Kicking the strange fish back into the underground river, Bi Fang hurriedly moved to the river beach, so as not to be attacked by the strange fish again.

The river flows quietly, and the fish swim in circles in the water, forming dazzling swirls of streamers, and these fish are actually glowing!

The fluorescence can even make Bi Fang see this magnificent and majestic place clearly!

What an incredible miracle of life!

Is this intracellular, or extracellular, glowing?

Why is it so bright?

Bioluminescence is not uncommon, most notably fireflies on land.

What kind of species is it that can produce so many glowing fish in an underground river?

Gu Qingyuan had already fallen into deep thought, and Wu Gang on the side didn't have so many twists and turns, he was just immersed in such a vast and unknown underground.

It's exciting!

In the moment he looked around, Bi Fang forgot the danger just now, but he had an urge to kneel down and worship.

He never imagined that there could be such a vast underground space in the world, perhaps hundreds of zhang, maybe thousands of zhang.

He couldn't measure the huge cavern with his own eyes, and 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 was going.

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

The sound of churning the water suddenly sounded, and a big light fish that Bi Fang had seen before jumped up from the river!

It seems to have been diving for a long time, and at this moment it is radiant, and as the only light source in this darkness, it is even a little dazzling.

Bi Fang squinted and took a step back, but tripped over the stone behind his feet and almost fell.

[Oh my God, it's too big here, isn't it?] 】

[Is there such a big cave?] You've just been diving for more than 20 meters, right? 】

[Brother, have you forgotten that this is a valley? I estimate that this place is probably more than 60 meters above the ground......]

[I'm never going to the Workshop Division anymore and giving it to the anchor Big Bone *1 - Praise Nature]

[Messier64 gave the anchor fish balls *10000 - drifting across the ocean, finally seeing the land, it's so beautiful. 】

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

"As I guessed, whales can only be raised in the sea, and big fish cannot be raised in a fish tank! If you want to raise a three-meter-long carnivore, then the underground river cannot be small, and it will even be exaggerated! ”

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

The underground water source is so abundant, but the ground is dry to death, and people don't poop and birds don't lay eggs.

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

"It's like the Arabian desert region, where there are occasional heavy downpours and even flooding cities in the desert. But even so, the heavy rainfall cannot change the nature of the desert, because the infiltration and evaporation of the desert will disappear in less than a month. ”

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

"And the depth of this underground river is at least tens of meters......," Gu Qingyuan still wanted to explain, but after seeing Bi Fang move, he immediately returned his attention and waved his hand at Wu Gang with some disgust, "Okay, okay, you can go Baidu by yourself, I don't have time to answer your question now." ”

Wu Gang: "......"

Bi Fang stumbled a few times, sat on the ground again, leaned back against a stalactite pillar, he combed his wet hair with his hands, shook off the water stains that kept dripping, and his face was extremely pale under the bright light.

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

"The basin is surrounded by high mountains, and the melt and precipitation from the mountains seep into the surface of the earth when it enters the desert geology of the basin and forms groundwater."

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

"But I can see it with my own eyes, I still feel shocked, this is simply an underground world!"

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

"A lot of people who watch some movies may encounter suffocation in the hole, or there are toxic gases, and we don't need to worry about the former, because there is a tiktalik, and if there is no oxygen in the hole, they will not reproduce so smoothly."

"As for the toxic gas, it's usually caused by the accumulation of bat droppings and fermentation, resulting in an excess of ammonia in the air, and I just looked around and didn't find bats here, so don't worry about that."

Bi Fang explained as he took off the backpack in front of him.

After a closer inspection, he breathed a sigh of relief.

The backpack provided by the system is double-layer waterproof and tough enough, under the bite of the strange fish, only the first layer is rotten, the second layer is still intact, and the clothes in the backpack are dry.

Although it wasn't too cold yet, Bi Fang could feel that his soaked clothes were taking away his body temperature.

He pretended to remove the camera again and the drone reappeared, while also taking off his inner lining and replacing it with a new one.

The beautiful figure revealed in the process aroused a wave of envy from water friends.

[The drone finally appeared, and I was about to vomit just now]

[Plus one, it's uncomfortable to death, it's even worse than when I play 3D games]

[Anyway, Lao Fang's figure is too good, right? ] 】

[I love this muscle]

【Admired】

[Take a screenshot and make a screensaver]

[When will I be able to train a figure like Fang Shen? ] 】

[I often live in the wild, whether I go to the line with the bear, wolf and snake, within half a month, you can do the same. 】

Bi Fang didn't pay attention to the ridicule of the sailor, and closed his eyes, and when he opened them again after a few minutes, his eyes had begun to adapt to the darkness.

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

Before entering the water, Bi Fang picked a lot of flower sticks, but since there was still light, even if it was very weak, he didn't want to waste resources.

Bi Fang began to examine the terrain around him, trying to carve it out in his mind.

"Cave exploration is a very fashionable sport abroad, and it is also a popular activity for many extreme adventure sports enthusiasts. However, it is an adventurous sport, and most people only focus on the mystery, excitement and fun of caving, often ignoring the many hidden dangers. ”

"Especially in an unknown cave!"

"Here, we have no signposts, no guides, no precise references, everything is unknown, and we may not even know how long, wide, and deep the cave is!"

As soon as the words fell, Bi Fang advanced into the darkness, and the water droplets fell, echoing monotonously in the large cave.

Getting lost, rising water tables, dangerous organisms, suffocation due to lack of oxygen, abnormal temperature and humidity......

With the pitch-black environment, the short almost words echoed in the cave, constantly echoing, making the cold hairs of the sailors explode, and the joy of escaping from the monster's mouth disappeared in an instant.

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

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