The Chenghai Lake that Li Xin and the others are going to is a lake about 30 kilometers long from north to south and about 10 kilometers wide from east to west, the lake surface is very vast, the average water depth is 80 meters, and the deepest depth is about 150 meters.

The water quality in the lake is excellent, the water is clear, and the transparency reaches seven or eight meters, making it one of the best natural lakes in terms of water quality. The temperature of the lake does not change much in winter and summer, and the water quality is good, making it an excellent place for swimming, attracting thousands of people to swim in this lake every year.

It is the height of summer, and it is surrounded by mountains and rivers, which is a rare resort, so Li Xin will think of taking Jiang Xiaolan there to play.

The car pulled out of the campus and sped away towards its destination.

The laughter of several girls in the car made Li Xin very emotional: It's still good when you were a student!

Although Li Xin was not a few years older than them, those carefree days in his memory were far away from him.

Now he has a variety of charts, output, and sales data in his mind every day, and when he doesn't have a position, he can still have a little sense of ease, once he has a position, even if he wants to put it aside after closing, he can't do it, because there has always been a string in his subconscious.

This is why Li Xin often goes to climb mountains and swim alone.

Because in the reinforced concrete jungle of the city, even in the theater and café, he can't completely relax.

Only when he is in the forest, breathing the air with the smell of the forest, or plunging into the water with a "plop", and hearing no other sound in his ears except the sound of "rumbling and rumbling", will he completely forget those troubles in his mind and experience a rare sense of relaxation.

Several girls chattered for a while, and when they saw that Li Xin had not spoken, the little glasses said: "Li Xin, I heard Jiang Xiaolan say that you usually talk very funny, why don't you say a word today, so deep?"

Li Xin said, "Is it deep? No, I'm listening to you talk about those things in the school, it's very interesting." ”

Little Glasses said: "No, you can't just listen to us, punish you for telling us a joke, do you say okay?" After speaking, she also made a look of mobilizing the masses, and the other two girls echoed in unison and said: "That's it, talk about one and talk about the other." ”

Li Xin, who usually rarely tells jokes, thought about it, and said with some reluctance: "Okay, talk about one, it's not funny." ”

Little Glasses said, "It's okay, we'll listen." ”

Li Xin saw a few girls quietly waiting for him to speak from the rearview mirror, so he said: "There is a white rabbit who went fishing by the river, went to guard for a day on the first day and returned empty-handed on the second day. When it appeared by the river with perseverance on the third day, there was a "bang" in the river, and a big fish jumped out of the water, and the big fish jumped out of the water and pointed at the white rabbit and shouted: If you dare to use carrots as bait again today, I will come up and flatten you!"

A few girls laughed, and the girl named Little Cookie said, "No, no, it feels like a joke to tease children, tell another one." ”

Li Xin said with a smile: "If there is really no more, it will be this one, and I have been relying on this joke to deal with various situations, otherwise I don't know how to step down." ”

In fact, he still has a lot of jokes, but those jokes are colored, which is not suitable for the girls in front of him.

Xiao Glasses said reluctantly: "I don't believe it, Jiang Xiaolan, Li Xin will definitely have other jokes, right?"

Jiang Xiaolan glanced at Li Xin and smiled without answering.

The little cookie saw all this in his eyes and said, "Oh, have you seen it?" Lan Lan's glance is meaningful, Li Xin must have told other jokes to Lan Lan. No, no, tell us another joke that Lan Lan told!"

Li Xin hurriedly diverted the topic and said: "Actually, the joke just now was not for children, there is a profound truth in it, but you didn't pay attention to it." ”

The little glasses said, "How so?

Li Xin saw that the plan succeeded and successfully diverted their attention, so he continued: "The truth here is that people are often accustomed to thinking about problems with their own inherent thinking patterns, and rarely look at the same problem from different angles, so many times it is not that they do not communicate, but that the channel is wrong, and it is useless to talk about it." This is the case when the donkey's lips are not at the horse's mouth, and this is the case with the cow playing the harp. ”

Little Glasses said thoughtfully: "That's really the truth when you say that. ”

Jiang Xiaolan said: "Don't listen to him, he is a good teacher and likes to tell the truth." ”

Li Xin smiled and laughed at herself: "Alas, there is no way, the nature of a science and engineering man, he can analyze the profound truth with a joke, and there is no one." ”

Several people laughed and laughed, time flew by, and the road was smooth along the way, and in less than an hour, they rushed to the lake.

Li Xin drove the car directly to the door of a resort hotel near the lake, and when she got out of the car, Jiang Xiaolan whispered to Li Xin: "I live with my classmates tonight, not with you." ”

Li Xin said: "Okay, I'll keep the empty room alone. ”

After opening the room and sending the girls to the yacht with a lake view, Li Xin changed into swimming trunks, put on swimming goggles and a rubber swimming cap, and prepared to go swimming.

Before entering the water, he deliberately brought a lifebuoy and carried the strap of the lifebuoy cross-body on his shoulder.

On the shore, the afternoon sun was like fire, and it was so hot that he was sweating, but swimming in the water, the cool lake water made Li Xin feel excited, and accelerated the speed of water skiing in order to warm up his body.

Li Xin swam into the lake with the most effortless breaststroke, and through the swimming goggles and the clear lake water, you can clearly see the underwater situation.

At the beginning, the water was full of sand and gravel, and there were few aquatic plants, but when you swam to a distance of 70 or 80 meters from the shore, the lake became deeper and deeper, about 5 or 6 meters, and you could see that there were many aquatic plants at the bottom of the lake, but the aquatic plants were not high.

Li Xin's water quality is not bad, when he has time, he often goes to the swimming pool of the provincial gymnasium to swim, which is a standard swimming pool, and he can swim ten times back and forth every time he goes, about a thousand meters.

Although it is not possible to complete ten round-trips in one go, it is no problem to swim five or six hundred meters without stopping. It shouldn't be a big problem to swim out of this lake for 200 meters and then swim back, not to mention that there is still a lifebuoy tied to the strap on his body now, just 2 meters behind him.

Swimming in the lake, there is no crowded feeling in the pool, as if the entire water area belongs to you, you can play it to your heart's content, you don't have to worry about kicking others, Li Xin swims to the fullest.

More than 100 meters from the shore, the water is deeper, and when you look down, you can no longer see the bottom of the lake. However, at a depth of more than 5 meters below the surface of the water, you can see long aquatic plants growing from the bottom of the lake.

The aquatic plants swayed slowly at the bottom of the water, full of mystery.

Li Xin continued to swim, and when he came out of the water to breathe, he looked at the other side of the lake a few kilometers away, and then looked back at the shore where he had set off, and he had swam out nearly two hundred meters away.

Swim a little further, and it's time to go back, he thought to himself.

At this moment, he suddenly felt that the water of the lake here was a little different from the place where he had just swam.

The lake water is a temperature just now, but now the lake here is clearly divided into two layers, close to the water, the water that your hands and shoulders touch is warmer, and the lake water that is far away from the water, and the lake water that your feet touch is cold.

Li Xin felt very strange, looked down at the water, and couldn't help but gasp!

The aquatic plants that were faintly visible just now are now gone, and the water is pitch black, an abyss that cannot be seen!

He immediately subconsciously stopped, put his head out of the water, and the lifebuoy that followed behind him floated over and hit him on the head.

Li Xin, who was in a panic, hurriedly grabbed the lifebuoy, kept stepping on the water with both feet, and calmed down.

This position brought his feet deeper from the surface of the lake and into contact with the colder waters below the surface of the lake.

After calming down his nervous mood, Li Xin let go of the lifebuoy and turned around and swam towards the shore.

Although it was in the water, Li Xin did feel a sense of fear of heights, and the lifebuoy he grabbed in his hand just now was like a handrail, and with it, Li Xin would have a sense of security.

Otherwise, he might have panicked at that moment.

As we get closer to the shore, the lake becomes shallower and the aquatic plants at the bottom of the lake slowly reappear.

But after the fright, the leisurely aquatic plants I had seen when I came here were like tentacles of unknown creatures sticking out of the extreme cold, cruising under the water, just to get caught up in something.

Once these tentacles capture their prey, they drag it into the abyss.

Li Xin didn't dare to continue looking down, calmed his mind, and slowly swam to the shore.

After going ashore, he looked back at the lake he had just swam in, the water was as clear and clear as ever, sparkling, a beautiful scene.

If I hadn't swam in the water just now, I wouldn't have realized that there are huge risks hidden underwater.

He remembered that he had seen on TV that the cause of the formation of this lake was due to the rapid movement of the earth's crustal plates, which caused a series of faults to store water and dissolve rocks, resulting in a north-south fault collapse lake in the mountains.

Unlike man-made reservoirs, the depth of the lake is unpredictable, the edge of the lake is shallow, but on the side of the fault, like a cliff, the depth can suddenly drop by tens of meters.

What I just encountered was probably a fault, and if I panicked and caused cramps in my hands and feet, and I didn't bring a lifebuoy, if something happened at that depth, the consequences would be unimaginable.

At this time, Li Xin carefully thought about the detail that the average depth of this lake is more than 80 meters, judging from this number, this lake is estimated to be a little shallower near the edge of the lake, and three or four hundred meters from the shore, and the underwater is estimated to be the kind of fault he saw just now, otherwise, how could the average depth be so terrifying!