48 Hours a Day

It is June and the sun is still plentiful, so the three of us felt a little bored in diving suits when we were on the boat, but when we got into the water, the bored heat disappeared, especially as the depth increased and the temperature began to decrease.

Because the thermal conductivity of water is much higher than that of air, and the loss of heat in water is greater than that on land, but it is good that there are diving suits to protect against the cold, and recreational dives like this do not dive too deep, because due to pressure, one atmospheric pressure increases every 10 metres into the water, and after more than 30 metres, there is a risk of nitrogen intoxication (the normal recreational dive cylinder is mainly filled with compressed air, i.e. 21 per cent oxygen and 79 per cent nitrogen, which blends nitrogen into the body, and oxygen breathing at the same high pressure can cause oxygen poisoning for too long).

Zhang Heng's underwater site is about 25 meters deep. There is basically nothing dangerous about this depth. Zhang Heng exercised his waterability in the black sail copy. Even if he did not carry any equipment, he could dive to this depth with a single breath. Of course, he will not be able to stay down there for long. Basically, if he sees the ruins, he will have to go back to ventilation.

Technically, this visit to Okinawa was not Zhang Heng's first dive.

When he was a kid, he followed his parents to Sanya to see the coral, but it was pure parent-child relaxation, diving less than eight meters deep, and staying underwater for only twenty minutes, accompanied by a coach.

In fact, when Zhang Heng was dressed in gear for a long time underwater or in Apollo training camp, NASA used the underwater environment to simulate weight loss. Zhang Heng not only stayed underwater, but also had to receive instructions from the console to complete a series of operations there.

Therefore, Zhang Heng did not feel strange when he returned to the water.

Whether it's the feeling of weightlessness or the silence underwater, the sea water isolates almost all the sounds, and it's reassuring that every diver can basically only hear their breath and exhale when they dive, especially when the bubbles pass through the sea water when they exhale, and when they float up.

Nellie was as competent as she said, always staying no more than two meters away from them, closely watching their physical and mental condition, confirming that they did not encounter any trouble while diving before making gestures, pointing to the remnants not far away, and letting them follow her.

It's hard to ignore what's in front of you as long as you dive in. This is a huge undersea palace or pyramid-shaped building, externally ruined and said to date back to about 10,000 BC.

If this seabed site was built by people who lived here at the time, then their level of production technology may have reached the level of the Egyptians at the time of the pyramids, which, you know, occurred around 3000 BC.

This is also why many experts firmly believe that this building, raised by stone barriers, is simply a coincidence of nature, but Han Lu is more willing to believe that this is truly a relic of some mysterious lost civilization after witnessing the neat stone steps and smooth, right-angle rock walls.

She even saw signs of suspected doors and roads.

Nellie made a gesture to get Zhang Heng and Han Lu closer, while she picked up the underwater camera to help them merge a shadow of the seabed ruins in front of her and then swimmed over to the gate.

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

The three men went through the stone door in turn, saying it was a city gate, but in fact it was just three pieces of stone put together. During this period, there were occasional leisurely tropical fish swimming in front of Zhang Heng's eyes, in addition to Zhang Heng also saw a little sea rabbit.

This marine creature, as its name suggests, looks as cute as a little rabbit with only ears (but it doesn't rule out an ugly hare, which has a variety of things), goes up to a strong woman like Hanlu, and goes down to a little girl like Nellie who can't hold this cute thing for sale, and shoots around it like a photographer under Vimy's desk.

The delay lasted about a minute before moving on, after which the three of them swam through a somewhat narrow section, the narrowest of which was probably just two people in line, and then suddenly the view widened, as if they were in the lobby of this underwater palace.

Looking around, it's a wall made of rock, and the top of your head is a sparkling water.

Nellie, who was leading the way in the front, stopped her body and stacked her left and right hands together, swinging rapidly up and down her thumb. This was to tell the two people that there were sea turtles in front of her to see. Han Lu swimmed over, and she saw two sea turtles between the stone stitches, so she also waved to Zhang Heng behind her, indicating that he would follow her quickly.

But Zhang Heng, like he didn't see her wave, still stayed where she was. He seemed a little crazy.

Somehow, the first time I saw this underwater site, Zhang Hengxin flashed a feeling of acquaintance, but at first the feeling of acquaintance was not too strong, but when I came to this open-air “lobby”, this feeling reappeared, and this time, Zhang Heng knew where his sense of acquaintance came from.

He had a strange dream in a heterogeneous copy before, in which he came to a gloomy beachfront town, and when he gathered the shadow cover, he went back to that beachfront town again, and that was how he felt at the time, and now it's happening again.

That is not a good sign, considering what happened in that small town.

Although the dive site is quite famous, there are a lot of visitors every year, and so far no one has had an accident here, Zhang Heng does not want to doubt his instinctive perception.

Afterwards, he resolutely raised his thumbs to Han Lu and Nellie, demanding an ascent.

Nellie felt a little strange, wondering why Zhang Heng suddenly wanted to abort the dive, and wanted to make gestures to ask what difficulties Zhang Heng encountered. On the contrary, Han Lu was more experienced. She and Zhang Heng had unconditional trust in the latter after the Death Dream incident, and also knew that there was another, crazier and darker world hidden under the ordinary world.

Therefore, instead of questioning why Zhang Heng made such a decision, he immediately and resolutely made the rising gesture.

But then Nellie's face suddenly changed and she made an anxious downstream gesture.