Like all the other tunnels, Tunnel 13 was dug down a natural crack, and everything was fine until the depth of the 22,000 kilometres was reached, when strange things began to happen.

Although the existing technology can not accurately detect the clear stratum situation, but the most basic detection still has to be done, the most commonly used method is to directly transmit high-frequency sound waves to the ground, through the reflection of the stratum to judge the underground structure, this method is the simplest and direct, but the occasional metal veins or radioactive materials will affect the results of the judgment.

At first, no one paid much attention to Drill Track 13, until an anomalous discovery occurred during an exploration, and the explorers thought that the machine had appeared as a gift to him, but after countless repetitions, they still got the exact same answer - a large unidentified reflection area appeared under this tunnel.

At first, we thought that there was a very pure metal layer buried here, but using other detection methods, we also got the same result, even if the laser was fired downward, the laser beam did not respond when it reached the area, as if it was completely absorbed or trapped inside...... Black holes, which feel like black holes, are an undetectable and extremely dangerous region.

Soon the thirteenth drill tunnel was closed, so no one was allowed to enter here, however, some of the high-level executives in charge of the entire project were very interested in it, and believed that the unknown reaction must be directly related to the "eggs" in the earth's interior.

It took about a month, the drilling team small and careful peeled off the upper layer of strata, and found the anomalous area, which is a huge cavity, about two kilometers in diameter, in that cavity area, any sound waves and spectral detection will be completely absorbed, no reflected light, it means that we can't see it, it really looks like an underground black hole, but it has no mass, and it has no impact on the outside world. Bypassing it and digging into the rock formations below, everything is normal again.

We tried to dig the drill bit into the hole, and something even more bizarre happened, no matter how it was operated, the drill bit did not respond, that is, it was connected with wires, and the hole would still be separated from all the incoming things from the outside, and the detector tied to the drill bit could not find anything......

With our current technology, it is completely impossible to study the cavity, and for fear of uncontrollable consequences if the excavation continues, the No. 13 tunnel is completely closed, the top of the tunnel is sealed with special materials, and all the facilities inside are withdrawn, and if it were not for this accident, it may have been sleeping for many years......

After Nina said everything about this tunnel, it was indeed very bizarre, some of it was confidential information, plus the exaggeration of word of mouth, I don't know how much else was credible, except for these parts of adding oil and vinegar, at least we could know that there was indeed an anomaly under the thirteenth tunnel.

"Wait...... Have you ever thought about a possibility. Mark felt a flash of inspiration run through his head, and as he listened to Nina's story, he had a feeling of inspiration, and now it was even more pronounced, and he struggled to capture it.

Lava, strata...... Crack...... Civilization Egg ...... Mysterious Space ......

"What if ......" Mark suddenly sat up from the ground, he trembled with excitement, like a man in the water who had grasped the last straw: "What if we restart the drilling, increase the horsepower, and directly penetrate the main tunnel, so that the fractured formation is connected to the thirteenth tunnel, and a large amount of oozing magma will be injected into the mysterious cavern." ”

"It's absolutely not going to work!" Nina exclaimed, "It's just a space with a diameter of two thousand meters, how can it hold so much magma, and the strata outside are already very fragile, and another earthquake may induce a volcanic eruption in advance...... The people outside certainly haven't evacuated yet. ”

"The situation couldn't be worse, I think we can still give it a go......" Mark patted the dirt on his body and stood up, confident as he regained his direction: "If that hole is really related to civilization eggs, it must not be so simple, maybe it leads to a larger space." ”

"Are you really going to do that? To open a channel of this size, at least three rigs need to be started at the same time, and the permissions must be turned on, and the overload mode must be activated, and I am not sure that the power above has not been interrupted......" Nina panicked, thinking about it carefully, and found that although Mark's plan was crazy, it was not impossible to achieve.

"Now is not the time to look ahead, you teach me how to do it." Mark said firmly.

"The temperature in the main drill track outside is at least 2,000 degrees, and we have just seen the explosion! Have you forgotten? ”

"We just fell off the top, and you forgot?" Mark smiled and tugged at the protective suit on his body: "Although I don't know what its limit is, I want to fight, even if I can't come back alive, I will fight to the last breath...... All three rigs were turned on, but could a normal drill bit resist the erosion of magma? ”

"Ordinary tungsten gold drill bits simply can't withstand this kind of high temperature, but the main drill has three nanoalloy drill rigs installed on it, which are made of high-strength materials used in space elevators, and maybe they can be tried, but they are all newly installed, have not passed the test, and have not been put into use." Nina was a little worried, but she already approved of Mark's plan in her heart.

"Isn't there now the best time for it to be put into service?" Mark was ready to try.

"Let's make a detailed plan." Nina sighed, and finally chose to believe him, the two of them have gone through so many life and death trials together, and the bond between them has turned into an unconditional trust.