To his surprise, it was really not his delusion.

As a black shadow gradually approached, Chen Shi could see clearly, two dragonfly-sized drones flew slowly, gradually lowering to a height of ten meters, hovering around where he disappeared just now.

"Drones? Where did the drones come from? ”

The whole city is already empty, how can there be drones flying? This shattered the previous speculation, could it be that there are actually survivors in this city?

It's not impossible.

The city was huge, and the area he had traveled to before was very small, and it was not representative of the entire city, not to mention that if there were survivors hiding inside the building, he might not find out.

So who exactly is operating the drone behind it?

Chen Shi thought about it for a while, and did not go out directly to expose his figure, but still hid here, and only walked out when the two dragonfly-sized drones could not avoid Chen Shi's traces and flew away.

Optical invisibility is not omnipotent, for example, visible light is indeed partially distorted, but infrared and other frequencies of light cannot be completely distorted, and a certain amount of light must be kept in other parts, otherwise Chen Shi will also become blind while being optically invisible.

He also has to be careful, especially no more than ordinary humans, the other party is a drone, and he doesn't know if he will detect his whereabouts, and there is nothing wrong with being more cautious.

Quietly following the two drones, Chen Shi has the assistance of the gamma suit, otherwise he can't catch up with the speed of the two drones, his eyes track the drone, his feet run quickly, and every step he takes, the sound is absorbed by the special material of the gamma suit, resulting in almost no attention-grabbing level of movement.

At the same time as the two drones fly, they will stay and hover for a while from time to time, as if they are still looking for traces of Chen Shi, and every time at this time, he will find a nearby place to hide, and he will not dare to move, for fear that the flaws in moving will attract the attention of the drone.

Several times in a row, as if confirming that Chen Shi could not be found by relying on this method, the two drones gave up the reconnaissance mission, accelerated their flight speed, and flew towards the deserted streets between the buildings on both sides.

“…… Whew......"

After taking a few deep breaths, Chen Shi also accelerated his action as usual, under such an accelerated speed, it inevitably caused a certain sound, fortunately, the two drones in front of him were very fast, and it was impossible to detect the sound of a hundred meters behind under high-speed movement.

However, the complex terrain of the city still hindered Chen Shi's movements, and after ten minutes, a collapsed high-rise building blocked the way forward, but the drone did not slow down, but instead got into the gap of the collapse of the high-rise building, and flew into it in an instant.

And Chen Shi couldn't do this, those gaps were extremely small, and some could indeed accommodate people to go in, but he didn't know if he could get out smoothly after entering, so naturally it was impossible for him to get into it without thinking.

"Bang."

After a slight crisp sound, Chen Shi's body flew up more than ten meters in the air, "snapped" to smash a reinforced concrete block, fell to the side of the collapsed high-rise building, and then stepped on the side of the high-rise building at a very fast speed, and after a few breathing processes, the person crossed the entire collapsed high-rise building and came to the opposite side of the street.

As soon as he came to the opposite side of the street, he happened to see the two drones burrow into the ground entrance of the subway.

"Underground?"

Chen Shi didn't slow down, but still chased after him as usual.

The entrance to the subway here is still intact and not blocked, which shows that the underground drainage project here has not yet entered a state of paralysis, unlike the neighborhoods he encountered before, the streets are full of stagnant water.

However, at the moment when he was really about to enter the subway, Chen Shi slowed down his movements and walked in with a cautious attitude.

The speed at which he just caught up was already a big step slower, and if he accelerated it now, he might not be able to catch up with the two drones that entered the subway, so it was better to be cautious.

After all, he has a lot of room to move on the ground, and when he goes underground, there is not much room for maneuvering.

A little different from the subway where the earth is located, Chen Shi, who stepped down, first saw an escalator with a very deep depth, let alone 100 meters, after stepping on the escalator that stopped running, he directly saw a platform, and a track that was enclosed in transparent glass.

"Hey, the subway runs in a glass tube?"

Chen Shi was stunned for a moment, and quickly put aside this idea again, and shifted the target to find the two drones.

Didn't find it.

In the dark underground platform, under Chen Shi's night vision, he found that the originally closed glass tube, and several places on the left side had been broken.

It's enough for people to bend down and get in, let alone two dragonfly-sized drones, so it's certainly a breeze to get in.

Chen Shi didn't hesitate much, walked over, listened quietly for a while, and his ear power would also increase, and sure enough, he heard some movement faintly in the pipe.

It's the sound of those two drones!

The sound processing of the two drones flying was extremely powerful, and there was almost no noise, but within this glass pipe, the sound would expand a lot, and Chen Shi still tracked the traces.

After confirming the traces of the two drones, it was true that after entering from here, Chen Shi immediately got into it and followed the direction where the sound came from.

This glass pipe is actually quite large, and if it is a real subway train in it, I am afraid it can also be accommodated.

As he carefully tracked the two drones, he pondered, and suddenly it occurred to him, this can't be a vacuum pipe, right?

Well, with the technological prowess of this era, it is really possible to invent a vacuum subway train with a speed of more than 1,000 kilometers per hour.

It's a pity that such a powerful civilization hasn't seen a single other human being.

Those two drones are the only clues, and I just hope to find other humans on this...... And if you can find other humans, using the technology of this era, you may be able to find the lost cube quickly.

In a flash of thought, a light suddenly lit up in front of him, and after his heart moved, and after walking for a thousand kilometers, he saw the source of the light before the intensity of the light increased in front of him.

It turned out that the vacuum pipe was damaged again, and where he arrived, the pipe on the right hand side had a big hole, but in fact, it was not only that, outside the sealed pipe was the tunnel, and the tunnel also collapsed in this section.

The light source came from the place where it collapsed.