Only Chen Rui knew that under the calm and waveless sea, there was a strong murderous intent.

Chen Rui plans to go back and enter the submarine pit again to investigate.

Because Chen Rui can be very sure that the deep cave under the sea must have been dug by a prehistoric cultivation civilization.

Otherwise, it was difficult to understand that at the bottom of the pit there was such a concentration, equivalent to the concentration of the spiritual energy accumulated by more than a dozen spirit gathering arrays.

Moreover, in the process of Chen Rui's first dive to the bottom of the pothole, he found that the pit was in the shape of an inverted cone, and there was a 5 or 6 meter wide road carved into the cave wall, spiraling downward, and trucks could drive through the 'road' to the bottom of the pit more than 300 meters deep.

On the wall of the cave, Chen Rui found traces of artificial excavation and excavation, full of very disorderly cutting marks, excavated pits, and caves extending parallel to a depth of several meters to more than ten meters.

All indications are that this is not a naturally occurring pothole, but a man-made and excavated pothole.

It makes Chen Rui feel a bit like a diamond pit in Siberia, Russia.

Chen Rui was very curious about what the purpose of the prehistoric civilization was to dig this pit at the bottom of the sea at a depth of more than 6 to 700 meters.

You know, at such a deep seabed, it is very difficult to dig such a large and deep hole.

The discovery of this submarine crater made Chen Rui truly realize the mystery and unpredictability of the sea.

The sea is mysterious.

Although there are many countries where submersibles can reach 99% of the seafloor, human knowledge of the seafloor may be less than 1%. It is a forbidden area for humans, and human knowledge of the deep seabed is very limited. In the deep sea, there are still many unsolved mysteries.

There are many legends about the sea.

For example, the architectural ruins of prehistoric civilizations on the bottom of the sea, the pyramids under the sea, the UFOs on the bottom of the sea, the people living on the bottom of the sea, and so on.

Chen Rui hopes to explore the deep seabed, a forbidden area for human beings in the future. This is very challenging for Chen Rui. It's a very prickly, exciting, and very rewarding thing.

Chen Rui hopes to solve the countless unsolved puzzles generated by mankind's continuous exploration and understanding of the ocean.

Cultivating the Immortal Cultivation Method, Chen Rui could crisscross the sea, and could easily dive to the bottom of the deep sea that humans had never reached. A no-go zone for humans.

Chen Rui drove the speedboat back to the sea full of danger and murderous opportunities.

The yacht stopped in the sea above the potholes in the seabed.

Chen Rui jumped into the sea and dived to the bottom of the sea.

More than ten minutes later, Chen Rui stood in front of the mouth of the submarine pit again.

Look at the deep, dark pit beneath your feet.

Chen Rui knew that at the bottom of the crater, a few hundred meters below the crater, was entrenched a huge Atlantic sea monster.

Chen Rui did not sneak into the pit this time as he did when he entered the pit for the first time.

Chen Rui used the earth escape technique, and the person turned into an earthy yellow phantom, and the earthy yellow virtual film and television showed that the real substance was like nothing, and sank into the ground in violation of the principle of matter.

After Chen Rui sank into the ground, he kept drilling down.

Suddenly. Chen Rui found some crystals underground.

The crystals are colorless and transparent, and the texture is very hard and smooth. Crystal.

Chen Rui took these crystals and entered the space of the pregnant sea pearl.

Holding the spar in his hand, facing the sunlight in the space of the pregnant sea pearl, the sunlight reflects the spar in a colorful way, like the color of the rainbow, dazzling and colorful.

Chen Rui can clearly see the inside of the crystal, which is made up of very small pieces. But it is composed of small crystal particles of various shapes that can be seen with the naked eye.

It's amazing.

Chen Rui had 5 such spars in his hand.

The small ones are the size of a thumb.

The big ones are the size of eggs.

Chen Rui didn't know what this crystal was called.

However, Chen Rui could guess that the prehistoric cultivation civilization of the earth had dug this hole at the bottom of the sea with a water depth of 6 to 700 meters. It is quite possible that such crystals were excavated.

It's like Russia digging a 'peaceful' diamond pit in Siberia just to dig up diamonds.

Chen Rui estimated that he had drilled about 3 to 400 meters underground, about the same depth as the bottom of the pothole.

In the process of Chen Rui's underground drilling, he could find this crystal from time to time, and by this time he had found more than a dozen.

Chen Rui put this crystal into the pregnant sea pearl.

Chen Rui penetrated the soil layer.

Chen Rui was surprised to find that he did not appear at the bottom of the pit as expected, but entered a cave.

The cave is connected to the bottom of the pit.

The cave is filled with seawater.

Here, the water depth has exceeded more than 1,000 meters, and the surrounding sea water has brought a lot of squeezing force to Chen Rui.

The cave was pitch black, and you couldn't see your fingers.

Chen Rui took out the waterproof mineral lamp from the pregnant Haizhu space.

I took a look around the cave.

Chen Rui found that this was a large cave, with an area of several hundred square meters and a height of more than 10 meters.

The cave is an artificially dug cave, Chen Rui can say with great certainty.

The light shone on the cave wall and the top of the cave, and Chen Rui could find that the wall and roof of the cave were very flat, and there were traces of being cut by sharp weapons.

Stone slabs were laid on Chen Rui's feet, which were unconventional.

Chen Rui felt that this cave was a bit like an oversized matchbox.

In the center of the cave, there is a platform.

Chen Rui swam over.

Chen Rui found some grooves on the platform.

Each groove is inlaid with a crystal, which is somewhat similar to the crystals that Chen Rui found in the underground rock layers.

It's just that these crystals are not colorless and transparent, but come in a variety of colors, including azure blue, earthy yellow, and fiery red.

These crystals are arranged in a special sort of arrangement.

Each crystal is the size of an egg.

The crystals in the middle are the size of a fist and are blue, and if you look closely, you can see that there is a flowing substance surging inside the crystals.

Chen Rui could clearly feel that the matter constantly surging in the crystal was a very large energy substance, and if these energy substances were detonated, the power of the instant explosion would be very huge.

Chen Rui had arranged many Spirit Gathering Arrays, and he had some understanding of the formations.

These crystals are arranged in a special order that behaves like a formation.

It works like a formation, but it's not a formation.

However, Chen Rui knows too little about this device, so he can't think of a better name, so he guesses it's called a formation.

Egg-sized crystals form the nodes of the formation, and the blue crystal in the middle and the size of a fist is the hub of the formation.

It's a circular formation.

While absorbing the aura contained in the seawater, it is released, and the inhalation and exhalation maintain a very relative balance.

The source of the rich aura contained in the sea water in the nearby sea is all derived from this.

The aura spewed out by the formation benefited the creatures in the nearby seas. (To be continued)