The stone box is still a stone box, and the stone is still the long stone block that protrudes from a large section, and there is no change in the whole deep cave.

After being stunned for a moment, Hao Yu didn't give up, and used his hand to fiddle with the stone box that was placed on the stone, and changed the direction for it, and the situation was still the same, and later! Hao Yu turned it upside down again, and changed the stone box in several directions, making him a little hairy.

"What the hell? Did I think wrong?...... That's enough, what the hell do you want to do by trapping me in this hell place?"

I don't know what Hao Yu is losing his temper about, he frowned, waved his hand and slapped it on the protruding stone, in anger, he also used internal breath, this unintentional slap made him discover the abnormality.

The palm of his hand slapped on the long stone, feeling the inner breath wrapped in the palm as if it had been sucked away, Hao Yu's heart chuckled, and his brows furrowed: "So that's the case, if you want to open the mechanism, you still need energy, right? Okay! Then I'll give you energy." ”

Hao Yu pressed the palm of his right hand that he had just withdrawn to the long stone again, and crossed a breath against the stone.

As soon as the inner breath approached the stone, there was a devouring force surging, pulling it into the stone, and after Hao Yu's careful induction, the most ferocious place to devour the inner breath energy was the long stone, the stone box, and the large stone embedded in the stone wall, where the three parties touched, as this energy was swallowed up, the long stone took the stone box placed on it, and retreated a little bit into the big stone.

Seeing that it had an effect, Hao Yu suddenly became energetic: "Okay! It works, sure enough, this stone box is the key to open the mechanism." ”

So, Hao Yu began to continuously cross the stone into the inner breath, and with this energy, he stimulated the mechanism in front of him to continue to change. After nearly half an hour of transitional internal breathing, seeing that the long stone block and the stone box were about to shrink into the large stone block embedded in the stone wall, Hao Yu's internal breath was almost exhausted.

His eyes were full of exhaustion, looking at this stone that seemed to be unable to eat enough, Hao Yu had a feeling of crying and laughing: "Could it be that the keys are all in front of me, I ...... But she can't open this mechanism? No, I have to fight, I want to get out quickly, and she doesn't know what is going on?"

Gritting his teeth, Hao Yu took out a special energy crystal from the space ring and held it in the palm of his left hand, he was ready to use his right hand to cross out the internal breath, and at the same time use the energy crystal in the left palm to restore his internal breath, which can be described as a dual-purpose operation, but as soon as this idea was implemented, he encountered difficulties.

When Hao Yu tried to use his heart and soul like this, the internal breath that crossed out of his right palm was broken at once, and the action of swallowing energy crystals in his left palm also failed, and the internal breath in his internal organs was even chaotic at that moment, causing him to almost have internal breath disorder and hurt himself.

Looking at his right palm in disappointment, and then looking at the still shining energy crystals in his left palm, Hao Yu was a little nerve-wracked: "Isn't it really possible to output and replenish internal breath at the same time?"

Thinking of a good solution, Hao Yu had to dispel this idea of single-mindedness, and continued to go to the mechanism on the stone wall, crossing into the inner breath, just when his internal breath was about to be completely exhausted, the long stone, together with the stone box that was put on it, finally completely retreated into the big stone embedded in the stone wall, flush with the big stone, and touched it with his hands, he couldn't feel a trace of unevenness.

"Hmm~ Finally all returned, if I wait a little longer, I'll run out of internal breath. Tired and retracting his outstretched right palm, Hao Yu's face was somewhat joyful, and from his emotion, he could hear some lightness.

His feet swayed, because he had been standing in one place for too long, Hao Yu's feet were numb, he hurriedly leaned against the mountain wall, sat down, and then! A strong sense of exhaustion and emptiness in his internal organs made him care about nothing else, crossed his legs, and closed his eyes and entered pranayama meditation.

And just when he was fully engaged in the exercises, the large stone that Hao Yu had just moved, there was a movement, only a few clicks were heard, and then the long stone blocks and stone boxes embedded in the large stones, they were on this side of the road, almost at the same time, there were faint energy breath fluctuations, and a few breaths, after a click, Hao Yu thought of many ways for a long time, but the stone box that could not be opened, it opened, revealing a gray flutter, no strange color of the sword-shaped stone key inside. The long stone block that originally held the stone box also revealed a rectangular gap, which was vaguely recognizable, and this gap was not much different from the width of the stone key.

Hao Yu, who was immersed in the exercises, did not notice these changes, but as he practiced the exercises for longer and longer, there was a strange energy fluctuation in this small deep hole, which slowly became stronger, and the source of this fluctuation was Hao Yu.

Whew......

I don't know what the reason is, as the breath fluctuation on Hao Yu's body became more and more intense, the big stone that had changed seemed to be moving again, and I saw some strange energy free between heaven and earth, slowly drifting towards the big stone, once it touched it, it was like a water droplet meeting a sponge, and it was sucked in.

Such a magical scene, the movement is getting bigger and bigger, and later, the breath on Hao Yu's body has almost recovered to its full peak, and the speed and scale of the big stone to attract strange energy are also many times larger, every second, there are countless energy beads, sucked into the big stone, as more and more energy is inhaled, the big stone has changed again, and it begins to move slowly outward, as if it is about to bulge out from the stone wall.

呲呲...... Whoop......

Hao Yu's practice is not over, but the big stone stopped moving outward, and no longer sucked in the energy of the outside world, it was as if it had never moved, from a slight depression into the stone wall, completely recovered, not a single bit, if you don't look closely, you can't see even a trace of it. The notch embedded in the large stone, and the open stone box, did not change, and remained embedded in the large stone.

Call~

Exhaled a long breath, Hao Yu finished his exercises, and when he opened his eyes, he saw at first glance that the stone box that had been opened, as well as the stone key in the stone box, and a little bit under the stone box, the sunken gap.

"Great! The box that the Snow Maiden got from the cave was opened, and what was in it was such a stone key? What is the use? What is this hole for?

As soon as he got up and walked quickly to the mountain wall, Hao Yu stretched out his hand and took out the stone key that was the size of his palm from the open stone box, and looked at it, there was nothing surprising, he looked at it again, noticed the small gap in the stone wall, and swept it with his fingers.

I tried it, the stone key and the notch, it's really suitable, just put the sword body part of the key, completely inserted, and then push the stone key hilt part about an inch, this gap seems to be in the end, and Hao Yu also tried to open the lock, want to twist the key, but twist this, can't twist at all, this time! Hao Yu was dumbfounded, thinking that his busy work was going to be in vain.

"Neurotic! A mechanism, do you want to make it so complicated? What a dead man, ancestors! You have too many brains, right?"

Complain a few words, of course Hao Yu can't just give up, he has already done this far, he doesn't believe that he has been doing useless work before.

After trying more than ten times, the stone key inserted into the gap just couldn't be twisted, and he was familiar with it, Hao Yu thought again at this time: "Do you still need energy?"

And so, he pointed the sword-like head of the key, and crossed an inner breath, and instantly!

Seeing this, Hao Yuru won the award, and the inner breath in his hand then crossed into the sword-hil-shaped keyhead, and in the sound of a swish, the stone key inserted into the gap in the stone block, it slowly rotated on its own.

At a certain moment, perhaps the energy needed by the stone key was enough, it flew fast and irregularly, and after turning a few times, it suddenly flew out from the stone wall, as if it had popped out, and was taken by Hao Yu in his hand.

Click, click......

The big stone without the stone key, as if alive, first went to the stone wall, retracted, and then protruded out of the stone wall several inches, and then went back and forth several times, and so on for the last time, when it rushed out of the stone wall nearly two feet, this piece of big stone like a stack of stone doors, after suddenly retracting, retreated to the side of the mountain wall, in this way, the originally empty mountain wall, there is really a square doorway.

"Haha! The secret room, I found the secret room, there must be an exit in it. ”

Looking at the extra hole on the mountain wall, Hao Yu didn't think much about it, so he raised his feet and stepped in, it was dark inside, and he felt that what he stepped on was still the same stone ground as the outside of the cave.

Relying on the infrared night vision function on the combat mecha helmet, Hao Yu was gradually able to see this black rumbling place clearly, but when he saw it clearly for the first time, he screamed in fright and jumped up: "Ah~ this...... How can there be so many bones here? Where the hell have I been?"

After taking a few steps back, Hao Yu was about to exit from the hole he had just entered, but when he retreated to the door, he stopped again: "How can you retreat like this? There may be the only exit here, I ...... Don't want to be stuck in this hole. ”

Holding back the fear in his heart, and even holding the sword in his hand and protecting it in his chest, Hao Yu was bold and walked forward, he tried his best to raise his head and not let himself look at the white bones on the ground, so his steps trembled, and he strode forward.