"I think you've noticed the weirdness of the whirlpool in the sinkhole. The water entering it is not a naturally formed whirlpool, of course, I am not saying that the water cannot form a whirlpool there, but that the water will inevitably form a whirlpool after entering there. What does the phenomenon that appears on the surface of the entire vortex mean? ”

Jack looked up at me after throwing the question. He didn't expect my answer, though.

"It's resistance. Huge resistance. The bottom of the sinkhole whirlpool is supposed to be in the shape of a funnel, much like a crater. It has a cavity in the center, and it is easy to create a vortex, but where does that great resistance come from? This resistance destroys the formation of the vortex, but the vortex is formed again, what is going on?

Let me start by analyzing the role of this complex vortex. Like I said, it's first and foremost a grinding disc, and the water and the funnel-shaped surface below create a huge friction. Without exception, everything in the water will be shattered under this friction.

The white bubbles or foam on the surface of the whirlpool are formed by the friction between the whirlpool water flow and the surface. The fact that so much foam can be formed, such a spectacular scene, shows that the surface will not be flat. And this sinkhole whirlpool does not exist for a short time, even if there are uneven places on its surface, it should be polished into a smooth surface during countless years of water milling. But the truth is that instead of being polished and smoothed, it is extremely sharp and shreds everything that enters it. Why?

I think you've also noticed that the waterways that enter the whirlpool of the sinkhole, and the outside, have obvious signs of artificiality. I suspect that the bottom of the sinkhole vortex is also artificially carved, and someone is even maintaining it. Make it work for a long time. It serves two purposes, one is to direct and accelerate the flow rate of the vortex, and the other is to crush any object in the swirl.

Because the bulge at the bottom of the sinkhole whirlpool must slow down the swirling flow while crushing the objects in the water flow, it must also be designed to increase the flow velocity. As you can see, the vortex is moving fast and is not slowed down by resistance. And the bumps on the bottom of the water should be many and obvious, otherwise, the surface of the water will not be stirred white. ”

Jack's words shocked and brood me. But I also found something wrong. "You're guessing, not analyzing."

"Is there a difference? Or do you have other guesses? All we see is that moment. Time is fleeting. We can only deduce the truth of things based on what we see. I conclude that the function of this sinkhole vortex is to obliterate all living creatures that enter the underground lake. Including the resonances generated within it, it is also for this purpose. Jack said categorically.

I'll admit that I didn't think as deeply as Jack, also because I didn't have time to think about it, but I couldn't agree with him. Because I can't imagine that such a big grinding disc was artificially made. What's the point of just stopping creatures from entering underground lakes.

And Jack's argument overturns some of my earlier beliefs. I initially thought we had been brought here by a group of red* red snakes and the python. Their purpose should be to treat us as food. That python did the same. Our escape into the waterway was an accident in itself.

The whirlpool of the sinkhole does have the power to strangle everything. But what is its purpose? It is indeed possible that it has been artificially carved, is this the ancient tomb that the Vietnamese say? If so, it can be explained. This sinkhole whirlpool is the entrance to the tomb, and it is designed to prevent tomb robberies.

But another problem arises. When the rain is abundant, this design can serve the purpose of preventing tomb robbery, but what about the season when there is no rain? I believe that if there is no water, the uneven design at the bottom of the sinkhole whirlpool is more conducive to climbing. And those snakes alone will not stop the courage of the tomb robbers.

I told Jack what I thought. Jack thought for a moment and said, "When there is no rain, there may be other anti-theft measures that work, and they have spent so much effort to build this project, it is impossible not to think about it." ”

"Maybe." I snuff out the cigarette butt. "But we don't have time to think about these issues, we can't get out the way we came, so we should hurry up and go downstream, at least we have to find food before we starve to death."

This is the end of our break. On the way back, I couldn't even think about it, and I had to focus all my energy on observing the road conditions and not falling into the underground river. When they returned to their resting place, all the people were dressed.

At my suggestion, we took an inventory of all the supplies, because we were about to leave and I had to know how many resources we had on hand. No wonder Jack would have a problem with me, except for the batteries, all the supplies were with Jack and the Vietnamese. As Jack said, they did what people were in.

First of all, the rope, the only rope left between me and the Laotians is the rope with a hook in Buasong, and the rope is not long. Jack and Ah San each have a long trekline in their backpacks. There are three treasures for survival in the wild, and the rope is a very important one.

The glowsticks are all in Jack's backpack, I know. What I didn't know was that he also had two hand-held flares, a flash, and an incendiary* bomb in his backpack. These were captured from the Vietnamese. He carried all his weapons and lighting resources with him, and put other supplies in the backpacks of two Vietnamese, which also caused Ah Xiang to lose most of his food when he was killed.

This time, Jack gave me all the bullets, and this time my backpack was the most burdened. I think the best news is that we have three complete first aid kits. This will prevent us from dying immediately in the event of an accident.

I stuffed one into my backpack with a first aid kit, and I wouldn't burden myself with anything else, such as a tarpaulin, a sapper shovel, including a rope, etc., all in Jack and San's backpack.

While I was counting the supplies, Jack had a leisurely attitude, and I think he knew the amount of supplies better than I did, even counting them when I was unconscious.

After counting the supplies, I had to face the problem that I had to solve, Lao Phu Mi. He had a broken leg and someone had to carry him on the road below, and I was worried that his broken leg would not be able to withstand the movement of his back. If we can't carry him on our backs, we'll be in big trouble and even consider keeping him here. We didn't have a stretcher, and even if we had, we wouldn't have been able to carry him on the riverbank.

Fumi sat on the edge of the fire. I looked at him and said, "How's your leg?" Is there a problem walking on your back? ”

Fumi looked at me blankly. I motioned to Ah San, and Ah San immediately relayed my words to Fu Mi competently. Fumi nodded and spoke in a short Lao dialect.

Ah San said to me, "He said it's okay. ”

Buazon hurriedly motioned for him to carry Fumi on his back. Of course I know that Buazon is afraid that Fumi will be left here.

I lifted Tomi's trouser leg and looked at it. There is a bandage on the calf, and it looks very professional. I touched it with my hand, and it was hard inside, as if it was a splint.

I looked at Ah San with an inquiring look. Ah San carefully signaled to me that Jack did it.

Before I could speak, Jack said, "Well, believe I have a master's degree in medicine." ”

My back hurts. "No matter what, you won't touch my back. Does Duke University have a veterinary major? ”

Jack's face turned red all of a sudden, and he looked like he was about to duel.

"Let's go." I quickly changed the subject. (To be continued......)