Rock cracks, faults, or natural grottoes and caves may form areas where water bodies are drained.
If you are lucky, you can even find caves and tunnels leading to the outside world from those places. This is the hope of life.
In fact, there is hope in the water. The earth's crust is by no means sealed. Those water holes that can be seen from the outside must have cracks that lead directly to the water layer.
The only uncomfortable thing is that most of the cracks are too thin and narrow to accommodate an adult's body. Really large enough rock formation tunnels, cracks, and caves require some luck.
"Your idea is very smart, but one thing you don't seem to have considered thoroughly. Even if we find a space in the underground rock formation that is not filled with water, unless there is a crack in that place that is connected to the outside world, there will be no air for us.
Breathe." Ye Shenyu thought for a while and couldn't help but shake her head.
In a desperate situation, this guy thought of the most rational step, but this idea seemed to be inherently flawed.
If the underwater rock space is isolated from the outside world, there should be no nourishing energy for breathing.
If you are unlucky, the cave that appears may even be filled with methane and natural gas.
"Haha, you are right to worry, but I have a way to do this. If there is no oxygen, we will make our own oxygen to breathe. The key is to first find an area where the water is drained. It doesn't need to be too big. A few cubic meters of space is enough." Yang
Di smiled.
"Create oxygen?" Ye Shenyu was surprised, "What is it used to make?"
"Water." Yang Di said.
"You want to use electrolysis?" Ye Shenyu felt incredible. This guy really had wild ideas. In such a dark and desperate situation, he could even think of ways to create a chance to breathe.
"That's right." Yang Di admitted.
"Do you know the magic of thunder and lightning?"
"Yes! Although it's not too strong, the electrolyzed water is more than enough."
"Then it seems that we really still have a chance to survive the desperate situation." Ye Shenyu sighed, and couldn't help but admire this guy for even thinking of such a method.
How to breathe is the most severe survival challenge that the two of them currently face. Even a strong person in the Yunsha realm can only hold his breath for three to five days at most if he has plenty of energy.
This is almost the limit. If it exceeds the limit, the monk will also be dizzy. At that time, death will come to the door.
Of course, there is no need to worry about thirst when you are underwater. There is fresh water all around. As for hunger, it is better. Even if you don't take the elixir, with their cultivation, they can be hungry for a month.
Of course, if you really starve for a month, you will be almost skinny and limp...
…
This kind of drifting in the darkness is dull and depressing. The senses are trapped in the cold darkness for a long time, and even the heart will become cold.
Yang Di and Ye Shenyu should really be grateful to have each other now. The water flow has slowed down, and the surroundings are dark and quiet, as if they have been exiled to the edge of the universe. Without a partner, no one can stand it, because everyone
Everything is unknown and dark, and we don’t know where it will drift.
Perhaps it is precisely because they rely on each other that this quiet drifting is boring, but both of them are extremely patient.
In the invisible underground water layer, there is also no concept of time, and one can only rely on consciousness to figure it out.
Yang Di and the two felt as if they had been drifting for more than two days. Gradually, the surrounding water flow became slower and slower, and the water pressure did not increase significantly.
This means that they have entered the bottom of this underground water area and are probably very deep from the ground.
The nearby hydrology and geography are very complicated. If you look out with your spiritual sense, you can detect many criss-crossing caves, caves, and stalactites.
But those grottoes and caves were almost filled with water, which could not meet their conditions.
"Let's go! Let's look in that direction." Ye Shenyu sensed it for a long time, took Yang Di's hand, and swam in a direction in the darkness.
Since the water flow is now very slow and there is not much fluctuation, if their limbs do not move, they will be almost motionless at the bottom of the water.
Of course this is not possible. Staying at the bottom of the dry water is equivalent to waiting for death. The water flow has stopped, and they must swim to find a place where they can take a few breaths.
After more than half an hour, after swimming for several kilometers in this underground water area, Ye Shenyu finally sensed an empty area nearby, and when he explored it with his spiritual sense, it was like a big bubble in the underwater world.
That's probably a cave.
Both of them were surprised, and they quickly swam away. After a while, they touched the entrance of an underwater tunnel.
The inside of this tunnel has been filled, but Ye Shenyu's keen spiritual sense can feel that there is a space above the end of the tunnel tens of meters deep, which should be filled with a lot of natural gas and methane, so
A large cave was emptied out.
Plop! Plop!
When they came to the end of the tunnel, the two of them kicked up, and soon their heads emerged from the bottom of the water.
The curved end of the tunnel was not wide, and the two of them seemed to have emerged from an ancient well. There was really a different world here.
"Leap up!"
Yang Di spoke excitedly. The wet rock wall was very smooth, but fortunately they were both monks. With one step, they jumped from the water to the entrance of the cave, which was more than three meters high.
After entering the entrance of the cave, Yang Di and Ye Shenyu were surprised to find that the interior of the cave was very large, with enough space for an apartment. There were many stalactites hanging around, dripping with water.
But the two of them were not in a hurry to open their mouths to breathe. As they had guessed before, this natural cave was dark and humid, with almost no oxygen. Instead, it was filled with very thick methane.
Methane is colorless, odorless, and non-toxic, but it cannot be breathed. Therefore, after entering this empty cave in the underground water area, apart from getting rid of being soaked in water, nothing has actually changed. It is still the same cold, wet, and unable to breathe!
What's worse is that after the surprise, Yang Di suddenly felt the urge to curse.
The cave is very large, so there is plenty of space for them to move around, so they don't have to squeeze into a small place.
But this problem also arises. Because the space is too large, it is very difficult to create oxygen. It is estimated that even if Yang Di uses the small infinite thunderbolt hand to release the electric light until he is exhausted, his arm will convulse, and the oxygen produced by electrolysis will not be enough.
This huge cave cannot be filled up.
Moreover, once oxygen is produced, the invisible thick methane around it becomes a time bomb. The slightest spark will turn into a sea of fire.
This really stumped Yang Di.
"It seems we are in trouble." In the darkness, Yang Di lit a bunch of Qi Dao fire between his fingers, illuminating the surrounding area, and shook his head helplessly at Ye Shenyu.
There is no oxygen around now, so even if a fire is forced out, the methane will not explode.