In the depths of the ocean, a huge sphere floats.

The sphere resembles a music box and emits wisps of light that attract the surrounding fish.

Just as some of the fish were about to get closer to the sphere and want to get a closer look, the water around the sphere suddenly began to roll violently.

Immediately after, the unknown orb began to sink wildly.

"Team Leader Su, the undersea hollow city has now sunk to the bottom of the sea for nine hundred meters, the air pressure is normal, the temperature is normal, and all kinds of instruments are within the normal range."

Inside the main control of the Undersea Hollow City, Su Han heard such a report, and a glimmer of light flashed in his eyes.

Nine hundred meters under the sea is already a relatively deep position.

At this depth, there is no way for human beings to survive without the help of tools.

But now Su Han's state is very relaxed, as if he is on land.

In other words, a depth of 900 meters cannot affect half a point of the Hollow City under the sea at all.

Of course, Su Han's expectations for the undersea hollow city were far from that.

"Keep sinking!"

As soon as Su Han's order was issued, the undersea hollow city did not stop for a moment, and continued to sink.

1,000 meters, 1,500 meters......

As the speed of the undersea hollow city sank faster and faster, the breathing of everyone in the undersea hollow city became rapid.

As the Hollow City sinks faster, there is less oxygen below it, and the pressure increases.

Despite the fact that the Underwater Hollow City is made of special materials, it is still difficult to break the conventions of nature.

Finally, when the underwater hollow city sank to two thousand meters, some scientists with poor physical fitness fell directly to the ground.

"It's not good, Qin Lao has fallen."

I don't know who shouted such a sentence, which immediately caused a commotion.

Seeing this, Su Han immediately stopped the Underwater Hollow City.

Qin Lao, who was helped up by Su Han, smiled bitterly: "When you are old, your body is still useless after all. ”

"Elder Qin, I'll let someone help you to the rest cabin and go to rest immediately!"

In order to prevent emergencies, Su Han deliberately opened up hundreds of rest cabins in the undersea hollow city.

These pods are made of special materials that will not be affected no matter how deep the Hollow City sinks.

Qin Lao knew that with his physical strength, there was no way to hold out until the end of the undersea hollow city test, so he had to sigh lightly, let the staff support him, and walked in the direction of the rest cabin.

Seeing Qin Lao leave, Su Han did not start the experiment immediately, but said with a wry smile: "Everyone, I know that you really want to participate in this experiment in person and get some data you want from it, but because the ultimate goal of the undersea hollow city is 10,000 meters under the sea, I hope you don't hold on, if you are unwell, please go to the rest cabin to rest immediately." ”

10,000 meters under the sea!

Hearing this number, the scientists, who had originally planned to hold on, showed a wry smile on their faces.

Although they would love to go through this experiment and get the data they wanted.

But they are also self-aware.

Not to mention 10,000 meters under the sea, even if it is a little lower, I am afraid that my body will not be able to bear it.

Thinking of this, several older scientists stood up and said with a wry smile: "Team Leader Su, since this is the case, then we will go to the rest cabin to rest." ”

"But you have to promise us that when a trial is over, the data must be delivered to us as soon as possible."

"Only then will we have enough time to improve Sky City."

Su Han looked at the unwilling scientists in front of him and nodded slightly: "I promise you that the data will be sent as soon as possible, and there will be no mistakes that will affect your work." ”

Soon, dozens of scientists were sent back to the rest cabin by Su Han.

At this time, there were some young and strong 'students' left in the main control room of the Underwater Hollow City.

These students were brought out by dozens of scientists, and although they did not make any great achievements in the scientific community, there was still no problem in recording some data.

Everything was ready, Su Han's eyes froze, and he said in a low voice: "The Undersea Hollow City continues to sink, and this time the purpose is five thousand meters under the sea." ”

In the depths of the sea, a roar sounded.

At this time, the undersea hollow city was like a deep-sea beast, sinking crazily.

2,000 meters, 3,000 meters...... It wasn't until five thousand meters later that the Underwater Hollow City finally stopped.

In the main control room, Su Han found that the staff present were a little pale and breathless, and a trace of worry flashed in the depths of their eyes.

This group of staff members is carefully selected, and there is absolutely nothing to say about their physical fitness.

But even they felt extremely uncomfortable in this 5,000-meter deep sea, what about the ordinary people of the Dragon Kingdom?

"It seems that we must find an opportunity to strengthen the physical fitness of the people."

Su Han muttered silently in his heart, turned around, and said to the batch of 'students' who recorded the data: "Leave the rest to me, and you will also rest in the rest cabin." ”

Some students were still a little unconvinced when they saw Su Han, who had a normal face, and were about to hold on, but before they could open their mouths, they only felt that their eyes were dark, and they fell into a coma.

Looking at the several 'students' who fell to the ground, Su Han waved his hand and said helplessly: "Okay, okay, don't hold on here anymore, so as not to delay the experiment of the Underwater Hollow City." ”

Since Su Han has said this, if they are still reckless here, it will be a little too uninteresting.

Ten minutes later, the 'students' who were a little less physically fit were sent to the break room by special staff.

When the scientists saw that their students were also sent to the lounge, they couldn't help but exclaim: "Why can't you bear it?" You're not here, who's going to do the data for this trial? ”

A pale student gasped and said: "Teacher, it's not that we don't want to test together, it's really that we can't bear it, you also heard it just now, Team Leader Su plans to dive to the bottom of the sea for 10,000 meters, with our little arms and legs, it is impossible to bear it." ”

"And Team Leader Su also said that he will complete the rest of the data."

"You fart!" When the teacher of the student who spoke heard this, he became excited: "How huge the data of this experiment is, do you know, how can it be recorded by Team Leader Su alone." ”

"Lao Li, don't be so excited, since Team Leader Su dares to say this, then he must have a way."

"There is a way to ......" Lao Li was about to scold, but suddenly found that it was Qin Lao who spoke, and immediately nodded: "Since Qin Lao has said so, it seems that Team Leader Su does have this ability." ”

“……”

Inside the main control room of the Hollow City under the sea.

After everyone rested, Su Han ordered again: "Continue sinking." ”

The surrounding staff saw that Su Han did not have anything abnormal, and a trace of admiration flashed on their faces.

The reason why they can be calm in the environment of 5,000 meters under the sea is because they are the elite of each army.

Physical fitness, of course, has nothing to say.

But in this case, Su Han can still keep his heartbeat unchanged.

It can be seen from this how strong Su Han's physical fitness should be.