After a while, Ye Xi raised his head: "Has anyone gone in and seen it inside?"

Cangwu nodded: "Several ancestors have been in, but most of them have never returned...... In fact, I've been in it too. ”

Ye Xi was taken aback.

Cangwu said calmly: "I didn't swim to the end for five days, and finally I had to return." ”

"No one knows how deep that hole is. ”

Ye Xi's brows furrowed more and more.

He knew how fast the fog was, what was the concept of swimming for more than five days in a row, and he was afraid that he could cross the Atlantic Ocean, but he didn't swim to the end of such a long distance, which was incredible.

Does that sea cave lead to hell?

Ye Xi thought for a moment and asked, "Did you feel that the water pressure increased or the sea water became hot when you were swimming?"

Cangwu shook his head and said with certainty: "It's dark inside, but there hasn't changed much." ”

Ye Xi sat down cross-legged on the seabed.

He drew a huge circle on the sand with his index finger, and then drew a circle inside the circle, and then drew a circle, and wrote the words crust, mantle, and center of the earth on the side. After staring down for a moment, a long, curved line was drawn in the earth's crust.

Cangwu tilted his head: "What is this?"

Ye Xi: "The earth below us. ”

Cangwu looked up in confusion: "??"

Ye Xi was amused by her shocked expression, his frowning eyebrows loosened, he laughed, and said, "Yes, it's a very large sphere. ”

"My guess is that maybe this underwater hole is connected to another part of the ocean. ”

Cangwu muttered, "Connected to another sea?"

Ye Xi: "This is just a guess, you think about it to see if there is such a possibility." ”

"No way, I've been to almost all the seas, but I've never seen anything like a cave monster living in any of them. ”

"Maybe it's very, very far away, and you've never been there?"

Cangwu stopped talking, and after a moment of silence, he drew his fingers on the sea sand, and with a few strokes, outlined the coastline of the Arctic glacier, and then the coastline extended to the south, accurately depicting the continental coastline. After a while, some lines were drawn in the east at a great distance.

"That's all I've been to. ”

"Here. "It's all undersea volcanic mountains, the water is turbid and hot, and I haven't crossed the mountains to see the other side." ”

"From Xicheng to the underwater fire mountain range in the east, it will take me at least a month to swim at full speed, which is very far away. ”

Cangwu drew a vertical line between the line from the west coastline to the eastern submarine mountain range, pointed to the left half and said: "Because it is too vast, in fact, we mermaids only live in this small half of the sea. ”

Ye Xi pointed to the southernmost part of the outline of the western coastline: "What about here, what is the place west from here?"

Cangwu: "This is a sea of storms. ”

"There is a huge wind and waves, the sea water and yellow mud are mixed together, it is very turbid, this sea is very mysterious, even the mermaids are not easy to find their way, and it is said that they can see all kinds of terrifying visions. ”

"I've been through the sea of storms, but ......"

Ye Xi mentioned it in his heart.

What weird dangers have you encountered?

Cang Wu's eyebrows frowned slightly: "The sea water is too dirty." ”

Ye Xi: "......"

After sorting out his thoughts, Ye Xi concluded: "So the east of the submarine volcanic mountain range is an unknown sea area, and the west of the storm sea is also an unknown sea area. Perhaps this undersea hole leads to both places. ”

There are so many powerful sea monsters in this prehistoric world that there are sea monsters that are good at burrowing, and it is not surprising that they drilled such an amazing passage into the ground tens of thousands of years ago.

Cangwu didn't speak, looking down at the lines outlined on the sea sand, his eyes moved slightly.

Ye Xi looked at Haishatu and stopped talking.

The atmosphere fell silent all at once.

Despite this speculation, the solution has not yet been found. How can such a huge underwater hole with a diameter of 50 miles be made to disappear and sealed with cement? Is it to be filled with sea sand?

I'm afraid that even if it costs a lot of money to seal the hole, I'm afraid it won't be useless......

Ye Xi's gaze moved to the stone carving mural buried by the sea sand under him, and gently brushed the sea sand away, revealing the wall carving. What is recorded on this stone tablet is the picture of the merman tribe trying to seal the hole in the bottom of the sea.

What he could think of, the merman ancestors also thought of, and made an attempt.

Cangwu saw that Ye Xi was looking at this wall carving, and sighed and explained: "There was once a generation of sea lords who led the whole clan to try to seal that big hole. ”

"They spent unimaginable effort weaving countless shark silk, first covering the hole with shark silk, and then somehow moving several huge mountains and pressing them down at the hole. ”

"In the end, the seal was sealed, but many new holes appeared in other places, and those things came out of other places, and the clan suffered heavy losses as a result, and many people died. ”

Ye Xi looked at the wall carving, and he could completely imagine that picture.

He could imagine how the mighty creatures in the sea cave violently slammed into the sealed hole, and the terrifying loud noise came one after another, and the sea sand on the seabed shook like an earthquake.

Under such a terrifying impact, the tenacious shark and the huge mountains fought to block it, but the shark people only rejoiced for a few days, but they were desperate to find that these monsters had drilled several new passages from elsewhere.

Because they didn't know where the new holes appeared, and they didn't know how many monsters had been drilled in total, the sharks couldn't prevent it, so they suffered extremely heavy losses, and in the end they had to remove those mountains and remove those sharks.

Ye Xi rubbed his forehead.

Therefore, it is not enough to only seal the surface of the sea hole, and you must find a way to seal the entire undersea passage!

However, this huge project is definitely not something that can be done by manpower, even if each merman exerts the spirit of Yugong to move mountains, constantly throws stones into the sea hole and buries the sea sand, and continues to fill it for hundreds of years.

Wait a minute!

Ye Xi's eyes lit up when he thought of something.

Another way of thinking, the sea sand and rocks are not filled, but if ...... Freeze all the sea water in the sea cave!

He can dive into the sea cave and draw a cold witch pattern on the wall of the passage to freeze the water......

No, no, from the description of the fog, it can be known that the depth of the sea hole is very terrifying, even if his magic power is exhausted, it is estimated that he will not be able to freeze all the sea water in the hole.

Ye Xi came up with one method after another in his mind, and eliminated one by one.

In the end, he could only smile bitterly.

I really can't think of a way to do it once and for all.

The best and most humane method is that the merman race takes turns to guard the sea hole, you guard for a period of time, I guard for a while, but the other mermen are not strong enough to hold it, and the merman is a race with a strong sense of territory, and is unwilling to stay with so many people for a long time, so what can I do?

"Ah Wu ......"

Thinking that Ye Xi also gave up in the end, he sighed and hugged Cangwu, bowed his head and said, "I will settle Xicheng as soon as possible, give me a few more years, I will accompany you in a few years, and we will guard there together in the future." ”

Although the days were predictably very, very dull, he was really reluctant to let his partner stay alone in such a cold and dark place, and that was the only way.