Luo Xu was surprised, or rather surprised, that the color of the sky outside was beyond his expectations.

The color of the sky outside is blue.

It may be strange to say this, there is nothing surprising about the blue sky, but the problem is that Luo Xu had already decided that there was a catastrophe outside. What kind of catastrophe will lead to the downfall of America? Within the foreseeable range, in addition to unrestricted nuclear warfare, it is probably a meteorite hitting the earth. But in either case, the blue sky is definitely not something that can be maintained after the above two situations have occurred.

Could it be that I guessed wrong? Or an earthquake, a tsunami?

When Luo Xu was thinking, the gate was fully opened, the lifting platform completely rose and appeared in the world on the ground, and the wide-angle cameras arranged on the predator fuselage and wings showed the vast world on the ground in Luo Xu's eyes for the first time.

"Huh?"

Facts have proved that the blue sky often maintains a certain relationship with the good environment, and the environmental conditions of the world on the ground made Luo Xu stunned, the place where the predator appeared seemed to be located in the open apron of the desolate airstrip for a long time, and next to the runway, it turned out to be a large verdant vast forest, Luo Xu looked at the image transmitted by the camera, as if he felt the breeze blowing.

"This ...... What's going on? ”

There is no trace of disaster in the image, and if there is a disaster, it is because of the departure of human beings, the unmaintained runway is covered with some sand and gravel, and there is even a trace of cracks in the deserted ground.

The high-sensitivity electrochemical sensor specially mounted on the predator starts to work, the air pump automatically extracts the surrounding ambient air, and delivers it to the sensor air chamber at a flow rate of 300ml/min, and then the signal generated by the sensor is amplified and converted to A/D, and the data is processed by the microprocessor, the data results are saved and the information is transmitted to the predator's quantum state generator, and then the data information is transmitted back to the base by the quantum channel.

In such a short distance, the time difference with wireless communication is almost impossible for Luo Xu to notice, and the results are seen quickly, effectively and in a timely manner.

"Nitrogen 77.5%, oxygen 21.5%, argon 0.93%, carbon dioxide 0.02% ......"

"Normal particulate matter, normal sulfur oxides, normal nitrogen oxides......"

"Radiation dose 0.13 μsv/h......"

"The composition of the air is normal, the background radiation is normal, and it doesn't look like a disaster has happened at all."

Stroking his chin and muttering to himself looking at the data on the display, Luo Xu frowned, could it be that he was wrong, and there was no disaster in the outside world? But this doesn't make sense, since there was no disaster, why did the US military abandon such a large and well-established base?

What the hell is going on?

In the picture transmitted by the camera, the outside world seemed quiet and peaceful, but Luo Xu gradually felt a faint uneasiness in his heart for some reason.

"No matter what happens to it, how can Lao Tzu sit here and bear me?"

Just as he was about to order the predator to take off, Luo Xu suddenly thundered in his heart, and a thought actually caused him to chill his whole body, and he was so stiff that he couldn't move. "What happened to this base that caused the U.S. military to abandon it? Don't even dare to come? ”

This terrifying thought made his hands tremble unconsciously, and it took a while to calm down, "How come, I've been here for so many days, and I haven't seen anything happen, don't scare yourself." ”

A calm look quickly regained Luo Xu's expression, "Bob, take off!" ”

The predator slowly drove away from the tarmac, set the bearing, and gradually increased its speed with a bump, Luo Xu couldn't help but pinch a cold sweat for him, after all, there are too many gravels on the runway, and if you are not careful, it may cause the fuselage to turn upside down and crash.

However, apparently he underestimated the strength of the MQ-4, and after gliding for more than 300 meters, he successfully took off at an angle and rushed into the blue sky.

"Good, good!"

He clenched his fists excitedly, as a civilian, it was absolutely unimaginable to be able to see and even make a military plane with his own hands, but today, it was realized in Luo Xu's hands, how could he not be excited.

The MQ-4 Predator has a maximum activity radius of more than 6,500 kilometers, a maximum flight speed of 960 kilometers per hour, a target space time of 48 hours, and a maximum endurance of 160 hours, so Luo Xu is not worried about the distance, which is enough for him to command the Predator to fly to New York on the east coast of the United States, and then fly back to the base.

The harsh sunlight shone on the verdant forests, and as far as the eye could see, the green sea was blowing and dancing in the wind. The photoelectric camera and the reconnaissance camera under the plane started working at the same time, scanning the rivers and mountains 3,000 meters down, hoping to find all traces and clues of human activities. However, to Luo Xu's disappointment, except for the animals in the forest, humans, creatures that leave traces everywhere, seem to have disappeared, not to mention people, there is no artificial facility at all, as if Underground Vault 17 is the only building on this planet.

Luo Xu, who was sitting in the chair, shook his head, reached out and took a sip of coffee, it was too early to draw conclusions, since this is Nevada, let's go to the West Coast of the United States, which is the closest to this place, to see how the big cities are doing.

Receiving Luo Xu's latest order, the predator changed direction, drew a semicircle in the air and flew to the southwest, without satellite navigation, the predator had to turn on the habitual navigation system, and while calibrating by comparing the ground data, the accuracy was not much weaker than GPS, and ran in a straight line to California.

Half an hour later, the predator's small black dot expanded rapidly from the blue sky, piercing through the layers of obstructed air, and finally crossed the border of California, where it could be seen that after passing through the desolate land, California was greeted by a large area of mountain forest. After scanning the terrain with AI on board, it slowly and deliberately controls the speed to climb, always keeping the fuselage and the ground at a certain kilometer altitude, while the reconnaissance equipment is still constantly taking pictures and transmitting real-time information.

This time it didn't take long for the mountains in the distance to have faults, and the plains of human activity gradually appeared in the sky, Luo Xu's spirit was shocked, and he ordered to speed up, and the predator almost immediately increased the output of the engine, so that its speed reached 900 kilometers per hour for the first time, and when it rushed out of the continuous mountains, it quickly reduced its speed and glided towards the scattered town below.

The optical camera under the Predator machine can obtain color images with a resolution of centimeters at an altitude of 4000 meters through self-calibration and self-stabilization combined with wide-angle imaging technology, not to mention that at this time less than 1000 meters in the air, ground activities can be seen clearly by dogs or cats, let alone if it is a human being, but the gray buildings and roads on the ground are almost all blocked by weeds and vines, and there are still traces of human activities.

"How so?"

Finally saw the human buildings other than the base, but this barren and populated situation still made Luo Xu frown, and propped his chin and said, "It seems that no one has lived in it for a long time." ”

The inhabited area on the ground is a small town after all, and the predator flies out of the inhabited area in less than half a minute and continues to fly towards the southwest.

Once the human settlements appeared, it meant that the cities of civilized societies were not far away, and sure enough, the predator's flight path had not left long in the air, and the ground was broken Highway 6 and the high-rise buildings in the distant sky, and that was Bishop.

The closer he got to the city, the more shocking Luo Xu was by the various conditions on the ground, the roads were overgrown with weeds, all kinds of cars were placed on them in strange shapes, rusted and abandoned for I don't know how long, and on the edge of the city, those low buildings were old, covered with vines and unknown plants. The situation on the streets is not much better, with cars crashing into each other as if there were hundreds of major traffic accidents, and some hares, elk, and other animals roam the weed-covered streets just like humans in the past.

Luo Xu looked at the image on the display screen and was speechless for a long time, what kind of disaster did this happen to have such a consequence? Heavy in his heart, he put down his coffee and ordered the predators to continue flying down Highway 395, more than 500 kilometers away is the city of Los Angeles, a world-famous city, where he plans to see how things are.

The Predator cruised at a cruising speed, crossing the narrow plains and heading down the highway towards Los Angeles, and in this case, if it was possible, Luo Xu hoped to find the basis of human activity, then the most likely clue was to go to the big city to check it out.

There are many small cities along the way, but all of them are shrouded in wild grass, and there is no shadow of human activity, and the predators rise to a clear blue sky and gradually increase their speed below the clouds.

It didn't take long for Luo Xu to take a nap, and the predator sent a message back that he had arrived in Los Angeles, the second largest city in the United States and second only to New York. Set against the backdrop of the mighty San Gabriel Hill and bordering the vast San Pedro and Santa Monica Bends, Los Angeles is known for its sunny, dry and rainy weather all year round, and is known for its well-planned city and many attractions. But now, judging from the sights of the predators, it is clear that its beauty is gone, and without human activity and tidying, the city is slowly desolate, the streets are overgrown with plants and trees, and the ponds and weirs are interspersed, and it has become an urban forest for birds and various animals to breed.

The predator shuttles between high-rise buildings, with the assistance of intelligent AI and Bob, it can completely break away from the rigidity of people and be as flexible as a fish among the buildings, taking this opportunity to infrared scanning to identify creatures in the city, hoping to find traces of humans. It's a pity that to the disappointment of the distant Luo Xu, the predator didn't find a human figure after a few circles in the city center, if there was no one here, or the people were hiding in the underground parking lot in the building, then the predator would have no choice.

The Predator still had plenty of fuel, so Luo Xu simply ordered it to fly around Los Angeles to the marginal market town, and then stop along the coastline to reconnoiter after reconnoitring.

;