At about the same time as Sun Tan's discovery of the microcosm, two new mysterious cavities were unearthed on Earth, which, like the one found under the Antarctic volcano, were undetectable and inaccessible, and the time inside was almost completely static, except that it had no effect on the outside world, it was completely a miniature black hole.

The strata found in these cavities are also at the same depth, about 20,000 meters away from the surface, and their size is also very different, the largest is the one found under the Antarctic underground, with a diameter of 2,000 meters, and the smallest is found under a drilling well in South Africa, with a diameter of only 30 meters.

This is undoubtedly an astonishing discovery, human beings have lived on the surface of the earth for so many years, and they have not yet discovered that there is such an amazing secret hidden under their feet.

And the first person to take advantage of these cavities, who saved the entire Sector 6 infrastructure and volcanic super-drilling with underground cavities, is now lying in the intensive care unit for treatment.

Mark's situation was not optimistic at this time, the moment the work platform fell, he was hung on a broken stand on the rock wall, and only a little distance away, he would have fallen into the scorching abyss below, if that was the case, no high-tech protective suit could save him.

In order to protect the user's life, the protective suit began to release the protection of some non-lethal areas, in order to protect important parts, it is precisely in this way that Mark can hang on the rock wall for so long.

When rescuers rescued him, he had already fainted, his limbs had been severely burned, his skin and muscle tissue were severely necrosis, and even if he was out of danger, he would have serious sequelae and damage for the rest of his life.

It has been three days since he was rescued from the super drill, and Mark is still in a coma, in contrast, Nina is much luckier, she was actually staying with the intention of sending him to death, and she has given up resistance after opening a few valves underground, there is no possibility of survival in such an extreme environment, she knows this very well......

Maybe it was the last glimmer of hope for survival, maybe it was just curiosity, or maybe she was already delirious at the time, and Nina also forgot what kind of psychology she had at that time, she did not leave the thirteenth drill tunnel after opening the valve, but walked to the bottom along the engineering ladder left before, and it was this unintentional act that saved her life.

Beneath this mysterious hollow...... The temperature is very low!

It was as if some special barrier had kept it out, and no matter how much the temperature outside had risen, the temperature below the cavern was still in the thirties of the sky, and Nina even sneezed at the time, and the place was as cold as an ice cellar compared to the top.

Nina has been hiding under the cavern waiting for rescue, the magma poured from above sealed the exit above, but I don't know why it has not penetrated into the bottom of the cavity, in this area where the temperature has fluctuated, as if there is some invisible barrier, Nina is puzzled, everything that happens here is far beyond her comprehension, and she can't even understand it with common sense, here...... The unbreakable iron rules of the universe seem to have been subtly adjusted.

She survived with the two cans of oxygen stored in the protective suit, and kept calling for help with a miniature communicator, and when the oxygen was about to run out, the rescue team finally arrived and rescued her from below, and after entering the lower level of the mysterious hollow, all the rescuers without exception let out an exclamation, and they could also feel the temperature change through the protective suit.

The specific principle has not been explained, the only thing that can be determined is that the creation of these mysterious voids must be related to the civilization eggs buried in the interior of the earth, when it will be taken out and thoroughly studied, when will the strange phenomena caused by these mysterious holes be explained.

People rescued from the ground are generally afraid of the sun, and because they are not used to the sudden bright light, people's eyes will not be able to stand it, so when she is rescued, she is lying on a stretcher, and her eyes are covered with black cloth. Nina was trapped in the pitch black underground for thirty hours, and after the magma poured into it solidified, there was no light source below, as if she had been buried alive underground, with nothing but endless darkness...... Theoretically, she should have been more afraid of the sun when she came out, after all, she had seen the sea of magma and fire, seen the blazing flames that destroyed everything, and realized that the power of such a powerful flame existed not only in the stars above the sky overhead, but also in the churning center of the earth beneath our feet.

But she was the opposite, after being carried out of the facility, Nina reached out and ripped off the black cloth on her face, the sun shone on her face, the light of the new sun was whiter than the original, her beautiful brown eyes stared at the hot star like this, and the medical staff around her had no time to stop her, only to see her eyes when she looked at the sun, like a great wise man who had transcended the world.

After such a life-or-death ordeal, Nina was even more determined to spend the rest of her life here, and she would devote all her energy and knowledge to it as a determined navigator to guide people to explore the center of the earth. This incident was a training for her, and now she was reborn, and the fear and confusion in front of her eyes had disappeared like a cloud of smoke, leaving only a determination as strong and shining as steel.

"Mark is awake!" An exclamation of surprise dispersed through the crowd, and Nina, who had been sitting in the hospital corridor, bounced up from her seat and strode towards Mark's intensive care unit.

"How's he doing now?" Nina asked as she pushed through the crowd of people who came to visit, and the surrounding medical staff were also blocking the crowd who wanted to enter the ward, and the guards had already prepared and walked over to set up a guard.

"It's still unstable, temporarily out of danger...... "The medical staff scanned the crowd and said with some embarrassment: "But when he woke up, he said that he wanted to see Miss Nina anyway, and you can talk through video call, come here." ”