Chapter 905

It's June now, and the sun is still quite abundant. Therefore, when they were on the ship before, they all felt a little stuffy in their diving suits. However, when they entered the water, the stuffy feeling disappeared, especially with the increasing depth, the temperature began to gradually decrease.

Because the heat conduction capacity of water is much higher than that of air, the heat loss of people in water is also greater than that on land, but the good thing is that there are diving suits to keep out the cold, and leisure diving like this kind of diving generally does not dive too deep. Because of the pressure, every 10 meters of diving in the water will increase an atmospheric pressure, and after more than 30 meters, there will be the risk of nitrogen intoxication (ordinary leisure diving) The diving cylinder is mainly filled with compressed air, that is, 21% oxygen and 79% nitrogen. High pressure will let nitrogen into the body. Similarly, too long breathing time of oxygen under high pressure will cause oxygen poisoning).

The underwater site Zhang Heng went to this time is about 25 meters deep. There is no danger at this depth. With Zhang Heng's water-based training in the copy of black sail, even if he doesn't have any equipment, he can dive to this depth in one breath. Of course, in that case, he doesn't want to stay down for long. Basically, he has to go back when he sees the site I'm breathing.

Strictly speaking, this is not Zhang Heng's first dive in Okinawa.

When he was a child, he followed his parents to see coral in Sanya, but it was pure parent-child leisure. The depth of diving was less than eight meters, and the time spent underwater was very short, only 20 minutes, accompanied by a coach.

To sum up, when Zhang Heng was wearing equipment to stay underwater for a long time or in Apollo training camp, NASA used the underwater environment to simulate weightlessness. Zhang Heng not only had to stay underwater, but also had to receive instructions from the console to complete a series of operations.

So back underwater, Zhang Heng doesn't feel strange.

Whether it's the feeling of weightlessness or the quiet underwater, the sea keeps almost all the sounds out. When diving, every diver can only hear his own breathing and exhalation, especially when exhaling, when bubbles pass through the sea and float upward, the sound is quite reassuring.

Nelly is as competent as she said. She always stays at the place no more than two meters away from them. She keeps a close eye on their physical and mental conditions. After confirming that they have not encountered any trouble in diving, she makes a gesture and points to the nearby relics to let them follow her.

In fact, it's hard to ignore the scene in front of her as long as she's in the water. This is a huge undersea palace or a pyramid shaped building. It looks very dilapidated from the outside. It is said that it can be traced back to about 10000 BC.

If we say that this undersea site was built by the people who lived here at that time, their production technology level may have reached the level of the Egyptians when they built the pyramids, but the latter happened around 3000 BC.

This is why many experts firmly believe that the building built by stones is just a coincidence of nature. However, after seeing the neat stone steps and the smooth square rock walls, Han Lu still prefers to believe that it is really a relic of some mysterious lost civilization.

She even saw traces of suspected gates and roads.

Nelly gestured to let Zhang Heng and Han Lu get closer, while she picked up the underwater camera to take a picture of them and the underwater relics in front of them, and then swam towards the gate.

Han Lu followed with a video recorder, while Zhang Heng looked at the time and direction on the diving computer, and then followed.

The three people went through the stone gate one by one. They said it was the city gate, but in fact it was just three pieces of stones put together. From time to time, leisurely tropical fish swam past Zhang Heng's eyes. In addition, Zhang Heng also saw a little sea hare.

This kind of marine creature, as its name suggests, looks like a cute little rabbit with ears (but there are many kinds of ugly sea rabbits). From Han Lu, a strong woman, to Nelly, a little girl, they can't carry this cute thing. They shoot around it like a photographer under the stage of Weimi.

It took about a minute to move on. Then the three swam through a narrow place. The narrowest place was only two people could stand side by side. Then the vision suddenly widened, like coming to the hall of the underwater palace.

Looking around, there are walls made of rocks, and the top of the head is sparkling water.

At the front, Nelly stops, folds her left and right hands together, and quickly swings her thumb up and down. This is to tell them that there are turtles to see in front of them. Han Lu swims over and sees two turtles in the crevice. So she waves to Zhang Heng behind, signaling him to catch up.

But Zhang Heng didn't seem to see her wave. He still stayed in the same place and seemed to be a little distracted.

I don't know why, at the first sight of the underwater site, Zhang Heng had a sense of deja vu in his mind. But at first, the feeling of deja vu was not too strong, but when he came to the open-air "Hall", the feeling appeared again, and this time, Zhang Heng knew where his sense of deja vu came from.He had a strange dream in the alien copy before. In the dream, he came to a gloomy seaside town. After collecting the shadow set, he came back to that seaside town again. That's what he felt at that time. Now, this feeling appears again.

Considering what happened in that small town later, it's not a good sign.

Although this diving spot is still well-known, it receives a lot of tourists every year, and so far no one has had an accident here, Zhang Heng doesn't want to doubt his instinctive perception.

After that, he gave Han Lu and Nelly a thumbs up and asked for a rise.

Nelly feels a little strange. She doesn't know why Zhang Heng suddenly wants to stop diving. She also wants to gesture to ask Zhang Heng what difficulties he has encountered. On the contrary, Han Lu is more experienced. After experiencing the death dream event with Zhang Heng, she has unconditional trust in Zhang Heng. She also knows that there is another more crazy and dark world hidden under the ordinary world I'm here.

Therefore, he didn't question why Zhang Heng made such a decision. Instead, he immediately made a firm upward gesture.

But then see Nelly's face suddenly changed, anxiously made a downward flow gesture.

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