Meng Chao smelled a smell of dampness and rancidity.

It's like the swamp gas gushing out of a swamp deep in the primeval jungle.

Not only is biogas highly toxic, but it's also very easy –

"Whew!"

Zhou Tianshui was like a balloon that had been poked into a hole, and with the gushing of "biogas", his body instantly shrank by nearly one-third.

In the next second, the "swamp gas" he gushed out exploded violently, and the green flames rose into the air, almost obscuring half of the street.

All the glass windows on both sides of the street were shattered.

Meng Chao was also blown out by the shock wave for more than ten meters.

The retina was exposed to the burning methane, and it was indescribably hot and swollen, and vision blurred again.

After rubbing my eyes for a long time, I found that the deflagrated "biogas" had turned into a dotted ghost fire, and the ghost fire was flying, where was there still the shadow of Zhou Tianshui?

Lu Siya finally caught up.

"Lost?" She asked.

"Lost." Meng Chaodao.

"He's not suspicious, is he?" Lu Siya asked again.

"Believing in my acting skills, he must feel that he escaped by his own ability." Meng Chao smiled slightly.

Lu Siya nodded, took a deep breath, narrowed her eyes and said, "I 'see' his escape route." “

"Fortunately, I have a special tracking potion, which was originally prepared for the super sandworm 'Takano', but I didn't expect it to be used on this kid." Meng Chao was rejoicing.

Just now, he analyzed with Lu Siya that it is impossible for an inner ghost like Zhou Tianshui to be the mastermind behind the mobilization of so many monster troops and the planning of the entire "sound from east to west, precise raid" operation.

Even if you take it on the spot, you may not be able to ask for any key information from his mouth.

Now that Dr. Lu Tianxing's life and death are uncertain, and the "mastermind" of the alien beast has not surfaced, it is better to put a long line to catch a big fish, and deliberately let Zhou Tianshui go to see if he will go to meet with the mastermind of the alien beast.

Therefore, when the arms of the two were staggered, Meng Chao was unaware and applied tracking medicine to Zhou Tianshui's body.

This special tracking potion contains red glow jade and blue primordial mother stone powder, and is mixed with some slime of the "swamp magic lizard".

Since being bombarded by the red glow jade frenzy at the bottom of the Angry Waves Mountain Range, he was lucky enough to hide in the Blue Plains Mother Stone Mine Cave and escaped.

Meng Chao and Lu Siya became particularly sensitive to these two kinds of spars.

In any material, even if there is a little bit of red jade powder in it, they can sense it.

And the "swamp magic lizard" is a very interesting monster.

The strength of the body is not strong, not even a nightmare beast, but it has special skills to confuse and deter enemies.

It secretes dozens of different types of slime and emits the scent of nightmare beasts and even hellbeasts.

By smearing this slime on leaves and shrubs, you can disguise your habitat as a lair of fierce beasts, so that ordinary monsters will not dare to approach.

And its own breath has an indescribable fragrance, which can be smelled by humans even if it is diluted ten thousand times after special training.

Meng Chao is a reaper, Lu Siya is a sensitive one, and he is no stranger to the smell of swamp magic lizards, after receiving intensive training for a period of time in the Alien Beast Investigation Bureau, as long as the spiritual energy is infused on the nasal mucosa, he can have an incomparably developed sense of smell and accurately lock the taste of swamp magic lizards.

Coupled with their induction of the red glow jade vein and the blue primordial mother stone, this kind of Meng Chao personally concocted, only the two of them, plus at most a tracking agent that Qin Hu could perceive, was much more subtle and effective than the ordinary tracking agent produced by the Alien Beast Investigation Bureau.

Originally, Meng Chao's purpose in concocting this tracking potion was to capture super sandworms.

I didn't expect it to be used here by mistake.

Zhou Tianshui thought he had escaped.

As everyone knows, his escape route, in the eyes of Meng Chao and Lu Siya, is like a set of shining road signs.

"Let's go and notify the upper authorities and find more strong people to help." Lu Siya said.

"No, notify the boss, one person is enough, I'll catch up first."

Meng Chao explained, "I didn't have a lot of tracking potions on him just now, in case he escaped underground and the tracking potions were exhausted, then stealing chickens and rice would not be successful."

"And I've sprayed myself with a lot of tracking potion, enough to consume an hour or two.

"Therefore, I have to bite his tail all the way, so that it will be easier for you to catch them all and catch the masterminds behind the scenes!"

Lu Siya originally wanted to stop it, but after thinking about it, she closed her mouth again.

After knowing each other for so long, she knew that Meng Chao was not a person who could be easily stopped.

"Then you be careful, don't die, judging from this posture, the 'mastermind' of the alien beast can't reach the 'doomsday level', and the powerhouses of the Heavenly Realm can't deal with it, and it is definitely not a small peak of the Earth Realm that you can solve."

Lu Siya said, "I'll go to the team leader now and mobilize more masters, including the team leader's elder brother, the god realm powerhouse 'Remnant Sword' Ye Xiaoyue to come to you." “

"Don't worry, I'm not going to die that easily." Meng Chao smiled confidently.

I secretly added in my heart - I will never die until the end is crushed!

He followed the traces left by Zhou Tianshui and quickly chased after him.

Around the corner, the trail turned 90 degrees, appeared on the façade of the building, and then disappeared into a window.

Apparently, Zhou Tianshui climbed the building and jumped into the window.

If you don't track down the potion and chase it straight down the street, you'll probably lose it.

Meng Chao followed Zhou Tianshui's route, walked through the building from the inside, and jumped down from the window on the other side.

Below is the entrance and exit of a subway station.

There's a monster attack tonight.

The city's subways, except for some military lines used for rapid troop mobilization, are all out of service.

This metro station is no exception.

When Meng Chao stepped forward to look, he found that the iron fence pulled down at the entrance and the ground lock had been screwed down.

Someone broke the ground lock, pulled up the iron fence, got in, pulled down the iron fence, and re-disguised it as a closed subway.

"This is it."

Meng Chao didn't hesitate to pull up the iron fence and get in.

He jumped down the stairs in two steps, then over the turnstile, to the platform, and found the traces of the other party, all the way to the depths of the tunnel.

Heightened vigilance and tracking the traces, Meng Chao went deeper into the tunnel more than ten meters along the railroad tracks, and the traces turned into the maintenance passage next to the tunnel.

Meng Chao held his breath and gently pushed open the door of the maintenance channel.

It was dark inside, and he couldn't see his fingers, so Meng Chao simply closed his eyes and scanned them with spiritual energy, outlining a large number of pipes, cables, and repair tools.

In the darkness, the spiritual flames emitted by the red glow jade and blue primordial mother stone powder were like flickering beacons, guiding him in the direction of his progress.

Meng Chao came to the end of the maintenance passage, removed the two toolboxes, and found that a hole had been carved into the wall.

Behind the hole is a ventilation shaft that goes straight down.

The black and dark seem to go straight to the underworld.

Meng Chao glanced back at his back.

I found that I had left traces ten times "brighter" than Zhou Tianshui.

Lu Siya should be able to find this place in time with dozens of God Realm powerhouses, hundreds of Heaven Realm masters, and a million Red Dragon Army, right?

Thinking of this, he turned his heart sideways, drilled into the ventilation shaft, used his hands and feet together, and climbed down.

This ventilation shaft is extremely long and deep, as if there is no end to it.

Judging from the repair of the wall, it does not look like a hole made by sandworms, but a human meticulous construction.

Finally climbed to the bottom of the ventilation shaft and drilled through a horizontal ventilation duct, and there was a collapsed tunnel with twisted rails in the tunnel.

This "tunnel under the tunnel" is darker than the maintenance passage above, as if you are under the sea at a depth of thousands of meters.

Meng Chao used his psionic energy to scan the surrounding situation and found that not far away, under the collapsed rock, there was a broken subway.

I went up to check and found that the subway was half a century ago, the style of the Earth Age.

It seems that this tunnel is a subway line that exists on Earth.

When the dragon city crossed, this tunnel also crossed.

However, because it is on the edge of the traversal range, the space is distorted, the tunnel collapses, and it is abandoned and gradually forgotten.

For snakes, insects, rats and ants who are good at moving underground, this is the best secret passage.

Meng Chao burrowed into the cracks of the collapsed rock and jumped from the front of the car into the abandoned subway.

He walked through the subway car and scanned many skeletons on his seat.

Accidentally, there was a gentle "click" sound under his feet, but he stepped on a few bones.

At the moment of the crossing, the subway line was still operating, and many passengers sat on the subway, and they crossed into the other world in a daze, and before they could react, they encountered an accident of space distortion and tunnel collapse, and died in the depths of the earth.

Crossing is really not a fun thing.

Meng Chao sighed in his heart, becoming more and more careful, bypassing the bones of his compatriots half a century ago.

Suddenly, he stood still in the middle of the penultimate carriage.

Zhou Tianshui's trace disappeared.

From the front of the car to here, there have been faint traces on the ground.

Although the breath is getting thinner and thinner, it will not dissipate in an instant.

Meng Chao narrowed his eyes and scanned his surroundings vigilantly.

Suddenly there was a soft sound of bones shattering behind him, "click".

He didn't hesitate, and with a "scorpion tail swing", he hit something like leather.

The thing fell out, but without even snorting, it rushed back with ten times more ferocity.

Be...... Zhou Tianshui?

In the narrow subway car, long guns and short cannons cannot be used, and as soon as the two sides fight, it is a hand-to-hand battle.

Meng Chao fell over the shoulder and slammed the other party to the ground.

Obviously he had already controlled his hands and legs, but there was still a strong wind behind him.

With a "snap", Meng Chao's spine was hit hard and he staggered forward and flew out.

When he looked back, he saw a humanoid monster.

The monster's face is still Zhou Tianshui's appearance.

The cheeks, chin, limbs and torso are covered with a layer of bronzed scales.

On the sides of both arms, sharp bone spurs protruded.

Both hands turned into sharp claws.

There was also a scaly, meteor-like tail trailing behind it.