The military mecha piloted by Mark is designed for combat, and the efficiency of digging the ground is very low, in order to save Mark before, Sun Tan emptied all the ammunition in the weapon compartment, and now they can only dig a little bit, the signal displayed on Sun Tan's detector is very obvious, it is underground in this area, and the error is no more than ten meters.

Mark, who has been mining for a long time, also found that this land is abnormal, the geology on the surface of the moon is much denser than that of the earth, just find a piece of land to dig down, there is no rock that cannot be dug up, layers of underground rock layers are the most headache for miners, the hardest strata can break the mine drills, but this area is soft geology, digging down to ten meters is also soft lunar soil.

Mark unloaded the bullet firing compartment on one side of the mecha and built a simple shovel, operating the machine to dig quickly, under the continuous turning of the iron sheet, the white lunar soil quickly flew, fluttering into a ribbon-like trajectory in the air, and floated high into the air, Mark would avoid this when he was working in the past, so as not to cause a malfunction caused by the lunar soil entering the machine, but now he can't care so much.

Sun Tan and Nina continued to look for clues nearby, Sun Tan found that the signal underground was moving in a certain pattern, he couldn't grasp what its pattern was, it should be some kind of big loop, it was definitely not random, but there were too many influencing factors to accurately measure clearly.

The blue arcs in the sky are still hanging there, the new life has reached the moon, after entering the lunar orbit, the fleet will use the lunar gravity to correct the angle, and then go straight to the earth for support, this process should last for a long time, the people on the fleet do not know what is happening on the earth, they will first investigate the mysterious white square, and try to establish contact with the earth.

As for why they didn't communicate with the moon, the reason is not known yet, but since they are willing to come back, it proves that they haven't given up on Earth yet.

Soon Mark cleared a large excavation area, and now he was more sure there was something wrong with it, and the area he cleared took on a vague circle, probably a huge hole that had been buried by weathering and gradually becoming what it is today.

"Sun Tan! Nina! Come up, we rush straight down. Mark called out to them over the communicator, he felt the vibration of the machine, there was only a thin shell underneath, he had no idea what was underneath, but there was no chance to turn back now.

"Did you find it?" Sun Tan jumped into the cockpit excitedly.

"Hehe, I'm not wrong!" Nina had a smug expression on her face and smiled very brightly, and when they entered the mech, Mark closed the hood on the cockpit, and Nina took off the hood of her protective suit, and her hair flew lightly.

"That's it, you see." Mark slapped a button, a piece of green flashed on the display screen of the mecha, it slowly advanced to the area in front, about ten meters deep before the green disappeared, the front became a cloud of pitch black, Mark pointed to the screen and said: "This is empty, there is no trace of reflection of the detection wave, and it is not small inside." ”

"Let's do it!" Sun Tan tightened his seat belt.

"Sit tight !!" Mark turned on the mecha at full speed, and the metal beast weighing 100 tons let out a strong roar, increasing its horsepower and rushing towards the ground, the metal tracks under the mecha's feet stripped off the lunar soil layer by layer and threw it behind its back, as if dragging two long slow belts, when it was close to the bottom, Marco pulled up the arm of the mecha, and the mecha quickly crossed its arms in front of it and slammed into the ground.

As Mark had predicted, there was only a thin shell underneath, and they only felt a slight obstacle, and in an instant, they broke through the formation, and the mech quickly crashed into an open space, shocking them by the sight in front of them.

The mecha slowly fell down as if it was floating, Mark suddenly felt a sense of weightlessness, as if he would never fall to the bottom, the height number on the dashboard was indeed decreasing, but Mark's perception had become illusory, and the others felt the same.

The world in front of them turned pure white, a little white, they didn't see any light source when they were above, if there was really such a strong light below, Mark had already dug so close, how soft the stratum here was, there should be a lot of light through. What's even weirder is that Mark looks at the mecha as a detector, and the screen is pitch black, proving that the camera doesn't catch any light, but their eyes see the light.

Mark doesn't know how to explain all this, just like he doesn't know how to explain whether he is falling now, Sun Tan and Nina are much smarter than him, and now they are also in a state of confusion, maybe this is the trace left by the advanced civilization, what seems to them to be ordinary things, for us are great miracles, if you show mobile phones and flying machines in front of primitive people, they will not be able to understand the principle of these things, they will only treat you as a god.

Mark now understands this feeling, and when his eyes gradually adjust to the white light, he realizes that the surroundings are not pure white, and he sees countless tiny circuits on the wall that are moving, looking like circuits, but circuits of this structure don't make sense at all, and pale blue light flows in the circuits.

Even if he couldn't read it, Mark still felt an inexplicable sense of beauty, and he couldn't say it himself, but after staring at these blue lines for a long time, he would unconsciously sink into them, and he couldn't take his eyes off them.

Science is beauty itself.

The design of the boat is the most in line with the state of fluid mechanics, that is, it is the most beautiful design, and people think that the standard movements of sports are beautiful, but also because they are the most human-mechanical movements after thousands of tests, and the works of art throughout the ages are close to the golden ratio of mathematics. When people think that something is very beautiful, it must be that it secretly coincides with some kind of scientific connotation.

Just like these mysterious blue lines that Mark saw at this time, it feels very close to the mysterious cube that hijacked the earth, minimalist, perfect, and standard, which is the transcendent sanctification after the development of science and technology to the extreme, cutting out any superfluous things, and only retaining the most essential and fundamental content.

When the wires can evolve like this, without any conductive dielectric guidance, the electrons are arranged one by one, and move in the way people need, then the day will mankind reach the realm of this mysterious prehistoric civilization.