When he came back to his senses, Lei Luo glanced back at the back, but saw that the direction he came, the place where his teammates gathered, the faint light of the fire emitted by the bonfire had completely disappeared.

Judging from the degree of leaning of the body along the way, and the feedback from the feet, the depth of this cave seems to be a slope leading to the ground.

"Is it so deep in here?"

Feeling his body leaning forward slightly, Lei Luo turned the chakra to concentrate on the soles of his feet, and only after stabilizing his posture did he look around again.

It seemed to be deep underground, and the walls of the cave were no longer hard rocks, but the earth with a faint damp feeling, and it was pitch black all around, except for some ore emerging from the soil on both sides, still emitting a glowing glow, barely used for lighting.

But compared to the stalactite cave on the surface, which is mostly made of crystals and has different colors, the color of the ore here is quite monotonous, and the light emitted is much dimmer.

All of them show a dark green with a light yellow glow, faintly revealing an asphalt-colored luster, which looks very weird and gives people a somewhat eerie feeling, like ghosts.

For a moment, Lei Luo only felt that the whole body of these ores exuded an inexplicable strange meaning, and it gave him a vague sense of familiarity.

So, he casually pulled out a fist-sized piece of green ore from the soil beside him, and took it to his eyes to observe it.

"This thing, where should I have seen it......"

Fiddling with the ore in his hand, looking at the pale green glow emanating from its surface, Relo quickly searched his brain for the exact source of that familiarity.

One second, two seconds...... One minute, two minutes......

It wasn't until more than ten minutes had passed that Lei Luo suddenly remembered where he had seen this ore.

If you guessed it right, this thing ...... It seemed to look a bit like the ore he had seen in a certain scientific research impurity in his previous life, and on a certain mission, he also happened to see this ore with his own eyes and touched it once.

Whether it is in terms of shape, color, touch, and spiritual feeling, the ore in his hand seems to be extremely similar to the ore in his previous life.

Could it be ......

"It's ...... Uranium ore? ”

Lei Luo narrowed his eyes, carefully looked at the light green stone in his hand that showed a faint transparency, like a crystal, and muttered a question in his mouth, and the palm holding the ore trembled slightly unconsciously.

But at this time, naturally, no one answered him.

So, in order to verify his guess, Lei Luo decided to conduct relevant experiments as soon as possible to determine whether the ore in his hand was the kind of uranium ore he had seen in his previous life.

If it's really uranium ore...... Lei Luo's eyes flickered wildly, and he forcibly suppressed all the thoughts that came to him, and began to recall some of the experimental procedures he had learned in his previous life.

It was rare for Lei Luo to be so excited, and there was only one reason why his mood could be shaken so much:

Uranium ore is the main raw material for the manufacture of nuclear weapons.

If you briefly explain the principle of this, first of all, uranium ore is a dangerous mineral with radioactive properties.

Uranium is an extremely rare radioactive metal element, with an average content of only 2 parts per million in the earth's crust, making it extremely valuable.

Uranium mainly contains three isotopes, namely uranium-238, uranium-235 and uranium-234, of which only uranium-235 is a fissile nuclear element, which can undergo a chain nuclear fission reaction under neutron bombardment, and can be used as a nuclear charge for atomic bombs and fuel for nuclear power plant reactors.

Relevant information quickly flashed through Lei Luo's mind, he held what appeared to be uranium ore in one hand, and the other hand quickly formed several imprints.

"Water escape. The Art of Fog Concealment. ”

Silently, a faint mist shrouded the dim underground space, obscuring most of the light emitted by the surrounding ores, and only the faint light could barely be seen.

The Misty Concealment Technique was obtained by Lei Luo by searching the memories in the shark's head, but this technique was really useless to a ninja of his level, so he never used it in battle.

However, now it can be used for experiments, and it can be regarded as waste utilization.

In order to better observe the nature of the ore in his hand, Lei Luo made some adjustments to the mist concealment technique he cast, reducing the output of his chakra, so that the concentration of the mist emitted by it was not high, so as to form an experimental environment that he could use in his previous life to detect the presence of nuclear radiation - that is, the cloud chamber.

This is done in order to better observe every subtle change of the ore in the water mist, and strive not to miss a single detail.

Lei Luo's eyes widened, and with the faint glow of the other ores around him, he stared at the ore in his hand and the curling mist floating around it.

In the slightly dimly lit space, Lei Luo stood quietly in place, keeping a firm eye on the ore and the fog around it, without any impatience in the process.

He was waiting, waiting for change to happen, waiting for the ore in his hand to reveal its true nature.

Namely, radioactivity.

About a few minutes passed, and suddenly, Lei Luo's eyes froze:

He saw an invisible, extremely tiny pillar of air emanating from the surface of the ore and flying into the surrounding mist, disappearing after a short distance of a dozen centimeters.

This column of air, it is a force, a force that emerges out of thin air, a transparent, like an air bomb.

It's incredibly fast, fleeting.

The reason why he was able to detect its existence was because Relo noticed:

In the mist, the path it passed, leaving a tiny trail along the way, a trail that was almost imperceptible to the naked eye, like some ant, or even a smaller transparent substance, suddenly passed there.

Immediately after, this first wave was like a fuse, and after it streaked a transparent trail through the mist, more invisible fluctuations burst out of the surface of the ore.

The scene at this moment was as if the ore suddenly turned into a sun that constantly emitted Dao light, sending countless invisible forces to all sides, leaving a dense vacuum trail in the mist.

For example, countless invisible mosquitoes and flies quickly burst out of the surface of the ore, and after a short distance, they left extremely small tracks in the mist and then dissipated.

Seeing all the changes in the vicinity of the ore, Lei Luo finally came to the conclusion that the ore in his hand was the famous uranium ore in his previous life.

And the countless fluctuations that continue to emit into the mist also have a famous name in Lei Luo's previous life: that is, nuclear radiation.

After the chakra in the Fog Concealment Technique gradually became unsustainable, and the water mist around him gradually dissipated, Lei Luo was speechless for a long time holding the piece of uranium ore that seemed to have returned to normal on the surface.