When he opened his eyes again, Zhang Heng regained his vision, and it was clearer than before the red tide appeared.
This was the first time he used the Filter Lens underwater. Initially, Zhang Heng was a little worried about whether the red seawater belonged to the natural environment. However, it seemed that the Filter Lens was still effective against the red tide.
Not only did the red color disappear, but even the seawater within 300 meters became transparent.
Zhang Heng quickly found Nelly, who had separated from him earlier.
The latter was swimming deep into the ruins, and in front of her, Zhang Heng's old friend, a half-man, half-fish frog monster was holding a flashlight, flashing it from time to time, luring Nelly to follow him.
Zhang Heng didn't find any other monsters around him.
Another piece of good news was that when Zhang Heng observed the half-man, half-frogfish monster for a while, he found that the red seawater also affected it. It was just that its visibility in the red tide was still higher than that of humans. It could only see about three to four meters in front of it.
This was why it could see Nelly, but Nelly couldn't see it clearly.
However, Zhang Heng still couldn't find Han Lu nearby.
In fact, he couldn't find any place to hide as far as his eyes could see.
However, Zhang Heng knew that Han Lu's disappearance must have something to do with this half-man, half-fish frog monster. As long as he followed this monster, he might be able to find Han Lu.
Zhang Heng did not hesitate anymore. After putting on the mask, he immediately swam toward Nelly. At the same time, he always paid attention to the distance between himself and the monster in front of him, keeping himself out of the monster's field of vision.
Zhang Heng saw Nelly coming to the stone wall where Han Lu was before being led by the monster. Just when Zhang Heng wondered if they had nowhere to go, he saw the stone wall suddenly tremble. After that, the crack on the wall, which was about a foot wide and could only accommodate a turtle, began to expand. It looked like a giant beast opening its mouth.
The half-man, half-frogfish monster that led the way took the lead and rushed directly into the crack. After that, he took out a flashlight and called out to Nelly who was behind him. However, no matter how slow Nelly was, she felt a little threatened by the sudden appearance of the crack.
She hesitated for a moment outside the crack, but in the end, her desire to find Han Lu overwhelmed her fear of danger. Gritting her teeth, Nelly swam into the crack.
But not long after she entered the crack, the flashlight in front of her disappeared.
Nelly's brain, which was affected by the red seawater, became a little clearer. She began to feel afraid. Diving guides were not life-saving talismans for divers. They would help their divers deal with some dangers, but that was only within the scope of their abilities.
And when the danger was out of their control or they were in danger, Hidden Guides also needed to know when to let go. After all, this was just a job, and being a hero often meant that one had to pay the price.
The current situation was obviously out of Nelly's control. She was in a strange undersea tunnel, surrounded by strange rocks, and the visibility was very low.
Nelly did not know how long the tunnel was, if there were any forks in the tunnel, and where it would take her. She had just swum a short distance forward, and according to the dive computer, the depth she was in was gradually decreasing. This was not a good sign. Besides, Nelly finally remembered Zhang Heng, whom she had left behind.
This was one of the main reasons why she decided to turn around.
However, when she returned to where she came from, she discovered something that made her feel incomparably horrified.
The crack on the rock wall had now closed again, returning to a width of only about a foot.
At this time, Nelly could no longer calm herself down. She tried to insert her palms into the gap and pry open the rock walls on both sides. Since the crack could expand, it meant that the surrounding stone walls should also be movable. However, reality poured a bucket of cold water over Nelly's head.
No matter how hard she tried, the crack remained motionless. It was as if the huge opening did not exist at all.
And after some intense activity, Nelly had consumed a lot of compressed air. At the same time, she began to feel frustrated. Fortunately, she had a wealth of diving experience, and she had dealt with some underwater crises before. Even in such a harsh environment, she did not completely break down like those rookies.
After confirming that the crack in front of her would not open again, Nelly calmed down, checked her residual pressure gauge, confirmed her direction from the dive computer, and continued to swim along the underwater tunnel.
Now, she could only hope that there was another exit in front of her that would allow her to leave this place.
Nelly turned on the flashlight to illuminate the road ahead and look for an exit. She also hoped to get in touch with "Han Lu" again.
However, she did not see Han Lu again. Instead, she saw something else.
When the underwater ruins of Yonaguni Island were first discovered, it caused a great sensation. However, there was no critical evidence to prove that the ruins were really built by a lost civilization. Even the seemingly neat brick walls and steps might just be a coincidence of nature.
In order to support the hypothesis of the ruins, some enthusiasts even forged some coins or pottery pots with magical patterns engraved on them. However, these fake goods obviously could not stand the test of modern technology.
However, Nelly knew that what she saw now was definitely not forged by modern people.
The wall carvings on both sides of the stone wall obviously had a very long history. Unexpectedly, they were not difficult to understand. They told the story of some creatures that looked like mermaids hunting sea beasts. Other than that, there were also stories of some of them falling in love with humans. At least from Nelly's point of view, that was the case.
The mermaids gave gifts to the woman on the shore. After that, the two married, and the woman gave birth to children. Those children grew up for a period of time before returning to the sea. In the eyes of a girl like Nelly, it was quite romantic.
She was even a little fascinated by the carvings. Even after the baptism of time and the erosion of the sea current, the carvings were still magical and lifelike. If she were not in danger, Nelly would definitely stop and admire them.
In fact, she had already taken out her underwater camera and pressed the shutter of several of the wall carvings.
These wall carvings were tantamount to the ending of the ancient ruins on Yonaguni Island. Whether it was the work of nature or the work of earlier humans, any one of these carvings would cause a huge sensation on the shore.
Of course, that was if she could return to the shore alive.
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