After kicking the strange fish back to the underground river, Bi Fang hurriedly moved to the river beach to avoid being attacked by the strange fish again.

The river flows quietly, and the fish swim in circles in the water, forming whirlpools of light that are dazzling. These fish are actually glowing!

Fluorescence can even allow Bi Fang to see this majestic place clearly!

What an incredible miracle of life!

Is this intracellular or extracellular luminescence?

Why is it so bright?

The phenomenon of bioluminescence is not uncommon, and the most famous one is the firefly on land.

There are so many luminous fish schools in an underground river. What kind of species are these?

Gu Qingyuan had already fallen into deep thought, while Wu Gang on the side did not have so many twists and turns. He was simply immersed in such a vast and unknown underground.

So exciting!

The moment he looked around, Bifang forgot the danger just now, but felt the urge to kneel down and worship.

He had never thought that there could be such a vast underground space in the world, maybe hundreds of feet, maybe thousands of feet.

He could not measure this huge cave with his own eyesight. When he stood up and looked out, the end of the underground river was hidden in the darkness, and it was impossible to see where it flowed.

The sound of dripping water echoed monotonously in this huge space. The rather wide underground river meandered like a river in this world. The stalactites accumulated over thousands of years are the mountains here.

The sound of water stirring suddenly sounded, and a large light fish that Bi Fang had seen before suddenly jumped out of the river!

It seemed to have been diving deep for a long time, and now it was shining brightly. As the only source of light in the darkness, it was so bright that it was even dazzling.

Bi Fang narrowed his eyes and took a step back, but tripped on a stone behind his feet and almost fell down.

【Oh my god, isn’t it too big here?】

【Is there such a big cave? We just dived more than 20 meters, right? 】

[Brother, have you forgotten that this is a valley? I estimate that this place is probably more than sixty meters above the ground...]

[I will never go to Jiaofangsi again and give it to the anchor Big Bone*1 - Praising Nature]

[messier64 presented fish balls*10,000 to the anchor—crossing the ocean and finally seeing land, it’s so beautiful.]

Compared to everyone's emotions, Gu Qingyuan was not so shocked by the vastness of this world, or he had expected it.

"As I guessed, whales can only breed in the sea, and big fish cannot be raised in fish tanks! If you want to raise a three-meter-long carnivore, the underground river cannot be small, and it may even be exaggeratedly big.

!”

"But with such a big river, why is Qaidam still a desert?" Wu Gang asked puzzledly.

The underground water supply is so abundant, but the ground is so dry that people can't poop and birds can't lay eggs.

Hearing this, Gu Qingyuan glared at Wu Gang angrily, "Do you think the reason why a desert is a desert is just because of the lack of water?"

"Just like the Arabian Desert, there are occasional heavy rains that can even flood cities in the desert. But even so, strong rainfall still cannot change the nature of the desert, because the amount of infiltration and evaporation in the desert is not enough.

In a month, this water will disappear without a trace."

"If you want to transform the desert just by relying on more water, you can't change this situation at all!"

"And the depth of this underground river is at least tens of meters..." Gu Qingyuan wanted to explain, but when he saw Bi Fang moving, he immediately turned back his attention and waved to Wu Gang with some disgust, "Okay, okay,

You can go to Baidu yourself, I don’t have time to answer your questions now.”

Wu Gang: "..."

Bi Fang staggered a few times and sat on the ground again, leaning against a stalactite pillar. He combed his wet hair with his hands and shook away the dripping water stains. His face was illuminated by the bright light.

Extremely pale.

But he shook his head, saw the barrage, and answered some netizens' questions.

"The basin is surrounded by high mountains. The melted ice and snow water and precipitation from the high mountains will penetrate into the desert geology of the basin and form underground water."

"For example, in the Tarim Basin, Chinese geologists even believe that the groundwater resources in the Tarim Basin are even much larger than the water storage capacity of Lake Baikal, the world's largest freshwater lake. The situation in Qaidam is similar."

"But seeing it with my own eyes, I was still shocked. This is simply an underground world!"

Bi Fang breathed the air greedily, not afraid of the poison.

"Many people may experience suffocation or toxic gases in the cave when watching some movies. We don't need to worry about the former, because there are Tiktalik here. If there is a lack of oxygen in the cave, they will not reproduce so smoothly."

"As for toxic gases, it is usually caused by the accumulation and fermentation of bat feces, resulting in excessive ammonia in the air. I just looked around and found no bats here, so there is no need to worry about this."

Bi Fang explained while taking off the backpack in front of him.

After careful inspection, he breathed a sigh of relief.

The backpack provided by the system is double-layered waterproof and tough enough. Under the bite of the strange fish, only the first layer was damaged, while the second layer was still intact, and the clothes in the backpack were dry.

Although it was not too cold, Bifang could feel that his soaked clothes were taking away his body temperature.

He pretended that the camera was removed again and the drone reappeared. At the same time, he also took off his inner lining and replaced it with a new one.

The beautiful figure revealed during the process aroused a burst of envy among water friends.

[The drone finally appeared, I almost vomited just now]

[Plus one, it’s so uncomfortable, even more uncomfortable than when I play 3D games]

[By the way, Lao Fang’s figure is too good, right? 】

【I love this muscle】

[I admire you so much]

[I took a screenshot as a screen saver]

【When can I get a figure like Fang Shen? 】

[You often live in the wild, why don't you go against bears, wolves, and snakes? In less than half a month, you can do the same. 】

Bi Fang didn't pay attention to the friend's teasing, and closed his eyes. After a few minutes, he opened them again. His eyes had begun to adapt to the darkness.

The lights on the drone were turned off at some point, and in the dark cave, the only light was the flowing underground river.

Before going into the water, Bi Fang picked a lot of flower sticks, but since there was still light, even if it was very weak, he did not want to waste resources.

Bi Fang began to examine the surrounding terrain and tried hard to picture it in his mind.

“Cave exploration is a very fashionable sport abroad and is also a popular sport for many extreme adventure sports enthusiasts. However, this is an adventurous sport after all, and most people only focus on the mystery, excitement and fun of cave exploration.

The many hidden risk factors are often overlooked.”

"Especially in an unknown cave!"

"Here, we have no road signs, guidance, or accurate reference objects. Everything is unknown. Even the length, width, and depth of the cave may not be known!"

As soon as he finished speaking, Bi Fang moved forward into the darkness, and the water droplets fell, echoing monotonously in the cave of Nuo Da.

Getting lost, rising groundwater levels, dangerous creatures, lack of oxygen and suffocation, abnormal temperature and humidity...

Accompanied by the pitch-black environment, the short words echoed in the cave, echoing continuously, making the water friends feel chills, and the original joy of escaping from the monster's mouth disappeared in an instant.

In such a deadly environment, can Bi Fang really escape?
Chapter completed!