With the experience of the last time, this time, the five mechanical fish were placed directly at the entrance of the hole using cantilevers.

After a little detection below, the mechanical fish found the hole that was shot out by the rail cannon. It was a big hole one meter wide!

It has been 100 minutes since the launch of the space-based rail gun, and the dry ice and methane have begun to condense again. Fortunately, the ice layer (dry ice) condensed at the entrance of this cave is only a few millimeters thick. The power of the mechanical fish is not small, otherwise tens of millions would have been wasted!

As soon as the tail was flicked, the ice cracked, and five mechanical fishes entered one after another.

On the cantilever, the strong lights did not provide enough lighting; I originally wanted to try, but I didn't expect that the lights were also warm, which caused the boiling of methane. It was really clouds and mist, completely blocking the light; I had to give up in the end.

"I hate methane!" Ding Shiyou muttered.

The thickness of the dry ice layer is 100 meters, and the liquid carbon dioxide density is as high as 1.03, which is heavier than water.

"Carbon dioxide is heavier than water, why does it float on the water? Instead of underwater?" Yang Zhencheng was confused. In fact, too many people were confused.

"I think it should be a freezing point problem." Liu Haibo tried to explain, "Although liquid carbon dioxide is indeed heavier than water, don't forget that water will freeze at zero degrees, and at this time the carbon dioxide is already a gas and cannot condense. Therefore, at this time, carbon dioxide is floating on the water surface.

When the temperature above begins to drop, the carbon dioxide begins to condense.”

"Wow, I'm worthy of being the captain, I know that!"

"Get out! Little nail, hurry up and go!"

"My name is Ding Shiyou! Not Xiao Naizi!"

"..." The protest was ignored.

The carbon dioxide layer is really nothing good, but I found that many methane bubbles are constantly floating up, and seeping into the methane above through some tiny pores of the carbon dioxide dry ice layer.

When we reached the bottom layer of liquid carbon dioxide, it was a hole that was only 30 cm in size. It can be seen that the power of the rail cannon has dropped a lot here; but fortunately, it finally penetrated the ice layer, and the ice layer here is already one centimeter thick.

Such thickness cannot stop these mechanical fish, and ice is fragile after all.

The thickness of the ice layer is also more than ten meters.

But when the mechanical fish swam out of the hole, it entered a world that surprised Liu Haibo and others! I felt that everything before was worth it!

The water temperature here is above zero degrees, but, more importantly, this is an endless underground reservoir - at least five mechanical fish detectors cannot detect the edges; and the liquid water here actually breeds life. Compared with Ceres, the warmer, huge, and most complex life here is a tubeworm that is several meters long. This tubeworm is like a jellyfish, very primitive, with only a thin film body, but no brain or nervous system, and the digestive system is extremely simple. Such creatures are more like simple aggregates of microorganisms, and have not had a high degree of cell differentiation.

In addition, this is a cradle of alien life - because there is no sunshine here, many of the lives are covered in white or black colors.

Through the faint light, you can see clearly the images of these close-range lives.

In addition, it is not completely dark, and there are still some luminous creatures. However, there are no plants here. In this underground space, there are only living organisms like corals, between animals and plants. They are more like a collection of fungi, with the ability to synthesize organic matter using thermal energy and minerals. In addition, the water here is filled with a large number of microorganisms.

This shows that the interior of Mars has not completely cooled down. Around 2000, a probe took photos of the sudden flash flood on Mars, although it only disappeared in a flash.

"Search for a sample."

Sampling is not easy. You have to pass through the cantilever, pass the huge straw, grab, etc. through the small hole; although the hole that just frozen has been opened, it is still difficult to control.

First, the iron ball is suspended by fine carbon fiber and lands slowly. Once the position deviates from the hole, the players can only adjust the position by slight swinging the cantilever. Such adjustments will take a few minutes before the changes will be transmitted to the bottom.

It took three hours to just pass the iron ball into the water layer at the bottom. Originally, such a job was a bit difficult even on earth, but now everyone is wearing heavy space suits, so you can imagine the difficulties.

"Release the insulated pipe!"

A roll of hose was put down. Then in the cold environment, it became more fragile than glass. But there was nothing we could do about this. This is the best pipe that the expedition team can take out now.

Following the carbon fiber line, the hose slowly slides into the ice layer and enters the water layer. The water pump starts working, constantly pumping out the groundwater, and along with a large number of tiny lives. The powerful underground pressure is as high as hundreds of earth's atmospheric pressures, which makes the extraction work very smooth; even if you give a little pressure, the water will come to the ground.

"This thing is like an enlarged earthworm!" An unlucky tube worm was pumped up. Of course, there were other lives. They were all placed in a thermal water tank of one meter square. These lives will be tested in space. If they are believed to not cause harm to the earth, they will be brought back to the ground laboratory.

Then, there is a sealed grab, which is very small, only a dozen centimeters, but it is enough to grab certain "plants" and soil at the bottom of this water. In any biosphere, soil is the main source of minerals; analyzing the composition of soil is of great significance; of course, soil often has simple but important lives, and these lives can often provide the basis for real life circles, such as cyanobacteria on the earth.

The entire operation time took more than 20 hours and there was no rest at night. During this period, the mechanical fish also transmitted some specific data under the water back to the ground. Of course, more than 20 hours of detection were enough to exhaust the power, and these mechanical fish also lost the value of recycling.

When the team returned to the base, the detection mission was basically completed. The ice sheets in the North and South Poles used space shuttles to carry instruments for scanning operations, of course, for close-range scanning. This is not difficult for high-tech space shuttles.

"Everything is packed and we're back home!" Liu Haibo disclosed the news that excited everyone in the channel.

"Go home!!!" All 120 people were cheering. The space adventure that was originally planned to be at least three months, and the longest possible one year could actually be reached, but in fact it was only more than two months. This is not because the expedition team did not work hard, but because the environment in space was harsh, beyond everyone's thoughts. Who would have thought that human physiological activities would be severely affected after the orbit of Mars; even now, everyone is still a little palpitations.

Also, long-term weight loss has caused some female employees to face almost the danger of their lives. If they hadn't forced to exercise, they might have lost their osteoporosis and their muscles were atrophy. The most terrifying thing is that the atrophy of the heart, brain, etc. is fatal.
Chapter completed!