"Li Dongzhu, the cave entrance is big. The water is warm, it's not cold at all." A shout came from the other side.
"Not cold? Your hands are frozen outside, and you feel hot when you touch cold water. Let's go, put on the diving suit with me. "
Li Yi didn't feel warm, so he still chose to exchange for a diving suit that kept him warm.
If the temperature under the ice was really too high, there would be no ice layer above and it would melt.
However, there could be ice layers around it, like a hot spring in the snow.
Li Yi entered the car and took out five sets of diving equipment.
The diving suit prevented shark bites, but Li Yi was still worried. What if the taser gun encountered a big fish and hit him?
Guo Ziyi put on one set and gave the other three to the three Winged Knights, who were the best swimmers in the team.
The five of them were ready. A rope was first lowered so that it would be easier to pull when they came back.
At the same time, there was also a light that could shine underwater. Otherwise, they wouldn't be able to find their way back.
The five of them stood at the side of the cave. Someone lifted the gills of a big carp from the entrance of the cave.
The big carp looked to be more than 15 kilograms. It probably found that this place was brighter than other places and came to get some air.
"Jili, the chefs are making fish slices. Let's go down. "Li Yi glanced at the big fish and didn't plan to let it go.
He went down first, turned on the light, observed the surroundings, and swam for a distance.
Guo Ziyi was the second and made way.
He carried an underwater light and the five of them went down to explore the bottom.
Li Yi looked at the depth chart and slowly descended.
35 meters, the bottom.
He made a hand gesture and asked the four of them about their condition. The four of them returned a set of hand gestures, indicating that there was no problem and that they were not nervous.
He made another hand gesture, indicating that they had to disperse and come back in 30 minutes.
Guo Ziyi put down the light, and the five of them spread out with the diving light, each looking for a position.
Every ten meters underwater, there was a pressure of one atmosphere. The physical requirements were relatively high, and breathing in nitrogen was uncomfortable.
If they only went down and stayed in this position for ten seconds, the Winged Knights didn't need to wear an oxygen tank.
Powerful freedivers could take the initiative to exhale air when they reached the depth of pressure and complete the decompression operation during the rapid ascent.
In any case, Li Yi wouldn't know how to do it, but he guessed that Guo Ziyi would be able to learn it.
Li Yi swam and observed the surrounding situation. He confirmed that it was an underground lake. The thermometer showed that it was eight degrees above zero. It was a hot spring.
As for why he did not discover it at that time, it was probably because of the geological changes that caused it to disappear.
However, there was a hot spring and the water temperature was not low. This place would belong to Lingbao City in the future, a county-level city.
The current Eight Degrees was obviously not suitable for hot springs, not even in summer.
They needed to take a sample of the water and test it to see the composition of the water.
It was high in minerals and was not harmful to the human body. It could be drunk and watered even more.
The royal family had a hot spring planting area and a field watered with hot spring water. The cucumbers grown there tasted better than those grown in greenhouses.
"Black fish. According to what they said, there should be a big black fish over two meters long. How many years has it been growing?"
Li Yi muttered. He wanted to find a big carnivorous fish and kill it.
Only then would it be stable on the surface of the water. It would be safer for people to play, but it was unrealistic to raise fish.
The seedlings were all drilled into the underground lake.
The underground lake was also connected to the underground waterway. God knows where it would lead to.
However, they could make the mouth a little bigger and then put down the net to catch the fish.
There should be a lot of fish in the underground lake and the underground waterway, naturally breeding.
If it were not for the black fish, there would probably be a lot of other fish.
They thought that fishing would replace the black fish and help the number of fish in the underground lake to maintain the balance.
Li Yi thought about how to make better use of the hot spring while swimming. It would be convenient if he could find the water outlet.
Make a big net at the water outlet to prevent the fish from going out. They would stay in the underground lake and throw things down to feed the fish.
Catch as many carnivorous fish as possible. When the other fish grow up, they would go up to live in the summer. Fishing.
When fishing, use a big hole net and leave the other small fish.
The water at Eight Degrees Celsius in winter could be used in the surrounding vegetable greenhouses after the water pipe was insulated.
It was not a problem to lead it to the livestock trough. Poultry and livestock all needed to be replenished with minerals.
"Find a place to make a pressure well and let the people eat the pressure water. It would be best if it was weak alkaline. Let's see the test data."
Li Yi muttered again. He thought of many ways to use the underground low-temperature hot spring to help the local development.
He came in person to develop the local economy and take Li Longji and the others to sightsee.
He also wanted to go out for a walk. It was annoying to stay in the Li Family Zhuangzi all day.
Li Yi, who was looking for the black fish and wanted to electrocute them, continued to swim. The visibility underwater was not far.
As he swam, he found a "wall" in front of him. There were holes of various sizes on the wall.
It seemed that they were formed naturally and not artificially.
He swam along the wall. The big holes were about one meter in diameter and could easily swim in.
He could not see if the small holes were permeable or not. He did not dare to go in. He did not dare to go in any of them.
"Natural weathering? Water erosion? So it was weathered on the surface and then sank? "
Li Yi was analyzing the formation of these holes and where the holes were connected. He did not intend to explore today.
After swimming for more than 20 minutes, Li Yi began to "run" back in a straight line. It was almost time. He did not encounter any big black fish, but he did not regret it.
He planned to stay here for a few days. Anyway, he would go back to Chang 'an before the New Year.
When he returned to the rendezvous point, the other three people had also returned.
There were still three minutes left before the half-hour deadline. The three Winged Knights did not want to take the risk.
This was not a war where they had to risk their lives. After swimming one round and understanding the situation, they had to act according to orders. There was no need for individual heroism here.
Li Yi looked at his watch. It was almost half an hour, and Guo Ziyi had not returned to the team.
Li Yi gestured to the three people, indicating that they should not be anxious.
If they were anxious, their oxygen consumption would increase. If they could not handle it, they should go up first and change their oxygen and nitrogen cylinders.
Once or twice, it would not affect their health.
After half an hour, Li Yi gestured again. There were only five minutes left.
The three people also looked at their watches. They felt that time was passing so fast. It was as if the second hand was ticking.
They hoped that it would slow down a bit and wait for Guo Ziyi to come back.
They were not allowed to look for Guo Ziyi now. It was discipline.
Li Yi looked calm. He had confidence in Guo Ziyi. How could Wu Juyi and the others have any problems down there?
Four and a half minutes had passed. It was almost five minutes. Everyone was going to go up.
A spot of light appeared in the water. The three Winged Knights smiled. No one could see it.
Sure enough, the spot of light gradually became bigger and started to dazzle their eyes.
Guo Ziyi came back with a big fish that was even longer than his body.
The three Winged Knights went up. Li Yi picked up the lantern on the ground, shook it, and swam up first.
When they reached a depth of 20 meters, he stopped. Guo Ziyi and the other three people with the big fish also stopped.
After about two minutes, they swam up again and stopped at a depth of 10 meters.
After a minute, Li Yi went up first with the rope. He said, "Quick, prepare a big net. No, tie a thick rope with a stick."
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