It was June, and there was still plenty of sunlight. When the three of them were on the boat, they felt a little stuffy in their diving suits. However, the feeling of stuffiness disappeared when they entered the water. As they continued to dive deeper, the temperature gradually began to drop.
Since the heat conductivity of water was much higher than that of air, people would lose more heat in the water than on land. Fortunately, they had diving suits to protect them from the cold, and recreational divers like this generally wouldn't dive too deep. Due to the high pressure, the pressure would increase by one atmosphere every ten meters. If they went deeper than thirty meters, they would be in danger of getting drunk. Ordinary recreational diving cylinders mainly contained compressed air, which was 21% oxygen and 79% nitrogen. Under high pressure, the nitrogen would be absorbed into the body. At the same time, breathing oxygen under high pressure for too long would also cause oxygen poisoning.
The underwater ruins that Zhang Heng and the others were going to this time were about 25 meters deep. There was basically no danger at this depth. With Zhang Heng's swimming skills trained in the Black Sail quest, he could dive to this depth without any diving equipment. Of course, if he did that, he wouldn't be able to stay down there for long. Basically, he would have to go back to catch his breath when he saw the ruins.
Strictly speaking, this wasn't Zhang Heng's first time diving in Okinawa.
When he was a child, he followed his parents to Sanya to see corals. However, that was purely a parent-child leisure activity. The depth of the dive was less than eight meters, and the time he spent underwater was very short, only twenty minutes. And he was accompanied by a coach the entire time.
The first time Zhang Heng spent a long time underwater with his diving equipment was in the Apollo training camp. NASA used the underwater environment to simulate weightlessness. Not only did Zhang Heng have to stay underwater, but he also had to receive instructions from the console to complete a series of operations.
Therefore, Zhang Heng didn't feel unfamiliar when he returned to the water.
Whether it was the feeling of weightlessness or the quietness of the water, the seawater isolated almost all sounds. Every diver could basically only hear their own inhalation and exhalation, especially when they exhaled. The sound of bubbles passing through the seawater and floating up was quite reassuring.
Nelly was as competent as she said she was. She stayed less than two meters away from the two, closely monitoring their physical and mental conditions. After confirming that they didn't encounter any trouble during the dive, she gestured to the ruins not far away and asked them to follow her.
In fact, there was no need for her to specifically signal them. As long as they dove into the water, it would be hard for them to ignore the scene in front of them. It was a huge underwater palace or pyramid-shaped building. From the outside, it looked very dilapidated. It was said that it could be traced back to around 10,000 BC.
If this underwater ruin was built by the people who lived here at that time, then their level of production technology may have reached the level of the Egyptians who built the pyramids, and the latter happened around 3000 BC.
This was why many experts believed that the stone building in front of them was just a coincidence of nature. However, after seeing the neat stone steps and the smooth, square, right-angled rock walls, Han Lu was more willing to believe that this was really the relic of a mysterious lost civilization.
She even saw traces of a gate and a road.
Nellie gestured for Zhang Heng and Han Lu to come closer. She then picked up the underwater camera and took a picture of the underwater ruins in front of them. After that, she swam towards the gate.
Han Lu followed closely behind with the video recorder. Zhang Heng glanced at the time and direction on the dive computer before following behind them.
The three of them passed through the stone gate one after another. Although it was called a city gate, it was actually just three pieces of stones put together. From time to time, Zhang Heng saw tropical fish swimming leisurely in front of him. Other than that, Zhang Heng also saw a little sea hare.
Just as its name suggested, this sea creature looked as cute as a rabbit with ears (but there were many kinds of sea rabbits that looked ugly). Everyone, from strong women like Han Lu to little girls like Nelly, could not stand the cuteness of this cute creature. They surrounded it and took pictures of it like a Victoria's Secret photographer.
After about a minute, they continued to move forward. After that, the three of them swam through a somewhat narrow place. The narrowest part could only fit two people side by side. After that, their field of vision suddenly widened. It was as if they had arrived at the hall of this underwater palace.
Looking around, they saw walls made of rocks, and the sparkling water above their heads.
Nellie, who was leading the way at the front, stopped, folded her left and right hands together, and moved her thumbs up and down quickly. This was to tell the two that there were turtles in front of them. Han Lu swam over and saw two turtles between the cracks of the stone. So, she waved to Zhang Heng behind her, signaling him to hurry up and follow her.
However, Zhang Heng didn't seem to see her waving at him. He remained where he was, seemingly in a daze.
For some reason, when Zhang Heng first saw the underwater ruins, a sense of déjà vu flashed in his heart. At first, this sense of déjà vu wasn't too strong. But when he came to this open-air "hall," the feeling appeared again. And this time, Zhang Heng knew where this sense of déjà vu came from.
Previously, he had a strange dream in the Alien quest. In the dream, he came to a gloomy seaside town. When he collected the Shadow Set, he returned to that seaside town again. At that time, he felt the same way. And now, the feeling appeared again.
That was not a good sign, considering the events that followed in that small town.
Although this diving spot was quite famous, receiving a lot of tourists every year, and so far, no one had met with an accident here, Zhang Heng didn't want to doubt his instincts.
After that, he decisively gave Han Lu and Nellie a thumbs up, asking them to go up.
Nellie felt a little strange. She didn't know why Zhang Heng suddenly wanted to stop diving. She even wanted to ask Zhang Heng what kind of difficulties he encountered. On the other hand, Han Lu was more experienced. After experiencing the Dreamland of Death with Zhang Heng, she trusted him unconditionally. She also knew that there was a crazier and darker world hidden beneath the ordinary world.
So when she saw Zhang Heng's reaction, she did not question why he made such a decision. Instead, she immediately gestured for him to go up.
But then, Nellie's expression suddenly changed, and she anxiously gestured for him to go down.
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