Professor Qin has been busy studying double hibernation during this time, and Ye Han and the soldiers have not been idle.

The Thunder Mountain first stopped near Base 1 for a few days, and then received a new order from Beiyue Zhou, which required the Thunder Mountain to immediately rush to a certain area of the asteroid belt to find and destroy all alien vehicles.

The target airspace is about 15 million kilometers away from Base 1, almost one-tenth of an astronomical unit, and Beiyuezhou temporarily calls it No. 4 airspace for convenience.

It's so called because it's the fourth place in the asteroid belt to be infested with aliens!

The astronomical community has another different name for this, and the various letters and numbers are not distinguishable, and the military does not want to use the rules of the astronomical community at all, and directly finds that the various airspace numbers are smoothly, which is simple and convenient.

Speaking of which, I have to mention the Sky Survey Program, which is an early warning plan jointly launched by the two camps, that is, to use space telescopes to observe the entire solar system in sub-divisions, find aliens infested, and immediately focus on observation, if the traces of aliens are found continuously, you can roughly determine that aliens are not accidental.

The No. 4 airspace handed over to the Leishan is such a place, speaking of which, Beiyuezhou found that this place is also related to the Leishan, because this is the final destination of the fat ship!

After the fat ship arrived here, it lost its tracks, and the No. 4 airspace immediately became the key observation area of the North Moon Continent, and then the alien spacecraft was found in the No. 4 airspace for three consecutive days, thus locking this airspace.

Beiyuezhou judged that there should be a secret stronghold of aliens here, judging from the information that has been mastered, the scale of this stronghold is not large, and the time should not be long, in order to cut off the hands of aliens reaching out to the asteroid belt as soon as possible, Beiyuezhou decided to send the Leishan to the fourth airspace to eliminate the aliens here.

After receiving the order, the Leishan immediately set off, and Ye Han immediately began to study the mission information provided by Beiyuezhou.

The information lists in detail the situation in the airspace of No. 4, where there is an asteroid with a diameter of more than 100 kilometers, and the military temporarily gave it the name of No. 4.

In addition to No. 4, there are two larger asteroids here, No. 41 and No. 42, which are more than 20 kilometers in diameter, and No. 42 is only about 10 kilometers in diameter.

The reason why Beiyuezhou is convinced that the aliens are hiding on the fourth is because the fat ship disappeared near the four, and the alien battleship observed later also appeared near the four.

There is another reason, that is, the airspace of No. 4 is too large, it is a large space with a length and width of millions of kilometers, and the distance between No. 41, No. 42 and No. 4 is at least hundreds of thousands of kilometers larger.

However, Ye Han felt that it was necessary to list the four and four two as the goals of this trip, anyway, they were all along the way, and it didn't take much effort to check them...... Ever since Ye Han knew that aliens had entered the asteroid belt, he had always felt that all asteroids had the potential to harbor aliens, especially those that were large enough.

In this way, the Leishan headed for the No. 4 airspace, and on the way to the communication of Beiyuezhou, the battleship had already arrived in the No. 4 airspace when it received the news of the successful experiment.

After reading the communication, Leishan was less than a million kilometers away from the No. 4 asteroid, which is simply close to the astronomical scale, and with the optical equipment that Leishan brings, the whole picture of the No. 4 asteroid can be seen clearly.

But it's strange that no aliens have been found on or near the asteroid.

Looking at the information provided by Beiyuezhou, no aliens have been found in the past few days, and Ye Han can't help but wonder if this place is a temporary foothold for aliens.

Quickly flipped through the previous observation records, the alien spacecraft entered and exited, but in general, it was still more in than out, and the fat ship was not found to leave.

At this time, Ye Han had the bottom in his heart, first took the Leishan to make a small turn, flew to the vicinity of 42 and went around, although he did not find any abnormality, he still left a few small satellites, and then flew to the 4th satellite...... Four-One is in the other direction, not on the route to Star Four.

Because it was about to fly to the target, the Leishan slowed down in advance, and the last distance had to fly for more than 20 hours.

Just when Ye Han was thinking about how to dig out the aliens, He Lu suddenly let out an exclamation: "Captain, there is a situation!" ”

Ye Han stopped thinking and looked up at the home screen.

Asteroid 4 has been shown on the screen, and now there are several very conspicuous bright spots near the asteroid, and they are moving very fast.

"Enlarge the image!" Ye Han commanded.

The image on the screen immediately zoomed in, and it was soon clear what the bright spots looked like, five of the seven bright spots were alien ships, and only two were alien warships.

Only aliens have such a windy ice-white spaceship, and humans would have blackened the battleship a long time ago.

After observing for a while, Ye Han found that the five alien spaceships were actually divided into five directions, one each on the top and bottom, one on the left and one on the left, and one behind them, among which was the round fat ship.

The two alien warships did their duty, and all the ships were fleeing, only they flew towards the Thunder Mountain.

Ye Han looked at the screen and sighed, not to mention that the Leishan had to take a whole day to reach the fourth star, even if there was only one hour left, it was too late to intercept the enemy ship.

Okay, the ducks flew before the battleship arrived, what can I do?

It is true that there are two more enemy ships rushing over, but the enemy ships are also battleships, and the rabbits bite people when they are in a hurry, so it is not so easy to kill these two enemy ships.

The enemy ships that escaped were different, they were all spaceships with no weapons, they were simply stuffed, thin, juicy and delicious, with such a good target, why did they have to gnaw on those two enemy ships?

It's a pity that the aliens didn't give Ye Han a chance to choose at all.

Anyway, there was still a little time, Ye Han racked his brains, but he tried his best to think of ways to avoid the enemy ship, but he had no clue after thinking about it, and finally he could only accept his fate.

It's not a good habit to be picky eaters, so let's kill one.

However, the aliens once again surprised Ye Han's expectations, and the two enemy ships actually turned around and ran away very undisciplined after successfully covering the evacuation of the spacecraft.

Ye Han looked at the ship and sighed, the two sides were separated by hundreds of thousands of kilometers, not to mention that they had to fly for several hours, and when the Leishan arrived at the place, the enemy ship would have already run away.

Helpless, the mission had to continue, Ye Han simply didn't chase it, and the Leishan flew directly to the No. 4 asteroid: "If I can't catch up with your spaceship, I'll blow up your nest!" ”

This is not a casual remark, in order to prevent aliens from occupying Ceres, the Leishan has no less nuclear bombs on board, and the big guy of 1.5 billion tons has brought dozens of them, and it is not a matter of smashing the No. 4 at all.