The entire underground karst cave began a great inventory, and Yin Dong didn't care about those trivial matters, but explored the cracks in the depths of the underground karst cave. There was a boulder that blocked the entrance to the rift so tightly that it could not be pushed away by the strength of ordinary people. Yin Dong also inadvertently noticed the aura oozing from behind the boulder, and took a look at it, only to find that the boulder was moving.

After removing the boulder, it revealed a dark and unfathomable crack, nearly a hundred meters deep, and before it reached the end, Yin Dong's heartbeat beat inexplicably fast, as if sensing an invisible crisis.

And after going 100 meters deeper, the sense of crisis gradually increased, until the hairs on his body stood on end, and the air around him seemed to be frozen, which made people feel like they were in an ice cave.

Yin Dong moved forward with a sigh of relief, and his steps into the rift were very slow, getting slower and slower with the sense of crisis, lest he make some movement and alarm an unknown existence in the depths of the rift.

He planned to use the underground cave as a temporary base, where most of the fleet would be stationed before leaving Donglai Mountain and returning to the White Mountain base.

If there is a dangerous existence in the depths of the rift, if he can clear it, he must remove it quickly, otherwise, the people in the underground cave must be removed as soon as possible.

The light in the depths of the crack did not become dark in the depths of Yindong at any time, but gradually brightened, as if a torch was burning, the fire swayed, and people swayed on the rock wall. Occasionally, there was a crackling sound.

Looking at the transmitted firelight, Yin Dong did not feel a trace of warmth, but felt a chill in his back, and the pores of his whole body seemed to be seeping cold air into it.

Yin Dong's god tensed, quietly and quickly penetrated into the rift, and with the help of the terrain, although he might hide his figure, he dived into the depths of the rift.

The rock wall of the fissure is not dug and hewn, but a natural opening, the cave wall is not smooth, and there are many pointed stones with interlaced canine teeth and protrusions, so it is not difficult for Yin Dong to hide his body when he moves forward. Moreover, the fissure is inclined downward, and it is relatively easy for him to climb the rock wall and descend.

After sneaking for nearly 10,000 meters, Yin Dong saw a hand-dug vent, which was very secret, blocked by gravel, and it was not big, only the size of a watermelon, and there was a gust of cold wind blowing.

Yin Dong approached the vent and heard a strange sound suddenly coming from inside the cave, like the sharp claws of some fierce beast scratching on a stone.

He cleared the gravel from the vent and dug with his bare hands, widening the vent enough for an adult to get into, when he heard a strange noise inside, and a shadow of the firelight was projected, and as the light of the fire swayed, the shadow was twisting and shaking.

When he arrived here, Yin Dong's heart had always been shrouded in a strong sense of crisis, and for the sake of safety, it was wisest for him to retreat now. But he was a little unwilling, it was difficult to find a place suitable for tens of thousands of people to be stationed, and this underground cave group was very much in line with the current needs.

What's more, under a natural disaster, what is not guaranteed to be dangerous?

In any case, he had to figure out the source of this sense of crisis. After widening the hole, he didn't hesitate to go straight in. As I reached the side of the vent, the sound of the tips of the claws scratching against the stone became clearer, and the shadows that swayed and twisted in the firelight shook even more.

Yin Dong continued to move forward, and at this time it was not in the crack in the ground, but a road paved with blue bricks, and the firelight was emitted from the oil lamps on the walls on both sides of the road, and the lamp oil was extracted from some kind of animal fat, emitting a burnt smell of roasted meat, mixed with the rotten smell that permeated the road.

The further he went, the lower the temperature in the corridor became, and the blood in his whole body seemed to be frozen without using the Dragon Yuan Protective Body.

Yin Dong walked along the corridor for a long time, and he didn't see any people, didn't look at any animals, and didn't hear any other movement in the corridor, but the sense of crisis in his heart was stronger, which made him creepy, and a chill rose along his spine and quickly spread throughout his body.

What does he seem to have overlooked?

This thought flashed through his mind, and before Yin Dong could think about it, suddenly there was a wind in the back of his head, and a sharp burst of air struck with a killing machine from Senhan, making his scalp explode at this moment.

Rumble!

Completely subconsciously, Yin Dong backhanded a blood dragon claw, and in a hurry, he followed in a group of black shadows, and there was a loud bang, and the walls of the corridor were blasted open by the explosion wave, and the gravel was splashed, and many sharp stones flew out, some of them hit Yin Dong's body and were shocked into stone powder, and some shot on the black shadow, making a banging sound.

All of this is complicated, but it all happened in a few breaths, Yin Dong didn't notice where the black shadow was hiding in advance, and even was attacked, and he didn't know what it was.

When Yin Dong struck out, his body flipped over, but he found that the black shadow that attacked him had exploded, mixed with the flying rubble, all of them were gray-black fragments, and he couldn't tell what it was at all.

In the corridor, after the sound of debris falling to the ground, silence returned, and if you didn't look at the rubble on the ground and the damage on the wall, you would feel like you had just hallucinated.

Yin Dong's face changed, the dangerous existence was staring at him, and that guy seemed to be a little elusive, which was unguardable. Even if he wants to retreat now, I'm afraid it will be difficult to retreat with his whole body.

After sweeping his eyes and looking around, Yin Dong did not stay in place and continued to move forward, and now he is still a little unwilling to give up. And the cold wind poured in from somewhere in front of it made it colder and colder in the corridor, and even the green bricks on the paving of the corridor were frozen with a thin layer of ice.

Click......

Suddenly, Yin Dong heard the sound of something breaking thin ice from a crack in the bricks of the corridor, the sound was a little far away, and it sounded a little fluctuating in the cold wind pouring into the corridor, but it made the blood in his whole body begin to boil as if he was being hit by a heavy hammer, and his heart was beating again and again.

Yin Dong was shocked, and he had a strong sense of retreat in his heart, not wanting to go forward to take risks again, but his body seemed to be controlled by a mysterious force, and he kept moving forward.

The thin ice on the green bricks is getting thicker and thicker, the temperature is falling rapidly, the drop is very fast, the cold air forms a mist in the corridor, and Yin Dong feels that his face is about to freeze numb, and the shock suddenly occurs!

There was a bang, and in the section of the road he had just walked, the wall exploded, and a beast claw with scales stretched out, grabbing Yin Dong like lightning.

Yin Dong's reaction was fast, the whole person pounced forward, and then rolled, and saw that the beast claw slammed down, just grazing his left shoulder, and hit the ground, if he was a little slower, he would definitely be hit by the beast claw.