Xia Ruofei, who had already retreated in his heart, suddenly perked up.

Induction Yuye also reacted, which meant that he was not far from the boundary stone, and he adjusted his internal breathing according to the exercises of "Great Dao Decision", and continued to dive down with his legs.

Although the area irradiated by the strong flashlight is still full of pool water, and it is impossible to see the bottom at all, Xia Ruofei is very motivated.

The pool water was getting colder and colder, and Xia Ruofei's teeth began to collide together involuntarily, making a gurgling sound.

Can make a cultivator cold like this, the temperature of this pool of water can be imagined.

In such a situation, the consumption of true qi is also amazing, Rao is Xia Ruofei's cultivation of the "Great Dao Decision" belongs to the top exercises, and the true qi is much stronger than that of cultivators with the same cultivation, but he can't withstand such consumption, and gradually he also feels that he has a trace of strength.

Of course, it has reached this point, and it is absolutely impossible for him to give up easily.

Xia Ruofei has already made up his mind, if he really can't support it, then enter the Lingtu space, so that he can not only breathe, but also use the difference in time flow speed to meditate and restore his true qi in the Yuan Chu Realm, I believe that in a short period of time, the Lingtu Picture Scroll will not be damaged in such an extremely cold environment, and it will not deviate too much from its original position.

However, Xia Ruofei didn't take out the spirit map scroll immediately, he still wanted to challenge his limits.

After diving about 50 meters or so, the surrounding water pressure is already very amazing, if it is an ordinary person without professional training, I am afraid that the lungs will be seriously injured.

Just as Xia Ruofei gritted his teeth and was about to continue diving, the white beaver in the space squeaked and gestured to Xia Ruofei.

Xia Ruofei had always maintained a mental connection with the Lingtu Space, and naturally sensed the signal sent to him by the White Realm Beaver for the first time.

"Swim to the left?" Xia Ruofei said secretly in his heart.

The white beaver motioned for him not to continue diving, but to swim to the left side of his body. Xia Ruofei was slightly happy in his heart, does this mean that he is already close to the boundary stone?

In any case, it is at least better to swim sideways than to continue diving, Xia Ruofei judged that if he continued to dive further, at most fifty meters, whether it was water pressure or the low temperature environment underwater, it should reach the limit that his body could bear, and even if he hid in the space to recover his true qi, it would be difficult to dive deeper.

And if he swims horizontally, he can still hold on to his inner breath for a long time, and even if he can't hold on, as long as he changes his breath in the space, he can continue to hold on underwater.

originally thought that the boundary stone needed to dive to the bottom of the pool to find it, but for this amazing depth of the pool, Xia Ruofei also beat a drum in his heart, and he didn't know when he would see the bottom, and now he was secretly relieved.

Xia Ruofei immediately turned his body and swam to the left, and at the same time, the strong flashlight in his hand also shone forward, trying to see the situation in front as clearly as possible.

The bottom of this pool was much bigger than Xia Ruofei imagined, and he swam at least twenty or thirty meters to the left, but he still didn't see the wall of the pool.

Apparently this is in the shape of an inverted funnel, because from the shore, the extent of the waterhole is not so large at all, but it grows larger and larger as it goes down.

Xia Ruofei could feel that the induction jade leaf on his chest was getting hotter and hotter, which made him feel a lot more relieved, because it showed that he was getting closer and closer to the boundary stone.

The white beaver in the space also became more and more excited.

Xia Ruofei continued to swim forward for more than 20 meters, and finally saw the strange rocky pool wall under the illumination of the strong flashlight, and about two meters in front of him, there was a black hole.

"Squeak, squeak, squeak!" the white raccoon cries as he jumps, gesturing with his forelimbs.

"Let me go into that stone cave?" Xia Ruofei asked with a heart.

The white beaver immediately nodded again and again like a chicken pecking rice, so if the little girl saw it, she would definitely be cute.

Xia Ruofei didn't hesitate, his legs hit the water quickly, his body dived a little, and swam towards the hole.

Under the illumination of the strong flashlight, Xia Ruofei gradually saw the appearance of the hole clearly.

It is about a meter in diameter, and it looks like a very regular circle, and the edges are very smooth, which is completely different from the pool wall just seen.

There is no doubt that the hole was dug by hand.

Who could have carved such a regular stone cave under the water nearly 200 meters deep? Xia Ruofei couldn't help but be secretly surprised in his heart.

He didn't dare to slack off at all, his spiritual power radiated out early, and the little true qi left was also puffed up, ready to deal with unknown dangers at any time.

The inside of the cave was so dark that he couldn't see the situation inside clearly, and it was difficult for his spiritual power to extend into it, which was very similar to the situation he encountered in the strange white mist before he fell to this small island.

Xia Ruofei instead put the strong flashlight in his mouth, held the military dagger tightly with his right hand, and paddled back hard with both hands, while his legs also swung together, and his body swept lightly through the water, directly into the narrow stone cave.

He felt as if he had passed through an invisible membrane wall, and the inside of the cave was actually dry, and there was not even a drop of water.

Xia Ruofei still maintained the posture of diving, and without any preparation for a while, he fell directly to the ground of the stone cave.

Xia Ruofei opened his mouth wide in surprise, the strong flashlight fell to the ground, and the beam of light danced wildly in the stone cave, he woke up in shock, and quickly reached out and grabbed the flashlight.

The diameter of the cave is just over one meter, and it is difficult to turn around in it.

Xia Ruofei grabbed the flashlight and shone it behind him, and at the same time turned his head as hard as he could.

I saw that there was still a slightly swaying pool of water at the entrance of the cave, but the pool water seemed to be blocked by a transparent cover, and it did not flow into the cave at all.

Xia Ruofei guessed that this should be the effect of the formation, but he was still very amazed.

You must know that this is nearly 200 meters deep, and the water pressure is amazing, which can block the pool water from the outside, but people can easily penetrate it, and this formation is not simple.

Xia Ruofei had been holding his breath since he entered the water, and after entering the stone cave, he tried to exhale the turbidity, and then took a gentle breath.

He immediately found that the air in this stone cave was quite fresh, and it seemed that the concentration of spiritual energy was quite high, although it could not be compared with the environment of the spiritual map space, but compared with the ordinary places in the outside world, this place could be regarded as a treasure land with rich spiritual energy.

Xia Ruofei also took a few breaths with confidence, feeling much happier all over his body.

Although he can maintain the state of internal breathing underwater with the exercises of "Great Dao Decision", breathing is a human instinct, and he still feels very depressed in his subconscious when he has not breathed for so long.

Now the feeling of suffocation is finally gone.

Xia Ruofei didn't stay at the entrance of the cave too much, and after a short rest, he began to move forward.

The diameter of this cave is only a little over a meter, and an adult can only barely pass through it, and it must crawl forward.

If you are a person with claustrophobia, you will probably go crazy after a long time in such an environment.

Xia Ruofei's psychological quality is very strong, and he still crawls forward very calmly.

This stone cave also has a downward slope, and the temperature in the cave is also very low, Xia Ruofei even feels a little colder than in the pool.

He held the dagger tightly in one hand, and his spiritual power did not dare to take it back for a moment, and in this stone cave, his spiritual power was also greatly suppressed, and he could only detect the appearance of three or four meters in front of him.

As he continued to crawl forward, Xia Ruofei felt that the stone cave began to gradually become spacious, and the feeling of crampedness became lower and lower.

Of course, the temperature inside the cave is still extremely low, and even the deeper you go, the lower the temperature becomes.

After more than a hundred meters, the width of the cave was large enough for an adult to bend over and walk.

Xia Ruofei also sat up from the ground and rested against the cave wall for a while.

After all, he had been crawling in that narrow corridor just now, and he needed to constantly use his true qi to fight the cold, so he was tired enough along the way.

Xia Ruofei took out a bottle of Lingtan water that was mixed with Lingxin Flower petals from the space, and drank it with a bang, which immediately accelerated the recovery speed of spiritual power and true qi.

He sat for more than three minutes, then got up and bent on his back.

The stone cave continued to widen, and it was only less than fifty meters to advance, Xia Ruofei found that the diameter of the stone cave had become at least two or three meters, which was not only much more spacious, but also high enough for him to straighten up and walk normally.

It's a lot easier.

Xia Ruofei moved forward cautiously with a dagger in his hand, and his spiritual power was always probing his surroundings, always maintaining a high degree of vigilance.

The stone cave was very quiet, and Xia Ruofei could clearly hear his footsteps and the sound of his heartbeat.

The induction jade leaf on his chest was a little hot, indicating that the boundary stone was nearby.

The passage of the stone cave was slightly inclined downward, and Xia Ruofei judged that by now, this position had already exceeded two hundred meters from the ground.

Finally, after advancing another sixty or seventy meters, Xia Ruofei saw a stone door.

This cyan stone door is supposed to be made of a huge piece of bluestone, with an ancient atmosphere, and is tightly connected to the entire passage, and there are no switches or handles or anything like that.

Xia Ruofei walked closer, and soon found that the stone door was engraved with mysterious formation patterns, constituting a complete formation diagram.

After a little analysis, his heart has settled down a lot - this formation is in the same vein as the enchantment formation by the waterhole, although the two formations are completely different, but the idea of arranging the formation is the same way.

Xia Ruofei had studied the enchantment formation by the waterhole for a whole day and night, and he had already thoroughly understood the principle of that formation, and now it was relatively easier to analyze this formation.

He vaguely knew in his heart that this formation was the key to opening the stone gate.

Of course, it also takes a lot of time to analyze this formation.

Although it has been almost half an hour since entering the waterhole, it is very likely that the giant python has returned to the waterhole, and even if it can't enter the formation, it is very likely that it will stay outside the formation. But now that it has come to this point, Xia Ruofei can't care about the giant python, and will open the stone door with all his might.

Anyway, even if you go back the way you came now, the giant python is very likely to have returned, and maybe it will be caught.

The induction jade leaf was already hot, and the boundary stone was close at hand, Xia Ruofei naturally knew how to choose.

Now is not the time to think about the giant python at all, only by calming down and analyzing this formation on the stone gate can it be possible to open it as soon as possible, the more anxious you are, the more it will backfire.

Xia Ruofei quickly memorized the entire formation diagram in his mind under the strong flashlight, and then he sat down cross-legged in front of the stone gate, put the flashlight aside, and analyzed and practiced this formation in his mind with his eyes slightly closed.

Time passed minute by minute, and the principle of this formation became clearer and clearer in Xia Ruofei's mind.

The formation is also divided into genres.

Obviously, Xia Ruofei's previous analysis and cracking of the enchantment formation by the waterhole played a great role in helping him analyze the formation in front of him.

The patterns form the basic formation, and the basic formations are combined into a formation.

Xia Ruofei still starts from the analysis of each basic formation diagram, and then reverses it through the connection between them.

Although they are doing the same work, the efficiency this time is much higher than the last time they analyzed the enchantment formation.

He sat for about an hour before he suddenly opened his eyes with a relaxed smile on his face.

"It should be like this!" Xia Ruofei muttered to himself.

He had deduced it in his mind several times just now, and he had basically determined the results of his analysis.

Xia Ruofei stood up with confidence and returned to the stone gate.

With a confident smile on his face, he reached out and pressed it at a certain node in the formation diagram, and at the same time exhaled his true qi slightly.

Immediately after, Xia Ruofei's fingers quickly clicked on the formation diagram continuously, and each time he poured a wisp of true qi.

The whole process takes about 10 seconds.

When Xia Ruofei clicked the last finger, the entire array seemed to be lit up all at once, and a dazzling light appeared on each array, and this brilliant light was circulating rapidly on the array.

At the same time, there was a clicking sound, and the cyan stone door began to rise slowly.

The stone gate seemed to be very heavy, and the rate of ascent was quite slow.

Xia Ruofei could see through the gap exposed under the stone door and see the pale cyan glimmer inside.

It took more than two minutes for the stone door to rise to the top, and with a click, the stone door seemed to be locked, hanging steadily above, revealing a two-meter-wide and three-meter-high doorway.

Xia Ruofei walked in with full expectations.

When he passed through the doorway, he looked up and found that this stone door was more than a meter thick, and he couldn't help but take a slight breath - this is simply the legendary Broken Dragon Stone! It is almost impossible to open this door by brute force alone.

Passing through the doorway more than one meter deep, Xia Ruofei's eyes widened all of a sudden, revealing a look of great amazement......