After a certain discussion, the two of them dug a small hole in the cave wall with their swords, stored the materials for the time being, and then continued to explore the depths of the cave according to the information provided by the Flying Snake's flesh and blood. Pen "Fun" Pavilion www.biquge.info

This magma passage is not too steep, not only did I not encounter any magical beasts again, but I also did not encounter a single plant or insect. However, they found that the further down they went, the higher the temperature became, and they only walked a distance of less than a kilometer before the temperature rose by nearly ten degrees Celsius.

At this point, the magma tunnels become more complex, with transversely bifurcating junctions appearing from time to time, and there are more types of ore on the rock walls, with the occasional small piece of dark green copper ore being found.

However, most of the passages that branch out of the magma tunnel are very narrow, and people can't pass at all, and the few who can barely enter have to quit because they are getting narrower and narrower, and the last thing they can explore is still the magma tunnel.

As they probed further and further, the Heaven and Earth Vitality in the cave gradually changed, and the Vitality with the evil aura became smaller and smaller, but the total amount of Heaven and Earth Vitality gradually increased. It seems that the evil vitality is indeed gathered by the inverted pentagram, and there is indeed the source of the heaven and earth vitality in the depths of the earth.

They continued to descend, and when they reached a depth of fifteen hundred meters, the magma tunnel in front of them suddenly changed. They became bigger and steeper, almost perpendicular to the ground, like a bottomless well in front of them. Moreover, the bifurcations on both sides have almost disappeared, and the walls of the cave have become smoother, and there is no place to climb or land. Thankfully, they all have the ability to navigate the sky, otherwise the average spelunker wouldn't be able to continue exploring here.

Zhu Yan and Chen Lan both unfolded their spiritual senses, wanting to test the length of this magma tunnel, but they helplessly found that they couldn't perceive where its deepest part was, it seemed to be a bottomless pit. The scorching stinging air from its bottom, and the smell of sulfur, made them suspect that it might be the place where the underground magma is.

"Now, what to do?"

If you look any further, not to mention how many unknown dangers there are, let's just say that the scorching heat is enough to make people unbearable. But if you want to give up, the flesh and blood information of the flying snake shows that it came out of the depths of this tunnel, the cave where the Jiuzhi Returning Spirit Grass is located, and it is also in a branch under this tunnel.

Zhu Yan and Chen Lan glanced at each other, and then both jumped into the magma tunnel, no matter what, they wanted to explore as much as possible.

They plunged down the deep cavern, the heat rushing towards them, their hair curling, their clothes scorching, and every inch of their skin felt like they had been soaked in boiling water.

This can't go on like this! They were in touch, and immediately slowed down the descent and activated the spiritual cyclone to absorb the flooded vitality to lower the temperature around their bodies.

As the spiritual power cyclone accelerated, the Heaven and Earth Yuan Qi around them finally decreased a lot, and the temperature immediately dropped. At the same time, the burning pain on their skin gradually disappeared, and their hair and clothes were no longer curly and scorched.

In addition to these, Zhu Yan and Chen Lan were also pleasantly surprised to find that this cultivation speed was much faster than before, even faster than Zhu Yan's extreme cultivation method. It didn't take long for the spirit crystals in their spirit stove to increase by more than a hundred, and the spiritual space was greatly expanded.

Especially Chen Lan, the seed of the Soul Tree, which she had only sprouted recently, actually grew four leaves in a short period of time, and the seedling also grew more than an inch taller. In her memory, even during the time of Atlantis, the cultivation speed of human beings was nothing more than that.

"Could it be that this is the best place to cultivate?"

The two thought to themselves, but it didn't take long for them to discover what the problem was. As more and more vitality was inhaled into their bodies, the irritability and restlessness in their hearts became more and more intense, and even tyrannical and evil thoughts would flash out, which had never appeared in their previous cultivation.

Zhu Yan's perception was a little stronger, and he soon sensed that these Heaven and Earth Yuan Qi were not pure, but carried a small amount of evil or dark soul information, and once inhaled too much, it would affect people's minds, and even make people go crazy.

Of course, this question is not very confusing to him, because his mental space has already produced a purification ability, and it is a big deal to inhale all the vitality into the spiritual space, purify it into chaotic vitality and then absorb it. But for Chen Lan and other cultivators, it would not work if they had been cultivating here for a long time.

In addition, there was another problem, Zhu Yan also found that these Heaven and Earth Yuan Qi stimulated the activity of the body's cells, adding many unknowable dangers, even he was not immune.

After the Heaven and Earth Yuan Qi enters the cell, in addition to enhancing the repair ability of the cell to a certain extent, it can also speed up the speed of cell division and make the intracellular pressure become greater.

Obviously, these changes are good for the cells within a certain range. However, once this range is exceeded, the cell will divide and multiply indefinitely, and it will also become a cancer cell in medical terms. When the intracellular pressure increases to a certain extent, the person will even explode and die.

That is to say, if anyone wants to cultivate here, they must have two conditions at the same time, one is to be able to purify the evil vitality here, and the other is to have a strong enough physique. For Chen Lan, staying here for no more than an hour at most, and even for Zhu Yan, it was only two hours.

Time was pressing, and while they were trying their best to digest a large amount of vitality, they quickly plunged deep into the ground. Before they knew it, they had descended to a height of more than a thousand meters, and they were already more than 2,500 meters deep from the entrance of the cave.

The temperature around them had become very hot, and the temperature had exceeded 200 degrees Celsius a little further away from their bodies. It is conceivable that at this time, once they withdraw the exercises, they will immediately be roasted into two jerky, and they have been here for more than half an hour.

"Let's go back, maybe we should come back next time in heat-insulated clothing."

Although Chen Lan was still struggling to insist, Zhu Yan still decided to go back and talk about it, it was too dangerous for her to go on like this.

"Okay!"

Chen Lan knew her strength, so she didn't insist, she didn't want to be a burden to Zhu Yan.

Just as the two of them turned around and were about to return, Zhu Yan subconsciously scanned the bottom of the cave.

"Ah...... How is this possible? Are there plants down there? And critters? Hey, there's a huge cave on the side wall below? It seems that it is still an artificially dug passage? ”

Unexpectedly, his divine consciousness was swept away in such a hurry, and he made a huge discovery: at a depth of 2,500 meters underground, at a temperature of more than 200 degrees Celsius, there was actually life? There is also an underground passage that appears to have been dug by hand?

Chen Lan's divine sense also swept over when she heard the news, and soon even she was shocked to herself.

"Winged grass? Gold beetle? There's an elixir here! Underpasses? Could it be that the legendary underground promenade really exists? ＂

She exclaimed in surprise and joy, she had no idea that these two ancient elixirs, which had long been extinct on the ground, would appear thousands of meters deep. She didn't expect that after their adventure this time, they might actually discover the legendary underground corridor.

Either of these scenarios is enough to change the history of humanity and possibly even the future of humanity. If the elixir can grow here, it means that the formulas of various potions in Atlantis may be available here, and the fate of mankind may be changed because of this. The discovery of the underground corridor can directly confirm the creation legend of mankind, and perhaps solve many mysteries of disappearance in human history.

Zhu Yan was also extremely excited, these two discoveries could not only make the path of human awakening easier, but also verified his long-held conjecture that life could exist in places deep underground where there was no sunlight.

For a long time, scientists have believed that the survival of living things is inseparable from sunlight, and that the energy of living things comes from solar energy in the final analysis. But it was later discovered that the way for organisms to obtain energy is far more than solar energy, it can also be chemical energy, even geothermal energy, nuclear energy, such as the ocean bottom near the geothermal springs that do not see sunlight, there are rich biological communities.

Soon after, the underground scientific drilling engineering team of the Chinese mainland published a paper on the discovery of a large number of thermophilic microorganisms in the rock layer 2,000 meters underground. These "starving lives" that survive in extreme environments such as lack of oxygen and high temperatures rely on "eating" iron and methane to survive, which suddenly breaks people's traditional understanding that "there is no life in a stone".

Whether it is solar energy, chemical energy, geothermal energy, etc., the essence is the manifestation of the energy of heaven and earth. Therefore, as long as the Heaven and Earth Vitality is strong, no matter what form of Vitality it is, theoretically speaking, there can be a specific biome that can survive.

Now, the underground magma passage more than 2,500 meters deep has a large amount of high-concentration Heaven and Earth Yuan Qi from the underground magma layer, so it should also be able to support the existence of life. These underground beings must also use such heaven and earth vitality as their energy source, and they may directly have a nutritional method similar to "eating qi".

The so-called "food qi" is a term for cultivation, also known as "Bigu". When a practitioner is successful in cultivation, they can sustain their lives by simply absorbing the energy obtained from the Heaven and Earth Yuan Qi without the need for additional food intake, which is called "food qi".

Legend has it that the way the gods nourish is "food qi", and it doesn't matter to them whether they eat or not. In the Mayan manuscript, it is also mentioned that the Gendayans with a third eye do not need to eat, they can directly absorb cosmic energy, and apparently they will also "eat qi".

In fact, "food gas" is the earliest and most common way of nutrition in nature, for example, the photosynthesis of plants is essentially a kind of "food gas". The reason why humans and animals rely on ready-made food for nutrition is because the Heaven and Earth Yuan Qi in the surrounding air is too thin to meet their needs, and they only obtain relatively rich Heaven and Earth Yuan Qi from food.

"Existence is reasonable!"

Zhu Yan and Chen Lan didn't bother too much about this sudden underground life, and the most important thing for them at the moment was to decide whether to leave or stay. It is so unwilling to go, but it is so dangerous to stay, this is really a difficult choice.

(Make up for a change, there will be a change in the evening, ask for all kinds of support!) ）