The waterhole was not big, and Officer Li and the three of them quickly dived into the hole.

Moreover, things were much simpler than expected, and in less than five minutes, the three of them came back together.

"Officer Zhu, this is indeed a cave that has been submerged underwater, but the underwater part is not long, at most ten meters, and then it will be in the cave." Officer Lee began to report. "The depth of the water in the tunnel is about two meters, and as long as you know a little bit of water, you don't need diving equipment at all."

"We just took a look at it, and it's a huge cave hall, so deep that I don't know where it leads."

Zhu Ting snorted and asked, "Is this section of the cave in the water wide?" ”

"It's wider than the part that is exposed to the water, almost five meters."

"Okay, you take someone to get the equipment in first, and leave four people to break it off with me." Zhu Ting nodded, turned around and said to Xiao Ling: "Xiao Ling, do you all know water?" ”

"At a distance of ten meters, Wang Hui and I must be fine, I don't know if the monk can do it." Xiao Ling smiled.

"Little KISS!" Wang Hui snapped his fingers.

"I'm fine." Liu Can rolled his eyes.

"What about the two of you?" Zhu Ting asked Li Xue and Luo Ziyan again.

The two girls shook their heads at the same time, indicating that they would not.

Zhu Ting didn't say anything more, beckoned the four policemen over, ordered each of them to be responsible for one, and brought Li Xue and Luo Ziyan in.

At that moment, everyone hurriedly prepared, and Xiao Ling took Wang Hui and Liu Can and followed Officer Li into the cave first.

As Officer Li said, the space inside the cave was huge, at least more than ten meters high and more than thirty meters wide, and the further inside, the more spacious the cave hall became.

From here, the pool becomes an underground river, eight or nine meters wide, and extends into darkness along the cave wall on the left.

After Xiao Ling and the three of them helped everyone pick up the equipment one by one, they began to carefully look at the surrounding environment.

Starting from the bank, the right side of the dark river is a slope with a width of about four meters, except for the slippery near the edge of the dark river, the ground gets drier the higher you go, and the vertical height difference from the top of the slope to the surface of the dark river does not exceed one meter.

The top of the slope is very flat, the rocky ground seems to be a whole, fourteen or fifteen meters wide, very clean, except for some small stones, basically no dust can be seen. At a glance, it is a broad road.

"Hold the grass, why is it so clean here and there is no musty smell?" Wang Hui muttered.

"Maybe it's due to the special geographical environment." Liu Can shone his surroundings with a flashlight.

"Breathing so smoothly, the air here must be circulating, can't the dust outside get in?" Wang Hui continued.

"Nature's creation. Perhaps the cave has a small entrance to the outside world, and there are more plants at the entrance of the cave, so they play a role in alleviating and filtering! Xiao Ling explained, while taking a look at the place near the entrance, and found that it was completely a stone wall, and it was very flat.

"Have you noticed that this cave hall doesn't seem to be all natural?" Liu Can had already walked to the far right side of the cave hall and was touching the cave wall with his hand.

Hearing this, Xiao Ling and the others immediately rushed over.

Soon, they understood what Liu Can meant.

Although the walls of the cave look a little close to the shape of the lava when it cools, if you pay a little attention, you will notice that its surface is far from smooth.

"It looks like this on purpose." Wang Hui also reached out and touched it. "It's kind of like a masterpiece of construction machinery. Could it be that someone dug up this cave hall? ”

"Dig it, why are you so deliberate?" Liu Can was still puzzled.

Xiao Ling didn't talk immediately, he looked at it for a long time, and then said: "With our current engineering equipment, the excavation of rocks will definitely not be able to do this level." ”

"You see, this stone wall is not only different in shape, but also very random, and human machinery simply can't complete it!" Xiao Ling shone a flashlight on the roof of the cave again, "Even the roof of the cave is the same." ”

"It can't be an alien, right?" Wang Hui was puzzled.

"God knows. But one thing I can be sure of is that it was definitely not Yu Zhenxing who did it. Xiao Ling retracted his gaze, turned around and walked back, because all the people and equipment had already come in.

Over there, Officer Li commanded everyone to move all the equipment to the dry slope top and rearrange and pack.

"Officer Zhu, should we find a place to put away these diving equipment first, I don't think we will need it later."

"Well, that's fine, you can reduce a lot of burden." Zhu Ting nodded.

As soon as he heard this, Xiao Ling immediately walked quickly to their side and hurriedly said, "No! Must bring! ”

"Why not?" Officer Li glanced up at him and continued, "We made a mistake in our prediction, just a little water, and we don't need diving equipment at all. ”

"I remember very well that Uncle Luo once said that he and Yu Zhenxing came here for a blue hole! But by now, have we seen the blue hole? ”

"yes, that's what my dad said, and besides, his discovery has something to do with the blue hole." Luo Ziyan on the side hurriedly interjected.

"Blue Hole?!" Zhu Ting immediately frowned, and said suspiciously: "The clues left by your father only mention 'there is a hole in your clothes, and those who go will not return it', isn't he talking about this cave?" ”

"Probably not!" Xiao Ling is sure to be authentic.

"Blue holes are usually relatively deep, Yu Zhenxing will never build a secret laboratory under the blue hole, right?" Zhu Ting's doubts seemed to be deeper.

"I think it's best to be prepared!" Li Xue smiled: "Don't wait for the matter to come to an end, we have to come back." ”

Officer Li lowered his head and pondered for a moment, then raised his head: "Let's take it with you." ”

Zhu Ting didn't answer again, let everyone rest for ten minutes, and then continued to walk deeper into the cave.

In order to save energy, dozens of people except for those who are responsible for guarding and opening the road have turned off their flashlights, and Zhu Ting also asked the police to prepare weapons - Type 95 automatic rifles!

Putting aside other factors, just based on Luo Yi's sentence 'those who go will not return', Zhu Ting has an absolute reason to implement armed vigilance.

Because the ground was dry and clean, Xiao Ling and the others had never found any trace of the people who had come in before, and the only thing they knew was that the cave hall was extending downward at a small angle.

After two hours, the cave hall began to narrow, and this 'broad avenue' slowly leveled with the dark river. After walking for more than ten minutes, a strange sound of water was heard in the distance, like the sound of a water pump sucking water.

"Nima, there's even a pumping machine here!" Wang Hui immediately shouted.

"Meat ball, do you have a little brain, where did you hear the voice of the pump itself? Besides, can you move without an electric pump? Liu Can immediately took a sip of Wang Hui.

"It's the sound of the whirlpool, and the river should have come to an end." Officer Lee said.

"Guess what's going on, just go over and see." Zhu Ting took the lead and hurried forward.

In less than five minutes, there was no way ahead, and what appeared in front of everyone was a huge waterhole. The surface of the water is at least eight or nine hundred square meters, more than four times larger than the one at the entrance of the cave!

The cave hall came to an abrupt end here - across the waterhole was a huge stone wall.

And the sound came from the front left of the pool!

"Turn on all the lights!" Zhu Ting spoke immediately.

Hearing this, everyone turned on the flashlight and shone it on the surface of the pond together.

Under the illumination of more than 20 flashlights, the entire waterhole immediately made it clear to everyone: the water in the entire waterhole was rotating, and the farther to the left, the faster the water rotated.

When they looked closely, everyone couldn't help but gasp: near the stone wall, there was a huge whirlpool with a diameter of more than two meters!

Xiao Ling immediately muttered in his heart: Could it be that this is the so-called blue hole?!