A small drone dragged a long blue tail arc across the night sky, their structure is very light and convenient, two pairs of balanced short wings are placed on both sides of the body, the tail is a large and a small two micro engines, using solar and fuel hybrid, in an environment like the moon can be said to be extremely fast.

If you record the flight route of each drone, you will find that their trajectory is woven into two rings, inside and outside, and the carefully designed and precise route is like a work of art, perfectly covering every corner of the building's perimeter.

The origin of these drones is very dramatic, the core chip inside them is not a traditional chip, but a semi-biological chip, as early as the end of the twentieth century, human beings have discovered that the brain of isolated animals is also biologically active, can respond to external activities, and then researchers installed sensing electrodes on the brain of mice, connected it to a computer, and constantly simulated the pilot operating the plane, it just kept flying and then crashed, and then continued to start again, endlessly, a year later, This rat became the number one master in the whole game, with a record far exceeding that of any human player, even a professional pilot.

Because this mouse brain has completely regarded itself as an airplane, its vision and perception are completely integrated with the virtual plane, it is in the whole body to complete the flight work, the data in the mouse brain has become the prototype of the first generation of biochips, and now all kinds of drones can be seen everywhere on the moon, with the fifth generation of new biochips, which no longer use the mouse brain, but instead use crows, the world's smartest birds have an innate talent for flying, At the same time, their larger brain capacity allows for more complex work. Of course, these chips will not really be made with the brains of crows, as long as the first crow is transformed as a template by the previous method, the subsequent chips can be manufactured with new 3D printing technology.

There are no crows here, and if a crow were to appear on the lunar planet one day, one might see a crow and a drone staring at each other, unaware that they came from a magical scene of origin.

Nina and Mark are moving towards the edge of the building, they don't have safety ropes on them, if they fall down at this height, even under the low gravity of the moon, they can smash people into meatloaf, the only thing to be thankful for is that there is no strong wind on the moon, and there is no fear of being blown down by a gust of wind when walking in the sky.

"Give me your hand." Nina jumped freely over the building shell like an elegant and agile acrobatic star, while Mark was much more clumsy in comparison, narrowly falling off several times.

"A little further on." Mark grabbed her hand and swung to another landing spot in a thrilling way.

They wore a set of protective suits for sanitation workers, and after escaping from Mark's room, the two of them went to the power dispensing room to steal a lot of tools, and then got this suit, the oxygen cylinder capacity is small, but it can barely allow them to move outdoors for a short time.

If you want to avoid the surveillance of those drones, you can only walk against the wall as much as possible, only this place is their surveillance blind spot, in an assembly room at the corner, Mark saw the door lock, and got a pod car inside, this is a special vehicle specially designed for walking on the exterior wall, unlike ordinary cars, its wheels are on the side of the car, and the wheels are a row of sleek spheres with magnetic force, which can allow it to drive quickly on the surface of the towering building, and after walking a little further, Mark came to the position he planned, Inside this wall is the building's gas transfer valve, which contains not only a very large oxygen pipe, but also a part of the fuel pipeline.

The defense of this place is very tight, it is the key area of drone patrol, and the top of the building is also equipped with an automatic battery to prevent the attack of meteorites, but it is easy to deal with external attacks, and it is much more difficult to prevent internal damage, Mark took out the miniature gas welding in the kit and opened a big circle on the glass case of the building.

"Found their place! Just go! ”

"Location, heading to the edge of the three hundred and twenty-sixth floor."

Mark's actions also set off security alarms in the building, where there are fine electronic alarm lines under every piece of glass, and any breach will trigger the alarm, and Mark knows this, so he must act quickly to get things done before the enemy arrives.

"Nina, how are you doing over there?"

"It's going well, give me two more minutes."

"I know it's crazy...... But that's the only way I can think of it. Mark finished cutting the glass on the outside, and took out a wrench to adjust the threshold of several valves inside, and Nina walked in through the hole he had cut, and connected a small bag to the valve's circuit, which was a simple spark they had just made**, this kind of gadget was very powerful, but the large amount of electric sparks that burst out was enough to ignite some dangerous things, such as combustible gas mixed with oxygen.

"I just took a look, and we're lucky this time, don't worry." Nina said.

"Is it tarot again? My beautiful witch. ”

"No, it's a coc dice, don't worry, that's accurate."

In the distance, several flying cars of the building guards were coming at full speed, and the order from above was whether they were dead or alive, so they set up their guns early in the morning, pointed their guns at the glass gap over there, and opened fire as soon as Mark showed up, and the three flying cars gathered in that direction from several directions, forming an offensive of entrapment, and Mark They had no way to escape.

"Why did they flee to that place...... one of the guards frowned and wondered, this place was the location of the gas valve, it was very dangerous, and there was nothing special, why did they flee this way?

"Who knows, maybe it's in a hurry and there's nowhere to go."

"I think there is still a problem, so it's better for us not to rush closer."

"An order has been issued from above, it can't be delayed, just approach carefully, and you must ensure that the task is completed."

The captain made a gesture to the others, and the other two cars began to approach quickly from both flanks, and the sniper's camera never moved away, all the way to the inside of the breach, just as Mark's body was about to enter their range of vision, suddenly a blue fire burst out from the breach.