The drones drilled into the ice cave in groups, and even the group of drones on the shaft jumped down, and the scene in front of Ye Han's eyes quickly divided, from a complete Europa to forty-eight small screens.

Each screen is very small, but the image on the screen is very clear, and wherever Ye Han's gaze moves, which screen will automatically zoom in, allowing him to see more clearly.

The screens zoomed in and out one by one, but Ye Han never found what he was looking for, all the screens were straight ice caves without the slightest bend.

He couldn't help but wonder a little that it was his bad luck that all the ice caves were missed; Or is the drone's position too shallow to reach the depth where the aliens are hiding?

Ye Han knew that he was too anxious, but he couldn't control his emotions, he kept telling himself that he must be patient, with a little expectation and a little uneasiness, he silently continued to wait.

Five minutes and fifty-three seconds later, the No. 1 screen froze, and He Lu immediately shouted: "Captain, the No. 1 shaft drone has hit the bottom and lost the signal!" ”

Ye Han had the urge to complain, didn't he just break it? Why are you talking about such literature and art?

His gaze turned to screen one, and the images on the screen immediately switched to slides one by one - the drones were all moving in groups, so there was more than one image sent back.

The first is a straight ice cave, which is supposed to be taken from the bottom of the cave upwards, but you can only see the ice cave, and no matter how you zoom in, you can't see the entrance of the hole.

Ye Han looked at the data in the lower left corner of the screen, and the depth at the time of shooting was 82,641 meters, that is, the vertical depth of the No. 1 shaft was more than 82 kilometers.

The lens of the drone is not a large telescope, and the focal length of the lens is on the wall of the cave, so it is impossible to see things more than eighty kilometers away.

The screen switches to a photo of the cave wall, a very flat arc cylinder.

Switch again, this time to the bottom of the cave.

Ye Han thought that the bottom of the cave was a flat ice surface, but he didn't expect that there was a thick layer of pure white on the picture, which looked very delicate, exactly like the snow in winter.

After a little pondering, he understood that the process of drilling the hole is that the laser melts the ice into water, and the water boils under the irradiation of the laser, and the steam flies all the way up the ice cave until it flies out of the ice cave.

However, the cave is more than 80 kilometers deep, and after the laser ceasefire, there is still a large amount of water vapor in the hole, which gradually condenses in the low temperature of about minus 160 degrees, and then slowly falls to the bottom of the cave, and finally forms an image on the screen.

If it is on the earth, these tiny ice particles are affected by air resistance, and they must be slowly floating upward, and the drone will definitely be able to shoot the scene like falling snow during the fall.

But on Europa, the air is so thin that the drag is almost negligible, and the snow particles and drones are all falling freely in ideal conditions that ignore air resistance, and there is no question of who catches up with whom.

At this time, Ye Han heard He Lu's voice again, and reported that the drones in several other caves had landed, but the result was the same as the shaft, and none of the drones survived.

Ye Han didn't care about the other ice caves, first called up the image of Cave No. 1, the signals sent back by several drones each occupied a screen, and played it at high speed in a fast-forward manner, and the nearly six-minute video was played in only thirty seconds, and the result was that nothing was found, and Cave No. 1 was just a hole.

Pull up the videos of the other ice caves and the results make no difference.

In this way, Ye Han took the trouble to look at them one by one, and every time he told himself that the next hole must be discovered, but until the last hole was finished, there was still nothing abnormal, and all ice caves were just simple ice caves.

Ye Han sighed helplessly, took off his helmet and rubbed the corners of his eyes: "Luo Qi, report to the flagship, our ship has not found anything, and then ask the flagship, if the friendly forces have found it." ”

Luo Qi immediately complied, and soon received a reply: "Boss, the flagship said that nothing was found. ”

Ye Han was taken aback: "Didn't you find it?" Done with all the reports? ”

"More than half of the reports have been reported, and a third have not been reported."

Ye Han had a headache for a while, and suddenly had a bad premonition.

No one knows the odds, but more than two-thirds of the ships didn't find it, and the chances of the remaining one-third getting something are very low.

Only a few minutes later, Luo Qi received a notification from the flagship, as Ye Han expected, more than thirty warships did not find the slightest thing, and more than seven hundred ice caves were all ordinary holes, and the flagship asked the captains of each ship to immediately go to the virtual conference room to gather.

When Ye Han entered the virtual conference room, the person had almost arrived, but a second later, the last captain was in place.

Huo Qiang immediately said: "You all know the situation, right?" There are two purposes for calling you here, firstly, if we didn't find out if we had a problem with the location, or if we were simply unlucky not to meet aliens, secondly, what should we do next, whether to leave the equator, or to rebuild a batch of ice caves, let's start discussing it now, if you have any ideas, just say it. ”

"Let me say it first, it's kind of a brick throw." Zhuang Bo spoke unequivocally, "Could it be that the aliens are not near the equator at all?" ”

"Probably not." Wu Han said, "The aliens of Europa and Europa have landed near the equator, so they can't burrow under the ice and then burrow away, right?" ”

"Is that our bad luck? None of the more than 700 holes are useful, isn't that too bad luck? ”

"Is it not deep enough?" One captain hesitated and said, "Except for the ice cave near the equator, which is relatively vertical, the rest of the inclination angles are not small, the farthest is almost forty-five degrees, the length is almost the same, but the vertical depth difference is a small half!" ”

"yes, what if aliens hide at the bottom of the ice? I have calculated, the average depth of the shaft is 80 kilometers, only about 10 kilometers from the bottom of the ice, the outermost inclined shaft is only 50 kilometers deep, there are still 50 kilometers from the bottom of the ice, there are more than 700 holes, but the depth is enough only the few near the equator, and there are only 50 or 60 when the depth is full, is it strange that you can't find anything? ”

"There is some truth in saying this, but there is no way to stabilize the attitude of the battleship without leaving the synchronous orbit, and the engine is too unstable to make a hole at all!"

"Who's to say otherwise, or else, the battleship will continue to hang on the equator, and the time of the diagonal hole will increase according to the angle, and the farthest will be two hours, or until the water is hit......"

Captains, you and I say a word, and an alternative is gradually taking shape.

Hearing this, Huo Qiang pressed his hand and said: "Very good, the first step is to increase the time, Wu Han, you immediately convey the order, let's discuss the second question, if you still don't find it, what should I do?" ”