There is a one-meter-diameter circular hole at the top of the object, which is presumably the passage into the interior. The entrance to the cave should have had a lid earlier, but now the lid was long gone, and all that was left was a black hole, like a monster's mouth.

It shouldn't be open underneath the opening, because the water here is calm and doesn't have the feeling of being sucked into a whirlpool. If a whirlpool is really formed, then we are simply sent to death if we go in like this!

"Kesi, you must go down to the well, and then seal the mouth of the well with a hatch cover, so that the water pressure outside will have no effect on you, and you can open the inner hatch and enter inside. Zhou Hong's voice suddenly sounded in my headphones. The other team members also received instructions from Zhou Hong. Because we're all on the same channel, we can hear each other's calls.

"But where's the hatch?" I asked.

"I'll give you an airdrop right away!" replied Zhou Hong.

"Airdrops, we're in the water!" I was so shocked that I almost thought I had misheard.

"Don't make a fuss, the airdrop is already here!" Tang Jinhua said to me as she pointed to the water above my head.

Because we all wear respirators, we can't talk even if we're face-to-face, but we can still communicate through headphones and gestures.

When I looked up, I saw something like a long torpedo-shaped tube rushing from the surface of the water to the bottom, and in the blink of an eye it had sunk to the riverbed in front of us.

I heard the crowd shouting through my headphones, "This isn't a torpedo, is it going to explode?"

I took a closer look, and saw that there was a small airdrop box tied to the tail of the thing, and I understood that this was the airdrop dropped by the drone, and hurriedly said to everyone: "Don't mess up, everyone, this is an airdrop, not a torpedo!"

I swam over and opened the drop box, and sure enough, I found a hatch, and I put the hatch on the well, and it was seamless, as if it were made to the size of the wellhead!

"There's nothing surprising about this, it's easy to make such a hatch cover that fits the size perfectly," Tang Jinhua said to me, "You lead everyone down first, and I'll cover the hatch in the back!"

"Mr. Tang, can this hatch withstand the water pressure above?" I wondered.

"Don't worry, it's dense and strong enough to withstand the water pressure up there!" Tang Jinhua said.

I led the people down to the well - after going down more than ten meters, we reached the bottom, and then there was a straight pipe, also one meter in diameter, and we could only go forward in a half-squat, and we could not straighten up at all. After advancing more than ten meters, we reached the end. There is a pot-shaped bulge at the end, which is also supposed to be a hatch cover, and because it has been soaked in water for many years, it has absorbed a thick layer of silt and aquatic life on it, so it is impossible to see its original face at all.

I pushed it with my hand, but it felt so heavy that I couldn't have opened it without the help of a mechanism.

"Kesi, have you arrived?" At this time, Tang Jinhua's inquiry voice came from my earphones.

"We've arrived, but we're blocked by a hatch and we can't open it!" I replied.

"Don't open it yet, wait until I close the hatch!" Tang Jinhua said.

Tang Jinhua didn't say, I also understand that this hatch can't be opened now, once opened, it's okay to be a body of water inside, if it's a dry environment, it will form a siphon effect, and under the huge water pressure, we will never recover!

"I understand, wait until you signal it before turning it on!" I replied.

After a while, Tang Jinhua's voice came from my headphones: "Okay, you can open it, turn it on slowly, and then open all the hatches when the water is finished!"

After receiving Tang Jinhua's instructions, I went to push and pull the hatch, but the thing seemed to have taken root, and it didn't move! I had to ask Tang Jinhua again, hoping that she would give me some instructions.

Tang Jinhua replied: "You better go and ask your girlfriend Zhou Hong, I can't help it......"

I had to call Zhou Hong again, but there was no response in the earphone, I don't know if she didn't hear it or the signal was interrupted again?

At this time, the Zhu madman who was following me came up with an idea: "Kesi, blow it up with a bullet!"

"Blow it up, do you want us to play it all?" I scoffed.

"Koji, take a picture and send it to me!" my girlfriend finally responded, saying to me in her headphones.

Because this was underwater, ordinary photographic equipment could not be used at all, so I activated a waterproof camera placed on the mask, "clicked" at the hatch, and then transmitted the captured image to Zhou Hong.

After a while, Zhou Hong's voice came from my earphones again: "Drain water first-see a bowl-shaped bulge near the ground in the lower left? Pull it out! If you can find the direction of the spiral, you will save more effort......

"Understood. After talking to Zhou Hong, I went to pull out the bowl-shaped bulge, and I didn't care if the spiral direction was or not, in short, I just used brute force to pull out the thing......

As soon as the thing was pulled out, the water level in the pipe immediately began to drop, and in a short time, there was not a drop of water in the entire pipe.

I went up to push the hatch again, but with a slight push, I knocked the hatch down......

Behind the hatch was a relatively spacious world, to be exact, an underground cavern, with some water in the hall, but mostly dry ground.

We cautiously walked up a slope for more than ten meters, only to see that the ground in front of us was full of piles of round stones reflecting a silvery sheen, and we had to go around these piles of stones to reach the end of the cave hall.

"Kesi, remind everyone to be careful, don't be careless, and don't touch those piles of rocks casually!" Tang Jinhua said to me.

Since we no longer need to dive, we have taken off our diving gear and are wearing only our combat coats and forbidden palace armor, while also being able to breathe the air of this cave hall freely.

Zhu Luozi and Long Gui and I walked in the front to open the way, Heng Qi, Xie Ke and Liu Yong walked a few steps behind us, Li Liang, Dong Zegui and Huang Ran ran walked behind Heng Qi and others, and Tang Jinhua walked in the last tail.

"How do I feel that these stones are dinosaur fossil eggs? I wonder if I can pick one up and take it back as a memento of this expedition?" Huang Ranran suddenly smirked.

"Huang Run, don't die!" who knows if there will be deadly bacteria and viruses on these stones?" everyone shouted.

"Click......" At this moment, a strange voice suddenly came from somewhere!