He handed the clothes to Lu Zhizi and assembled the air supply regulator, nozzle, and air cylinder.

He used to buy all the good products. This air supply regulator supplies air on demand and has a primary and secondary depressurizer. Air is only supplied when the diver needs it, so there is no waste of exhaled air.

Lu Zhizi put on a tight-fitting wetsuit, which accentuated her slender figure.

She picked up the earplugs, intending to put them on, but Lu Wuyai grabbed her wrist and shook his head: "Don't use them. Although these things can prevent water from entering the ear canal, they will disrupt the pressure balance inside and outside the eardrum and damage the middle ear."

"Goggles are also unnecessary. Goggles cannot cover the nose, nor can they adjust their internal pressure according to changes in water depth. In this case, the surrounding water pressure could easily push the frames into the skin, causing some tissue damage."

Lu Wuyai was taken aback and said, "Is it really that serious? I never cared about diving before."

Lu Wuyai said, "Once or twice is fine, but I'm afraid you'll be diving too often in the future, and too many times won't be good. In short, diving operations don't need extra equipment; they do more harm than good."

In order, he helped Lu Wuyai put on his diving suit, diving boots and hood, ankle diving knife, life jacket, waist diving knife, scuba diving device, watch, extensometer, gloves and flippers.

Lu Zhizi laughed and said, "As for wearing so many things, and carrying so many knives, is he going to go diving to fight?"

Lu Wuyai said, "Just in case, don't move. Let me check."

First, he checked the gas cylinder. After testing the tightness of the gas valve, he placed the gas supply regulator on the gas cylinder's switch valve, opened it, turned it upside down a quarter turn, and listened carefully to the sound of gas being released.

He checked the life jackets behind him, inflated them to make sure there were no leaks, then let go and nodded, saying, "Almost there."

Lu Zhizi rolled her eyes: "My God, this is too much trouble."

Lu Wuyai said seriously, "Going into the water may require deep diving, and no amount of preparation is too much."

Seeing his serious expression, Lu Wuyai pursed his lips and smiled, "Yes, Teacher Li."

Lu Wuyai laughed too. He patted Lu Zhizi's face and said, "Study hard. Teacher Li will teach you well. Come on, get in the water."

He cradled the purple deer by the back of his neck, like a mother cat cradling her kittens in her mouth. The fawn, clutching the Purple Queen, fell into the water. He released her, letting her go into the water, and then dived down with her.

After diving into the water, she surfaced again and pushed off her mask: "Don't wear a wetsuit."

Lu Wuyai said, "There's only one set, how am I supposed to wear it?"

Lu Wuyai said worriedly, "Forget it, don't come down with me."

Lu Wuyai laughed and said, "Alright, don't worry, you can dive now without worry. My abilities are beyond your imagination. Today I'll let you experience the old sea devil's abilities."

"Old tortoise," Lu Wuyai said weakly, "Isn't it better for you to compare yourself to yourself like this?"

“It’s a sea monster, not a turtle.” Lu Wuyai pulled off her mask, took her hand, and began to dive.

Once the preparations are complete, diving is not a big problem.

The weather on the ground was hot in July, but the lake water was warm and comfortable.

Diving can be addictive, especially in the hot summer. Lu Wuyai jumped from the boat into the water, and the warm, soft lake water immediately enveloped him, quickly taking away the heat from his body.

The lake water was clear, and after entering the water, several palm-sized crucian carp scattered all over the ground. They swam away, tails wagging. After a while, they curiously swam back to take a look.

Lu Wuyai tried to reach out and touch them, but it was impossible; the crucian carp immediately swam away.

Lu Wuyai took her swimming in the shallow water for a while. To reduce suspicion, he wore an open-mouth breathing apparatus and had a tube in his mouth with the other end of the tube protruding above the water.

He looked at Lu Zhizi's breathing rate, shook his head, led her to the surface of the water, took off his mask and said, "I really don't know how you learned to dive before. You can't take short breaths, but you should breathe by jumping, you should know how to breathe by jumping."

Lu Wuyai nodded and said, "I know."

“Very good.” Lu Wuyai took her into the water again. As soon as they entered the water, Lu Wuyai vigorously shook his long legs and sprinted forward, pulling his hands back like a toad.

Lu Wuyai was stunned. After she jumped a few times like that, he surfaced again and asked, "What are you doing? Breaststroke. But breaststroke isn't like this."

"Didn't you tell me to jump up and breathe? Didn't I jump?" Lu Wuyai's face was full of innocence.

Lu Wuyai laughed angrily: "You don't know whether 'jumping breath' or not. It's not your body that's jumping, it's your respiratory organs that's jumping. After inhaling air, hold your breath for about two seconds."

"In this way, firstly, it can improve oxygen utilization, and secondly, it can increase the content of carbon dioxide in the body, allowing them to stimulate receptors in the blood vessels of the brain and avoid causing headaches."

Lu Wuyai murmured, "Is it that special? But in the water, it's so tense, I don't care about how I breathe. If you have oxygen, you can't breathe."

Lu Wuyai couldn't take it anymore. He put a mask on her and pushed her head into the water: "Oh no, teacher, this job is really difficult."

After swimming in the lake, Gu Yuxin and Lu Wuyai slowly submerged into the water.

Soon, Lu Wuyai frowned.

Lu Wuyai knew what was going on. When diving, the increased water pressure caused the ear to lose its balance. The gradually increasing air pressure would slowly push the eardrum into the ear, causing discomfort.

If you force yourself to descend, it could have serious consequences, such as a ruptured eardrum. There is an ethnic group in Nanyang called the Bayao.

Lu Wuyai observed Lu Wuyai's expression and, seeing her frowning, pulled her back from the water, saying, "Your ears are uncomfortable. I'll teach you two methods. The first is called the Valsalva movement; pinch your nose and try to slowly blow air out..."

Lu Wuyai took a dozen breaths, nodded and smiled, "I feel much better now."

Lu Wuyai nodded: "Alright, I'll teach you the Tomby technique again. Block your nostrils with your fingers, then make a swallowing motion. This will open your throat, and the movement of your tongue will send air into your trachea, maintaining a balance of internal and external pressure. You can use these two methods to adjust the pressure in your ear canals and airway when you feel uncomfortable while diving in the future."

Lu Wuyai looked at him with admiration and said, "You've already become a diving instructor, why do you know so much?"

Lu Wuyai calmly shook his head: "Isn't this going too far?"

That's really not much. He's already searched a lot of things on Baidu these past two days, but unfortunately, he doesn't have a photographic memory; he only remembers this much for now...

At the opportune moment, Lu Wuyai gave him an admiring look: "Of course, you've learned a lot."

Lu Wuyai raised his head and said, "I'm not being modest, these are really basic methods. Did your diving instructor ever slaughter pigs before? I don't understand."

Lu Wuyai said, "I don't have a diving instructor."

Lu Wuyai asked in confusion, "Didn't you say you were learning to scuba dive in Miami?"

Lu Zhizi: "Study on your own."

Lu Wuyai gave a thumbs-up, exuding domineering confidence. "Great stroke. You're awesome. Three strikes, fatal."

This time I went diving again, and everything went much more smoothly.

After several ups and downs, Lu Wuyai learned very quickly. With the help of the submersible, she was soon able to dive to a depth of ten or twenty meters.

At this depth, the sunlight is still bright; the summer sun is very strong and can easily penetrate forty or fifty meters. Of course, we cannot expect the same brightness underwater as on land.

Aquatic plants swayed at the bottom of the lake, and freshwater fish darted in and out. When you removed the aquatic plants, you could see snow-white sand. In some places, stones of various sizes were scattered here and there. Lu Zhizi found some water snails on a stone and immediately became happy.

After a while, Lu Wuyai surfaced to catch his breath. He couldn't let Lu Wuyai notice anything amiss.

And so, Lu Wuyai kept searching for water snails for him, asking him to bring them onto the boat.

There are fish and shrimp in the lake, but you can't catch them with your hands, so water snails and river clams become Lu Wuyai's targets.

After collecting some snails and clams, Lü Zhizi's interest waned, and his enthusiasm for diving also diminished.

Lu Wuyai smiled, walked over, took her hand, led her swimming for a while, and then continued diving.

As they went further down, the water became deeper and the light became even dimmer. Lü Zhizi wanted to turn on the headlights, but Lu Wuyai stopped her, shaking his head to indicate that she shouldn't do so.

After he took a few breaths, a seemingly dazed column appeared before them.

At this moment, Lu Wuyai swam above Lu Wuyai and turned on the large light for her. In an instant, the halogen lamp shone a broad, yellow, giant sword, and within its range, towering trees were everywhere.

Yes, trees have appeared at the bottom of the lake, and this seemingly indistinct pillar is actually a forest.

I saw trees, both tall and short, rooted in the lakebed. Their bark was dark brown, their branches short and sparse, but covered in green, and parts of their trunks were also green, as if they were growing underwater.

Some carp and crucian carp swam among the fish, and occasionally silver carp and bighead carp could be seen. Lu Wuyai sank into the water, stirring the lake bottom, and suddenly, a large catfish emerged...

Lu Wuyai was taken aback. She was very knowledgeable and knew that some trees could survive in water, such as dawn redwood and tamarisk.

But these trees are only rooted in the water, unlike this forest, which is underwater, and in such a deep lake, it's nothing short of a miracle.

Lu Wuyai told her to look at the forest by herself and float up to catch her breath, but he didn't actually surface. There would be lights to guide him, and he could monitor Lu Wuyai's line of sight.

The headlight was fixed to Lu Wuyai's forehead. If she turned her head or raised her head, the angle and position of the light would change.

Looking down from above, Lu Wuyai saw a group of noodlefish. These fish were as thin as chopsticks, almost transparent, and they were a wonderful type of freshwater fish.

In addition, there are saltwater noodlefish species, but their taste and nutritional content are not as good as freshwater fish.

Lu Wuyai regretted not bringing a fishing net, otherwise he could have fished it out for dinner.

Lü Zhizi also noticed the group of doughfish, and she slowly reached out her hand. The fish thought she was also a tree at the bottom of the lake, so they weren't afraid and slowly walked past her.

The scene was beautiful, and Lu Wuyai regretted it again. He really wanted an underwater camera. Taking photos like this would be wonderful.

Lu Zhizi watched with delight as Xiaoyuer walked past him, but suddenly, Xiaoyuer panicked and disappeared without a trace.

Just as she was wondering what was going on, a dark shadow fell down from above, grabbed her from behind, and moved several meters across the water, one hand still groping around her waist.

Lu Zhizi was startled. She quickly turned around and saw Lu Wuyai hugging her from behind.

This made her heart sink; what exactly was he going to do?

Lu Wuyai held her, turning to the side while rubbing her waist with his hand. Then he pushed her away, raised his arm, and the yellow light shone on it, making the sharp knife in his hand gleam coldly.

Besides the knife, the light also illuminated a fish. Upon closer inspection, Lu Wuyai discovered that the fish was quite large, about one and a half meters long, and shaped like a fish.

Its body is long and pointed, its head is long and pointed, and its mouth is also long and pointed. Compared to this, its scales and fins are also very small. Its entire body is silvery-white, except for a slightly grayish-brown back.

This was the first time Lu Zhizi had ever seen such a large fish in person, a fish that could grow so big even in freshwater.

The giant fish was incredibly fast and extremely arrogant. After it appeared, it darted around rapidly, showing no fear of Lu Wuyai and his companions, swimming freely around them.

From very close range, Lu Wuyai saw the sharp teeth in the fish's open mouth, like those of a shark.

In the instant the big fish swam past him, Lu Wuyai suddenly swung his arm, and the throwing knife slashed across, leaving a wound on the fish.

Immediately, the fish's blood flowed out.

This large fish wasn't as ferocious as a shark. After being injured, it wagged its tail and quickly disappeared.

Seeing this, Lu Wuyai took Lu Wuyai's hand and led her slowly upwards, completing the descent in three stages before returning to the surface.

After surfacing, Lu Wuyai removed his mask and exclaimed in surprise, "What kind of fish is that? It's huge and looks ferocious. Luckily, we brought a diving knife."

"I thought it would be difficult to go down with a diving knife. He even laughed at my cowardice, saying that this was diving, not fighting," Lu Wuyai joked.

Lu Wuyai felt embarrassed and lightly punched him: "Tell me quickly, what kind of fish is this?"

Lu Wuyai said with a smile, "Water tiger, scientifically known as scorpionfish. I didn't expect there to be such a big water tiger in Longsha. I haven't seen one in many years."

Lu Wuyai suddenly realized: "So this is a carp. It's very fierce, isn't it?"

Lu Wuyai nodded. Encountering a water tiger while diving was something he hadn't expected.

He knew there were carp in Longyanxiang Lake, but carp mainly lived in the middle and upper layers of rivers, lakes and seas, and rarely went to the bottom of the lake.

Furthermore, Lu Wuyai is correct; these fish are extremely ferocious. They swim and move very quickly, and are large carnivorous fish. Due to their ferocious nature and strong swimming ability, they frequently attack and prey on other fish, and may also attack chickens, ducks, geese, and humans.

Especially when they encounter fish that are over a meter long, it is very dangerous for children and they may bite the children's hands and feet.

But this carp wasn't coming for people; it must have been attracted by the group of noodlefish, otherwise it wouldn't have escaped so easily after being stabbed.

Lu Wuyai handed the diving knife to Lu Zhizi, helped her onto the boat with his arm around her slender waist, and said, "The situation was urgent just now, I'm sorry, I didn't mean to hug you."

Lu Wuyai said, "Weren't you hugging me?"

Upon hearing this, Lu Wuyai immediately released his hands and said, "Oh, I'm sorry, you can climb up yourself."

As soon as Lu Wuyai boarded the ship, she was hanging from the ship's side as soon as he let go. She was both ashamed and angry: "Hurry up, help me up!"

Lu Wuyai laughed heartily, grabbed her long legs, and used all his strength to send her onto the sand barge.

After resting for a while, Lu Wuyai thought of the forest at the bottom of the lake: "My God, I was stunned just now. I didn't even look closely. How could there be a forest at the bottom of the lake? I'm not wrong, I'm right."

Lu Wuyai said, "That's right, it's a forest at the bottom of the lake."

Lu Wuyai was taken aback and said, "How is that possible? Trees need photosynthesis to survive, but there is no light to support the survival of trees at the bottom of a lake tens of meters deep."

Lu Wuyai didn't care at all and answered directly, "They're not living trees, they're dead trees. Do you know what an underwater forest is? It's pretty much the same on both sides."

Lu Wuyai was indeed knowledgeable and immediately said, "How could that be? Underwater forests are ancient forests that survived on the seabed after the sea submerged the land, and they grow in a primitive, upright state. They are all dead trees, while the trees at the bottom of the lake clearly have green leaves."

Lu Wuyai laughed and said, "Haha, you're mistaken. Those aren't leaves, but some aquatic plants wrapped around them, and some aquatic plants attached to them. In short, they are indeed dead trees."

Lu Wuyai pondered for a moment, then couldn't help but sigh, "Nature is truly amazing."

Lu Wuyai said, "This is not the work of nature, but a miracle. Do you know the origin of the name 'Dragon Saliva Lake'? These trees at the bottom of the lake prove that the name is not nonsense. In the past, this place was a small basin. Perhaps a dragon really did spew out immortal water and submerge the land in the lake."

Lu Wuyai smiled and said, "Really. Maybe so, but there are other guesses, scientific guesses. Would you like to hear them?"

"Go on," Lu Wuyai said, adopting an attentive listening posture.

Lu Wuyai said, "Since the end of the last Pleistocene, the world's climate has gradually warmed. Ice and snow have melted, and sea levels have risen. In the past 10,000 years, sea levels have risen by several hundred meters. This lake may be a result of the rising sea levels."

“But this is a freshwater lake,” Lu Wuyai said with a smile.

Lu Wuyai thought for a while and said, "Then let me make another speculation: the local crustal movement relative to the ground, such as an earthquake, caused the ground to sink, and the groundwater submerged the forest, forming a landmass. That's what Forest Lake is today."

Lu Wuyai nodded: "That's possible, but will the earthquake only affect such a small area?"

Lu Wuyai nodded and said, "Yes, the scale of local crustal subsidence is related to the tectonic activity of the earth's crust, and the area is generally not too large. This underwater forest is very beautiful and interesting. I want to dive down and take a look later."