this action, and suddenly flicked its tail to dodge.

The bottom of the sea is full of fish and corals, rich in color, black and white, yellow-brown, purple-red...... The fish are also strangely shaped, somewhat camouflaged, and there is no flaw in the coral reef lying below. If it weren't for its white and translucent thick lips betraying it. I can't find it at all.

The gas in a small six-liter cylinder can only last for half an hour in a water depth of about 10 meters. And Tang Wen's location is more than twice as deep as ten meters, and the consumption is even greater. After all, the bottle is filled with air, not oxygen.

When he took a diving class, Tang Wen also learned a new term: hyperbaric oxygen poisoning. It is said that continuous breathing of high-pressure oxygen for a period of time will cause great harm to the lungs and cells throughout the body, such as accelerating cell aging, convulsions, convulsions and other manifestations.

Twenty minutes passed in a flash, and the two of them swam up together.

The underwater world was so attractive to him that he didn't even notice that Bai Qing and Nangong Caiwei had already surfaced.

Nangong Caiwei took off her cylinder and mask, and sat on the deck drinking mineral water. The face is a little pale.

"What's going on?" Tang Wen looked at Bai Qing with a worried expression.

Bai Qing frowned, and her voice was a little uncertain: "Well, the coach said that Cai Wei is dizzy..."

"Fainting?" Tang Wen shook his eyebrows and said with a smile: "What kind of egg is a faint egg?

"Sister, I'm dizzy, stinky boy! You didn't listen well when I saw the lecture..."Nangong Caiwei came to her senses and glanced at him unpleasantly.

Tang Wen looked at Coach Liu and was puzzled: "Doesn't it mean that the water pressure above 30 meters is generally the only way to get dizzy?"

Coach Liu wiped his hair and said with a smile: "This varies from person to person. Thirty meters or more is for most people. Everyone's physique is different, just like drinking, some people pour a glass of beer, and some people drink a good amount of alcohol. Thirty meters is the limit of the feeling of dizziness for ordinary people... But don't worry too much, after the nitrogen drunkenness, just float up. Generally not dangerous..."

"Hehe, can't you dive deep in the future?" Tang Wen looked at Nangong Caiwei with a smile.

"I wasn't going to dive anymore. The sun doesn't shine in the deep waters, and it's pitch black everywhere, it's so scary! Nangong Caiwei didn't care.

"There are people abroad who have summed up the feeling of nitrogen drunkenness, saying that they want to drink a martini at 30 meters, and they want to drink two cups ...... at 40 meters," Coach Liu said to them with a smile.

"Do you get dizzy?" they took a course that didn't involve deep diving.

Coach Liu put away his smiling face and nodded very seriously: "Yes, don't talk about Xiang Caiwei's intolerant physique, even an ordinary person who is a little stronger, when he reaches sixty or seventy meters, he will be so drunk that he almost loses his judgment...... Of course, don't worry too much, sixty or seventy meters is a depth that is difficult to dive. You can't get out of the water and be in that deep ...... very quickly. So you have to dive slowly, especially for those of you freedivers. ”

In the afternoon, when the 12-liter cylinder was changed and then launched, it became a group of Tang Wen and Bai Qing, and Coach Liu took Nangong Caiwei. The location has also been changed from the east side of the island to the south side. The scenery below is still a little different, there is a drop in the depth here, the depth is from more than ten meters shallow to more than forty meters deep, Bai Qing took an underwater camera everywhere to shoot the fish and corals at the bottom of the water.

After playing for a while, she was still not happy, gesticulating, and constantly commanding this Tang Wen to take pictures of her. The two of them swam a little out of the group, and the sight underwater is naturally much worse than on land, and people can only vaguely see the outline from a distance.

Suddenly, Bai Qing, who was comparing to the scissorhands, suddenly widened his eyes and spit out a large number of bubbles in his mouth. At first, the palm of the hand kept wiping the neck. The other pointed behind Tang Wen...