It looked unremarkable, but after a few fiddling around with the wall, a dark grid popped up, and she pulled out a few more things and put them on.

Thundered!

A small hole appeared behind the dark grid, dark and bottomless, and there was a faint sound of water.

Without saying a word, Yu'er got into the hole, fell down with a bang, and didn't hear the sound of falling water for a long time.

Chen Mu waited for a few seconds, and then followed in, which was a very steep almost vertical slope, and the four walls were very smooth, a bit like a slide in a water park.

Whew!

He slipped dizzily, and it felt like he had been washed into a spiraling sewer and slipped for half a day before entering the water.

Crash!

The impact force of entering the water was a bit large, but fortunately, there was a spiral curve buffer along the way, and Chen Mu's protective Ou Qi could barely bear it.

"Hey, this water is weird, otherwise the impact of a slide alone would not be able to shake my protective European qi. ”

Chen Mu surfaced and looked around, this is an underground dark river, surrounded by green, there is no bright light source, only relying on the radiation moss on the rock wall to illuminate.

This river water is a little strange, the radiation is very strong, it seems to have exceeded the limit of the Little Black Tide area, Rao is Chen Mu, a five-star level martial artist, is also a little unbearable.

On the contrary, Yu'er, a little girl who looked weak, had already climbed onto the shore at this time, as if she had not been affected by the strong radiation, and her expression was calm.

"Come up first, and wait until I get rid of the secret passage before leaving. ”

Yu'er asked Chen Mu to go ashore, and then took out a few things from the small baggage, like some kind of mechanical parts, which were combined to be a bit of a remote control.

After assembling it, she pressed it a few more times, and then turned around sharply and ran towards the upper reaches of the dark river, Chen Mu hurriedly followed, feeling that something bad was about to happen.

Boom Boom Boom ......

Sure enough, a continuous explosion sounded from the rock wall above, and then the entire underground space collapsed.

Thinking of the location of the secret passage and the geographical structure around it, I am afraid that this will blow up half of Blue Maple City.

But in this way, this secret passage is also completely reimbursed, and no matter how bad the enemy is, it is impossible to track it down.

Underground rivers lead in all directions, God knows where the fugitives will go, and without the secret passages, there is no way to trace them down and find the first-hand traces, and it is almost impossible to find the whereabouts of the fugitives.

"Well, it's really safer this way, but ......" Chen Mu hesitated for a moment, but still asked: "But after completely blowing up the secret passage, how did the fourth master escape from Blue Maple City?"

He also followed the title of "Fourth Master" to call the old man in Nagoya, if he guessed correctly, the identity of the old man and the little girl is simply fake.

These two people should not have anything to do with the original owner of Nagoya, but they are only lurking in Blue Maple City for ulterior purposes.

At the same time as destroying the secret passage, Yu'er made a strange mount from a dark compartment near the river.

This thing seems to be a zombie mutant beast, not very large, only the size of two Harley-Davidson motorcycles, and the appearance is a lizard species, with iron-green skin, a bare head, and no glasses.

There is no breath of living creatures, Chen Mu keenly feels that this thing seems to be a bit similar to those crow ghosts, and it also has an indescribable aura of steel, but the appearance is similar to a zombie beast.

"What are you doing in a daze, hurry up, do you want to stay here and be buried alive?"

Yu'er jumped on the car and beckoned Chen Mu to come over, this thing is divided into two parts, left and right, and it seems to be a monster riding in pairs.

Chen Mu jumped on the empty seat on the right, and Yu'er tapped rhythmically on the monster's smooth head a few times, and the thing flew out with a swish.

It's really flying, and two orange-red flames erupt from behind the butt of this thing, like a jet fighter, extremely fast, and it will automatically avoid obstacles in front of it, which is simply not good.

Whew!

It flew all the way up the dark river, and soon joined the intersection of a network of rivers.

This place is densely packed with whirlpools where rivers meet, like a beehive, Chen Mu glanced at it, there are at least twenty or thirty tributaries converging here.

But the area here is not very large, and it feels a little weird, but if there is a problem, he can't say anything at all.

"Sit tight, it's time to start diving. ”

Yu'er said hello and pulled out a fully enclosed helmet herself, which seemed to be used to assist underwater breathing.

Chen Mu was a little confused, it stands to reason that if it is a true innate martial artist, it can be circulated in the body in a short period of time, and diving or something is not a problem at all.

Could it be that this Yu'er is really not a hidden master? He secretly wondered, but he did not act rashly.

Since the other party dares to take him so confidently and boldly, he naturally has hole cards, otherwise the fourth master will not use any means at all, at least he has to learn what poison to pour into it, and then use the antidote to coerce himself into submission, right?

Thinking about it, the lizardbuise had plunged headlong into the water, located at the confluence of three rivers.

There are many such intersections here, and the one chosen by Yu'er is also mediocre, and I can't see anything special.

Boom!

The fire behind the lizardmonster's butt went out, and in turn it kept sucking in the river water, and then squirting out from the sides of its body, apparently turning on the underwater movement mode.

The speed is much slower than before, and the water is pitch black, and the vision is greatly affected, Rao is Chen Mu has night vision, and it is also a little difficult in this environment.

Swish!

The lizardmonster's bald head suddenly lit up, and two bright pillars of light shot out, like searchlights, illuminating the front brightly.

Immediately afterwards, under the pillar of light, a dark blue transparent light net was projected, just like an underwater radar scanning device in a science fiction movie, so cool that you don't want to.

Chen Mu was also stunned, and became more and more sure that this lizard monster was not a simple zombie mutant beast, it should be similar to the crow ghost, and a lot of mechanical devices were implanted and transformed, which belonged to semi-mechanical biochemical weapons.

Thinking of the "ghost clan" mentioned by Yu'er before, Chen Mu was even more puzzled, could it be that this ghost clan still has a lot of mechanical knowledge?

Thinking of the ark he encountered at the beginning, Chen Mu understood a little, since he was able to encounter the ark, it was not completely impossible for other people or forces to get some technology left over from the old era.

Just thinking about it, the lizard monster had already dived very deep, and along the way, under the search of the blue light network, it turned around, and finally entered a narrow hole with the help of an undercurrent.

The further inside, the narrower it became, and finally the lizard monster couldn't move forward, so Yu'er jumped down and walked forward: "Follow closely, this is an ancient ruin, if you don't pay attention, you will die, you follow me, don't touch anything." ”