Because he knew that there was no danger in this underground cavity, Tang Feng advanced extremely fast, and it took less than fifteen minutes to reach the end of the underground cavity.

The end of this underground cavern plunges straight underwater, and it seems that the magma passage made a 90-degree bend at this location. However, by this time, the magma had long since receded, and was replaced by a circular surface of water about 100 meters in diameter.

Through the star core, Tang Feng could clearly see that this downward extending magma channel was extending diagonally down to the depths of the earth's crust, which was more than ten kilometers deep. It's just that in the depths of the tunnel, the boiling magma has already condensed, turning into rock formations to completely block the tunnel.

More than 300 meters below the water level, there are several broken places in this magma tunnel, because these broken openings allow the tunnel to connect with the seawater outside, so there is seawater here.

Of course, all of this was seen through the star core, but in fact, it was a dark place, and no sight or sound could be seen or heard except in the area of the flashlight and the "whoosh" of the water in the dark river as it flowed into the waters.

Perhaps because the magma made a big bend here, the space above this body of water is very large, with a height of more than 50 meters, almost forming an almost semicircular dome above the water surface.

Tang Feng was very satisfied with this place, so he did not hesitate to place the batch of rough diamonds that had been stored in the star core for a long time in this place.

The conditions for the formation of diamonds are high temperature and pressure, and it is clear that this was once a magma channel, and the conditions for high temperature and high pressure are in place, so there is no problem in placing that batch of rough diamonds here. In fact, diamonds are often found in sedimentary rocks formed after some volcanic eruptions. Even the famous kimberlite was formed by magma intrusion.

Because only the intrusion of magma can form high-temperature, high-pressure, oxygen-free conditions, and it is possible to form diamonds.

In the past, it would have taken almost two hours for the star core to place a vein, but after the star core was upgraded to a complete body. This time is greatly reduced. This placement of those rough diamonds stored in the star core was the first time that the star core was placed in the veins after it was upgraded to a complete body, but it only took less than half an hour.

1.6 billion carats may sound like a huge amount, but in fact, if you want to convert it into tons, it is only 320 tons, which is less than 100 cubic meters in volume. Even on the rock walls in this vicinity, even all the rock walls are not covered with anything.

But even so, Tang Feng was already very satisfied. When this place is developed in the future, it will definitely become a "diamond palace" that will make any woman crazy.

Although the rough diamond is not as dazzling as the cut diamond, under the illumination of the strong light, the rough diamond is still very beautiful, not to mention that the rock wall of this space is basically covered with rough diamonds. Now I'm drunk just thinking about it

However, there is such a precious rough diamond here. Then the security work here must be done well, at least this area is absolutely forbidden to ordinary people. Anyway, in the near future, Tang Feng does not plan to mine these rough diamonds, and when Sophia has seen enough, it will be too late to mine them at that time.

Tang Feng is not short of money now, since he started a full-scale cooperation with Glencore Strata a few months ago. With the help of Glencore Strata's sales channels around the world, the shipment of mineral products from the mines under the name of Tang's Anglo-American Group has increased significantly, coupled with the success of Ichiro Tanaka's sales strategy in Yuben, Tang's Anglo-American Group's minerals have now become a significant force in the mineral market.

A large increase in sales means that the speed of capital return increases, most importantly. The mining costs of these mines under Tang Feng's name are extremely low, and Tang Feng's mine sells one ton of ore, which is almost the profit created by others selling four or five tons of ore, so except for a very few people, others have no idea how crazy Tang's Anglo-American Group is now plundering wealth all over the world.

Ben, European countries, and even the United States can now be called Tang Feng's ATM!

Therefore, although the value of this gem-quality rough diamond of up to 1.6 billion carats is extremely high, there is really no need to mine it for Tang Feng now, after all, there are still several diamond mines with low mining costs under the name of Tang's Anglo-American Group, and the output of these diamond mines is enough for Tang Yun jewelry.

After arranging things here, Tang Feng didn't ask Camilla and them over the walkie-talkie. Since Tang Feng turned the vicinity of that body of water into a veritable "Diamond Palace", that area has become a forbidden area.

Tang Feng didn't care about those diamonds, but I am afraid that no one else could resist the temptation of those diamonds. So, it's best to simply not let them see it.

Wait until you get a mud pump and get some mud from the outside, spray the rock walls of the area with mud, and then renovate it, so that you can hide the presence of those rough diamonds. After the renovation is completed, the covered mud is washed off with clean water, so that the confidentiality is not a big problem.

Besides, most of those rough diamonds were placed on the rock wall more than four meters above the ground by Tang Feng, as long as the discipline was emphasized during the decoration, and tools such as ladders were not allowed to enter this area, it is estimated that no workers are idle to play rock climbing here.

Don't forget, there are also overseers during the renovation, and when the time comes, it will be even more foolproof to transfer the hyenas to be overseers.

It was with this idea in mind that Tang Feng returned to the entrance so reassuringly. By this time, more than a dozen employees had already descended from the hole along the ropes, and some tools and other things had been brought in from outside.

Tang Feng pulled Camilla and whispered: "Tell the workers in a while, it is strictly forbidden for those workers to go to the east without permission, and if they find one, they will be fired." I'll be here for a while, you go up, let the staff prepare some monitoring equipment, and install the monitoring facilities first, even if it's temporary, just to prevent people from going there without permission. Camilla, it's important, you have to do it. ”

Tang Feng's tone made Camilla a little nervous, maybe this guy thought of monsters such as Godzilla from Tang Feng's words, but Tang Feng didn't explain anything, but waved his hand and asked him to prepare those things.

Seeing that Tang Feng was still sitting here, Camila seemed to understand something again, and hurriedly returned to the ground to prepare those things. (To be continued.) )