Moreover, this is only a walk in one direction of the open lava tunnel, and this lava tunnel, after being opened, has two directions, left and right. Yun Lei and his entourage left a few people at the intersection of the artificial tunnel and the volcanic lava tunnel to install various equipment and instruments to prevent changes.

The group that went deep into the lava tunnel chose a direction, leaving large and small LED lights as a mark on their tracks. Just as a hunter in the deep mountains will leave a mark on the trunk of a tree.

But in the past billions of years, no living creature has ever existed, and under the Martian Olympus, in the dark and deep lava tunnel, there are also faint lights.

After walking slowly for several hours, the robot in front of me suddenly sent back some special signals and images!

In front of this volcanic lava tunnel, a huge fork appeared.

This fork seems to be a tree descending from the trunk to its roots. It seems that from the root vein part upward, the branch was found, and anyway, seven or eight volcanic tunnels of different thicknesses and sizes were branched out. No one knows which branch is the main trunk of the lava tunnel and which way they should go next.

What about the other lava tunnels? Mars is much larger than the Moon, and the geological conditions are naturally much more complex. Moreover, the volcano of Mars is much more complex than the volcanic lava tunnel on Earth than the volcanic lava tunnel on Earth, after all, Mount Olympus is the largest volcano in the solar system.

Yun Lei and his entourage, you look at me, I look at you, looking at each other. None of them had ever been in this situation, and they didn't know what to do.

If the division of troops is advanced, then it will not be possible to ensure the concentration of forces and the safety of the whole team. Whatever danger you encounter, it's hard to guarantee that you're foolproof.

And those intelligent robots that are pioneers, can adapt to various terrains, and are equipped with various exploration instruments such as lighting equipment and cameras, after entering these lava tunnels separately, even walked several kilometers and were about to go outside the remote sensing range, they did not get any effective information, the length and spatial volume of these seven or eight lava tunnels are unexpectedly large.

At this time, Xiao Yu'er suddenly pointed to a volcanic lava tunnel and said to Yun Lei: "I think we can walk this volcanic lava tunnel!"

Yun Lei's heart moved, and he asked Xiao Yu'er: "Why did you choose this path, what kind of feeling do you have?"

Xiao Yu'er said: "It just feels a little different. Especially when urging Dinghai Shenzhu to calm his mind. It seems to feel a little trace of water aura fluctuations. ”

A female scientist in China is playing with Xiaoyuer all day long on the Thunder, these girls are more familiar. Know the unique abilities of the little fish. Listen to Xiao Yu'er say: "It's better to send an intelligent robot to go farther and test the water vapor content in the air in this volcanic lava tunnel." When Xiao Yu'er says this, maybe there will be a special surprise. ”

"Even if you go out of the remote control range, you don't lose too much of an intelligent robot. ”

While speaking, the Chinese scientists chose an intelligent robot with the longest remote control distance and carried an instrument that could be used to detect the water vapor content in the air, and walked into the volcanic lava tunnel that Xiao Yu'er pointed to.

The little fish also sat on the ground and began to settle down, sensing the fluctuations of the water aura between heaven and earth.

The performance of the intelligent robot is good, but it walked out of more than one kilometer in a moment, and after walking for a while, after walking three kilometers, it approached the limit distance of remote control.

Remote-controlled intelligent robots are not the same as remote-controlled unmanned aircraft, and some civilian remote-controlled unmanned aircraft have a farthest remote-controlled distance of nearly ten kilometers. And military remote-controlled unmanned aircraft can even reach tens of kilometers, or even hundreds of kilometers. The existence of these levels of secrecy will be even farther away from their remote control. At the height of the Mayflower Federation, the satellites used to explore Mars were remotely controlled.

However, in this underground, volcanic lava tunnel, due to the obstruction of the rock mass, the remote control signal is weakened layer by layer after a large amount of reflection and absorption. Although these underground robots are designed to have a remote control distance of up to 10 kilometers, in the actual use of the detection process, 3 kilometers is basically the limit. Beyond this distance, there will be a situation where the signal is out of control and the signal is not working.

Before the signal failed, a device carrying a device that could detect the amount of water vapor in the air finally returned a fluctuating signal on the display. The moisture content in the air has increased slightly. In other words, the air in this lava tunnel has finally become humid!

These slight changes seem to be subtle, and this discovery seems to be nothing too special, but it makes all the scientists present marvel and cheer, and unanimously choose to take the volcanic lava tunnel chosen by Xiaoyuer!

In fact, before the Thunder landed on Mars, human beings were relatively sure that there was water on Mars. The Mars rover of the Mayflower Federation. High-resolution photographs taken by the Mars Global Surveyor show the history of liquid water.

These photos show a huge crater on Mars, which was once a volcanic lake. Although this crater, which is more than 60 kilometers wide, has long since dried up completely, the remains left behind show that there was once an abundant source of water on ancient Mars.

The photos taken by the Mars Global Surveyor also show that there is a huge alluvial delta on Mars, and the rivers that form this huge alluvial delta eventually fill a giant ocean covering almost one-third of the surface of Mars!

And that ancient Martian ocean is now the vast lowland plain of the northern hemisphere of Mars!

At the north and south poles of Mars, in addition to solid carbon dioxide dry ice, there is also a large amount of condensed brine. Moreover, many scientists have speculated that there should be a large amount of ice deposits beneath the soil layer of Mars. It is just that the depth of its deposits, as well as the reserves of these deposited ice, are not certain.

However, according to satellite imagery, the huge flood channels and dendritic tributaries on Mars have undergone long-term weathering, but occasionally white sediments appear. This is most likely the ice condensed by liquid water.