Everyone governs the country and the army every day, and they themselves forget for a moment that the three of them live in an isolated world.

The outside world has changed dramatically, and after Wu Rui and Wang Li returned to the barracks, General Wang Jian led a large army to easily clean up the Wuyue tribe. According to Mei Juan's arrangement, the blue wolf led the tribesmen to continue to move south to Hunan and Jiangxi, and the Qin soldiers successfully unified the Wuyue region.

Although Wu Rui disagreed with Zhao Tuo, he still trusted Li Tangshan's feelings very much. The two of them led a carpet search within a radius of 300 miles from Daming Mountain, but the results disappointed them. Li Tangshan and Mei Juan are in the same air, and there is no news of them at all.

Huang Shigong said to Li Tangshan and Mei Juan: "Little brother, it's time for you two to leave here, you have been here for too long." I do have a way to leave. There's an underground river that leads to the outside, and there's a section of the river where you have to dive to get out. ”

Li Tangshan asked: "Senior, how long does it take to dive that section of the river before it comes out?" ”

Huang Shigong said: "I will also need a pillar of incense at the earliest. ”

Li Tangshan calculated and said: "The maximum limit of breath-holding diving time is 13 minutes, and the minimum time of a pillar of incense is 20-30 minutes." Ordinary people can't stand it even for a minute, but people like us who practice martial arts may be able to dive for 5-6 minutes, which is very powerful, and there is no other way for the seniors. ”

Huang Shigong nodded after listening to Li Tangshan's analysis and said: "Haha, young man, you have no problem with learning Qigong, if you study well, there is no problem with the time of one pillar of incense and two pillars of incense?" ”

Mei Juan said happily: "It's great that we can finally appear like this!" Thank you, seniors! ”

Li Tangshan asked Huang Shigong: "Is it easy to learn the closed qigong of the seniors?" How long does it take? ”

Huang Shigong thought about it and said: "If it is fast, it will take three years, and if it is slow, it should be able to learn in ten years." ”

When Mei Juan heard that it would take three years to go out, she was depressed again.

Li Tangshan said: "Three years is too long, and the babies have been born. Is there a crash course? The kind that can be learned with a pillar of incense. ”

Huang Shigong shook his head: "Nonsense, if you learn martial arts, you can learn it like you said!" Haste makes waste. ”

Mei Juan glared at Li Tangshan. Jiao Didi blushed and said, "Li Tangshan, what nonsense are you talking about." ”

Li Tangshan ignored Mei Juan and continued to discuss with Huang Shigong what to do. Li Tangshan said to Huang Shigong: "Senior, there is a sport in my hometown called cave diving, which is considered one of the most dangerous sports in the world. If we can make these devices, we'll get out easily. ”

Huang Shigong asked, "What kind of equipment is it?" ”

Li Tangshan explained: "Underwater thrusters, closed rebreathers, etc., the most important thing is the breathing apparatus, and the respirator is not necessarily safe, unlike the ground, the underwater high-pressure environment - including a standard atmosphere pressure brought by the atmosphere, and an additional atmospheric pressure per 10 meters of water depth, will make the human body's response to breathing gas completely different." It may also cause convulsions due to acute oxygen toxicity. ”

Huang Shigong shook his head and said he didn't understand.

Li Tangshan and Huangshi Gongren popularized science: "What we breathe is air, we can't see it, we can't touch it." We can feel his presence. In addition to helium, nitrogen, oxygen, exhaled carbon dioxide exhaust gas, our scientists have found that if the proportion of any kind of gas cannot be well matched with the current depth pressure and the diver's own physical characteristics, it is very likely to lead to a serious decline in the diver's thinking ability (manifested as stupidity and unconscious), and even acute convulsions and coma. ”

Huang Shigong and Mei Juan finally understood what Li Tangshan was saying.

Li Tangshan said: "There is no way to compare our diving ability with our predecessors, there are more branches of underground rivers, and it is very easy to drown in it if we go the wrong way, so our predecessors prepare a guide rope for us, and Mei Juan and I can practice the basic diving skills first." ”

Huang Shigong led Li Tangshan and Mei Juan along the stream, continued to flow down the canyon depths, stepped on the big stone in the stream, listened to the stream flowing at the feet, tired to find a stone to sit down, listening to the stream's cheerful singing, Li Tangshan thirsty a handful of stream water, the stream water is clear and sweet, a pinch of the entrance, suddenly a clear into the heart, there is a kind of pure soul cleansing soul of the thorough feeling, the clear stream reflects the green mountains, reflecting the blue sky, very beautiful. The stream flows quietly every day like a quiet girl, accompanied by the undulating mountains, accompanied by kind and simple people, forming a beautiful picture.

Li Tangshan admired: "Daming Mountain is so beautiful! ”

Mei Juan took Li Tangshan's hand and enjoyed the beautiful scenery in the valley.

Li Tangshan looked at the crystal clear water of the creek, and there were some small fish playing in the water! In the emerald green bamboo forest valley, hundreds of birds chirp, and the bright sunlight shines on the stream, and the stream is sparkling, as if a layer of diamonds has been sprinkled on the water surface. The stream was babbling. A stone blocked their path, and water flowed over it, splashing small white splashes. The small splashes are crystal clear, fall into the stream, have many dimples, and swirl in the water.

Li Tangshan pointed to the bamboo forest in the valley and said, "I have a way to make an oxygen supply system!" ”

Huang Shigong and Mei Juan are used to Li Tangshan's crazy words, and it is understandable that Li Tangshan can say any amazing words.

At the end of the creek is a small lake, the water of the lake is blue, so quiet! It's so quiet that you can't see it flowing, and when the breeze blows, the layers of water waves, like wrinkled clusters, are evenly spread on the surface of the lake. The blue water of the lake reflects the snow-white clouds, and the bulging waves kiss the shadows of the flowing clouds, which are very bright and bright. The clouds, the water, the day, the waves, and the gentle breeze make a beautiful scenery that makes people feel refreshed and happy.

Li Tangshan and the others didn't have the heart to enjoy the beautiful scenery in front of them, so Huang Shigong designated a cave under the cliff on the other side of the lake and said, "Below that side is the above-ground river that leads to the outside." ”

Li Tangshan nodded and said to Huang Shigong: "Senior, it's getting late now, I'll come over tomorrow to have a look!" ”

The next day, Li Tangshan got up too early, and pulled Mei Juan out, the hills in the distance were high and low, undulating and continuous, in the misty clouds and smoke, flickering far and near, if they were about to leave. The beauty of the mountain lies in the majestic and towering, steep and upright, the cliffs and cliffs, and the overlapping peaks; It lies in the cloudy treetops, the fog stream valley, the green forest and the wind, and the white water stream; On the verdant grass and trees, the good birds chirp each other, the glimmer of light in the morning light, the glimmer of light in the twilight.

Li Tangshan asked Mei Juan to cut a lot of bamboo, and Li Tangshan made a lot of thin strips from the mountains. Mei Juan treated the bamboo according to Li Tangshan's requirements, and after processing, she threw it directly into the creek and floated down the stream to the small lake.