Opening his eyes again, Zhang Heng also regained his vision, and it was clearer than before the red tide appeared.

This is the first time he has used [filter lenses] underwater, Zhang Heng was originally a little worried about whether these red seawater waters belong to the category of natural environment, but now it seems that [filter lenses] are still effective for this red tide.

Not only did the red color disappear, but even the sea became transparent within three hundred meters.

Zhang Heng soon found Nelle, who had been separated from him before.

The latter was swimming towards the depths of the ruins at this moment, and in front of her, Zhang Heng's old friend, a half-human, half-fish frog monster was holding a flashlight, flashing a few times from time to time, luring Nelle.

Zhang Heng didn't find any other monsters on the side for the time being.

And another good news is that when Zhang Heng observed the half-human, half-fish frog monster for a while, he found that this red sea water also had an effect on it, but its visibility in the red tide was still higher than that of humans, about three to four meters in front of him.

That's why it can see Nelly, but Nelly never gets to see what it looks like.

But Zhang Heng still couldn't see Han Lu nearby.

In fact, as far as his eyes could see, there was nothing to hide.

However, Zhang Heng knew that Han Lu's disappearance must be related to this half-human, half-fish frog monster, so as long as he followed this monster, he might be able to find Han Lu.

Zhang Heng didn't hesitate any longer, and immediately swam to Nelly after putting on the mask, while always paying attention to the distance between himself and the monster in front of him, keeping himself out of the other party's field of vision.

Zhang Heng saw that Nelly was led by that monster to the stone wall where Han Lu was before, just when Zhang Heng was puzzled that they had no way out, he saw that the stone wall suddenly trembled, and then the crack above about a foot wide that could only accommodate a turtle to swim through began to expand, like a giant beast that was opening its mouth.

The half-human, half-fish and frog monster who led the way took the lead and rushed directly into the crack, and then took out a flashlight and beckoned to Nelly behind, but no matter how slow Nelly was, she felt a hint of danger at this time in the face of the sudden crack.

She hesitated outside the crack for a moment, but finally found that Han Lu's desire to find it overcame her fear of danger, and Nelly gritted her teeth and swam into the crack.

But it wasn't long before she could get into the crack before the flashlight beam in front of her vanished.

Nelly's brain, affected by the red seawater, was also a little clearer, and she began to feel scared, the dive guides were not a lifesaver for divers, they did help their divers deal with some dangers, but it was only within their capabilities.

And when the danger is beyond their scope or endangers themselves, the dive guide also needs to know when to let go, after all, this is just a profession, and being a hero in many cases means paying for generations.

The situation was clearly beyond Nelly's ability to deal with, as she was in an unfamiliar underwater tunnel, surrounded by strange rocks and low visibility.

Nelly didn't know how long this road was, whether there was a fork in the road, and she didn't know where this road would take her, she had just swam forward for a short distance, according to the dive computer, the depth she was at was gradually decreasing, which was not a good sign, in addition, Nelly finally remembered Zhang Heng who was left outside by her at this time.

This was also a big reason why she decided to make a U-turn.

But when she returned the same way, she found something that made her feel extremely frightened.

- The cracks in the rock wall that had been before were now closed again, and they were only about a foot wide.

Nelly couldn't calm down anymore at this time, she tried to insert her palm into the crack and break the rock walls on both sides, because since this crack could be expanded before, it meant that the stone walls around it should also be movable, but reality poured cold water on Nelly.

No matter how hard she tried, the crack didn't move, as if the huge opening didn't exist at all.

And after some strenuous activity, Nelly consumes a lot of compressed air and starts to feel depressed. But fortunately, she has a lot of diving experience after all, and she has dealt with some underwater crises, and even in such a harsh environment, she has not completely collapsed like those rookies.

After making sure that the crack in front of her would not open again, Nelly collected her emotions, checked her residual pressure gauge, confirmed her direction from the dive computer, and continued to swim along the underwater path.

Now, she could only hope that there was some other exit ahead that would allow her to get out of here.

Nelly turned on the flashlight, firstly to light the way ahead and find an exit, and secondly, to get in touch with "Han Lu" again.

But then she didn't see Han Lu again, but she saw something else.

Yonaguni caused a stir when it was first discovered, but there has been no crucial evidence that the ruins were built by a lost civilization, and even the neat-looking brick walls and steps may have been a natural coincidence.

In support of the relics hypothesis, some fanatical enthusiasts have even forged coins or clay pots with magical patterns themselves, but these Xibei goods obviously do not stand the test of modern technology.

However, Nelly knew that what she was seeing now was definitely not something modern people had faked.

The carvings on either side of the stone wall obviously have a very long history, but they are surprisingly not difficult to understand, telling the story of some mermaid-looking creatures hunting sea beasts, and in addition to the story of some of them falling in love with humans, at least from Nelly's point of view.

The mermaid gave a gift to the woman on the shore, and then the two were united, and the woman gave birth to children, and those children grew up for a while and then returned to the sea, which was quite romantic in the eyes of a girl like Nelly who had heard a lot of mermaid legends.

She was even a little fascinated by the carvings on the walls, which were still magically lifelike even after the baptism of time and the washing of the currents, and if it weren't for the fact that she was in danger, Nelly would definitely want to stop and admire them.

In fact, she had already pulled out her underwater camera and pressed the shutter on several of the wall carvings.

These wall carvings put an end to the battle over whether this ancient site on Yonaguni Island was the work of nature or was built by earlier humans, and any one of them would cause a huge stir if it was brought ashore.

Provided, of course, that she makes it back to shore alive.