Updated: 2012-09-28

After giving himself 5 minutes to rest, Zero struggled to get up, even though his body was tired and tired. This underground space seems to be in danger for the time being, but even the underground basin can have the appearance of sea dragonfish, and God knows if there will be other mutant beasts in this underground area. Zero didn't dare to be careless, but before leaving, he still had to deal with his wounds.

Looking at the whitened bullet hole in his right chest, Zero was glad that Parkland's killer was only using a standard sniper warhead, not an armor-piercing or bursting bullet, otherwise his injuries would not have been more than that.

After evaporating the water vapor on his body at a high temperature with the ability formed by the first-order fire element, Zero took out the only remaining disinfectant spray from the marching backpack to disinfect the wound, and without extra bandages, he had to remove one sleeve of his tactical suit, and then cut it with a saber, and then tied it to his body to fix the muscles around the wound from tearing due to the movement of his body. After doing all this, Zero poked into the darkness of the cavern with a glow stick.

From time to time, the cave is filled with tail-finger-sized mutant insects, which feed on sediment. But there were larger ground worms that used them for food, and as Zero passed, he saw several pierced men as thick as arms emerge from some of the holes in the cavern, and then rolled up the little worms and devoured them.

The mutant insects hidden deep underground are extremely sensitive to light sources, and for them, the glimmer of light can be as dazzling as sunlight. Sensing the light source of the glowsticks, the piercers burrowed back into their lair, allowing Zero to drop the 500 revolver and move on.

The deeper you go, the more branches of the cave become, and it looks like the nest of some large ground worm. In this labyrinthine cave, if you take the wrong path, you may never get out. But there was a breeze blowing in the cave from time to time, and Zero had a small flame between his fingers, judging his path according to the direction in which the flame was swaying. And just like that, the labyrinthine cave couldn't stump Zero, and the wind faithfully guided him in the right direction.

Silently calculating his pace, when he counted from zero to one thousand and forty-five steps, his eyes suddenly opened up.

He had emerged from the complex cavern of the branches, but in front of him was an even larger natural cavern. It's hard to tell how big the cave is from the faint glow of the glow stick. But Zero walked along the edge for about 10 minutes, and still had no end in sight, so he had to give up the search. Judging by the sound of the wind whistling through the cave from time to time, it is probably the size of a football field.

Zero held up the glow stick again, and in the dim yellow light he saw the rocks above his head, and the irregular stalagmites. The width of the cave is extremely wide, but the height is limited, about five meters, forming an unusual sense of oppression. From time to time, cold water droplets drip on the stalagmites, which means that there is still a flow of underground water on this layer of stone vines.

Where there is a flow of water, there will be an outlet, but the question is how to penetrate this layer of rock. He walked aimlessly into the depths of the cavern, hoping to find a hole like an outlet. But the water outlet was nowhere to be found, and the glow of the glow stick showed a metallic reflection. Where did the metal come from in the cave, could this be a mine, Zero thought.

The metal reflection light was in the darkness ahead, and Zero quickened his pace. He didn't go very far this time, and after about ten meters, he kicked a strange metal object with his toes.

Zero crouched down, a thin slice of metal, shaped into the shape of a feather. The metal sheet is carved by an erosion process that resembles a circuit crystal plate, and a black-purple spar embedded in the end indicates that it is not a natural product.

As the glowstick approached the metal plate, he saw a faint flash of brilliance from the hedron embedded in it. Following the flow of this silk brilliance from the lines on the metal plate, the entire metal plate trembled slightly in an instant, like a living thing.

Zero looked at all this in amazement, judging from the slight dimming of the light source of the glow stick, the black-purple spar actually had a similar effect to a solar panel, which could absorb the light source and use it as an energy source. Judging from the tremor of the metal plate, this feather-like object contains three systems: light source absorption, energy conversion and drive.

The process of using solar energy as the main energy source and converting it and driving it is not impossible to achieve it with the current level of technology. However, it requires a systematic unit and structure, and no matter how delicate the processing level is, it is absolutely impossible to organically combine the three systems on this sheet of metal with a length of only one meter and a thickness of no more than 5 millimeters.

And judging by the thick dust on the metal sheet, it doesn't know how many years it has been lying in this dark cavern. As far as Zero knows, the most representative of the energy research results published by the Dark Council is that the magnetic energy motive group can only support its own energy action for about ten years without receiving additional energy supply.

However, this piece of metal, Zero believes that it has existed in this cavern for more than ten years, if not longer.

So, what kind of organization's masterpiece is it? Is it a product of the new era, or is it the crystallization of the science and technology of the old era? But Zero believes that even if the resources of the old era were abundant, there was not enough scientific and technological support to produce such metal sheets.

And further along, there are more and more such metal sheets. They were scattered all over the place, almost like the wings of some kind of prehistoric giant bird.

Eventually, a hundred meters from the discovery of the first flam, Zero stopped, and a huge wing covered with the metal flakes fell limply to the ground, from which the flakes had fallen off, and Zero could even see the metal bracket after the flakes had fallen off. This metal wing, modeled after the wings of a flying bird, reminded Zero of a term.

Bionic technology!

Biomimetic technology, although it has been used in the old era, has not yet reached the level of craftsmanship of this metal wing, let alone the ingenious system on the wing. Ignoring the limited number of glowsticks, Zero took out the rest of the glowsticks, and after they lit up, Zero threw several glowsticks in different directions.

So, a picture appeared in his eyes that he couldn't believe it.

What appeared in front of Zero's eyes was a strangely shaped flying machine. It is the size of a ship in the old days, with a U-shaped design at the front and a streamlined fuselage at the rear. The entire craft was covered in sludge, and part of it sank into the rock formations above, as if it had been stuck in a cave.

The sides of the craft were each loaded with three huge metal wings, all of which were now hanging limply on the ground. However, after coming into contact with the glow of the glow sticks, the light source absorption system on the metal wing naturally acted, but the metal wing only vibrated slightly and then quieted down. At the same time, all of Zero's glow sticks were extinguished, due to the fact that the light source was absorbed by the metal wings.

Zero took a glow stick and carefully moved away from the big wings, so that even Zuihou's light source disappeared.

He was almost certain that neither the aircraft itself nor the metal wings were a product of the new era or the old era. So which civilization does it belong to?

Is it an alien civilization, or is it some unknown relic of Earth's history?

For a moment, the flying machine attracted Zero more than leaving the cave. It was as if he was standing in front of a great mystery that Zero wanted to solve right away.