Highly toxic substances.

After some discussion, the group decided to go to the back mountain to see what the so-called ghost actually looked like.

Led by the little boy, they climbed for more than ten minutes to reach the mountainside.

Through the moonlight, they could see spirit houses scattered around.

The land here had not yet been developed, so there were still many traditional earth mounds serving as graves.

Many water-soaked joss paper money lay scattered on the ground.

Walking on it felt like stepping into another world.

At this moment, even the slightest rustle could scare them half to death.

After weaving through the graves for a while, suddenly!

The oldest child pointed upwards and excitedly shouted, “Look! That tomb is open again, and there’s light inside.”

Hearing this, Lin Yuan and the others immediately looked in the direction he pointed.

Sure enough!

A seemingly ancient tomb, with a rectangular concrete burial chamber, had its coffin pulled out.

The burial chamber was lit up, and faintly, a hole could be seen inside, leading to who knows where.

The Photographer, seeing this, was already so scared his legs were weak, and he stammered in terror, “This… this couldn’t be a passage to the underworld, could it?”

Lin Yuan rolled his eyes at him: “What are you thinking?!”

Director Yu nodded: “It should be grave robbers, but what puzzles me is that this tomb doesn’t seem that old, and they haven’t even opened the coffin. I don’t understand it.”

“Who said the grave robbers are targeting this tomb? Didn’t you see the hole inside the burial chamber? I estimate this is just a tunnel they dug,” Lin Yuan slowly explained after a moment of thought.

Director Yu nodded thoughtfully and asked, “What should we do now? Go take a look or call the police directly?”

“Let’s go take a look first. If they really are grave robbers, and they’re digging a tunnel here, aside from covering their tracks and scaring people, I can’t think of any other reason.”

After a brief discussion, the two voluntarily walked towards the tomb chamber above, no matter how much the Photographer protested.

However, as Lin Yuan approached the tomb chamber and looked down into the passage, he instinctively sniffed.

His brows slowly furrowed, as if he smelled a bitter almond scent.

This was puzzling.

Where would such a smell come from in a tomb chamber?

But the next second, he suddenly thought of something.

His pupils suddenly constricted, and his face changed drastically!

He frantically retreated backwards, shouting at the same time: “Don’t get close, don’t smell it, retreat quickly!!!”

Hearing this, everyone retreated without thinking, scrambling back.

They stopped, gasping for breath, only after retreating dozens of meters, still feeling lingering fear.

Director Yu came up to Lin Yuan and asked with a serious expression, “What’s wrong?”

“Something’s not right!” Lin Yuan frowned and replied thoughtfully, “This shouldn’t be grave robbers!”

“It’s not?” everyone exclaimed in unison.

“Right!” Lin Yuan slowly explained, “If grave robbers dig a tunnel, it’s either with explosives or pure digging. But no matter which way, it would smell of gunpowder or damp earth.”

“But just now, I smelled a bitter almond scent!”

Hearing this, the Photographer nodded his head like a rattle drum: “Yes, yes, I smelled it too. I thought it was strange just now, so pungent and unpleasant, like a chemical smell.”

“Exactly!! This is the smell of chemical gas!”

“This…” Director Yu was also stunned.

The plot development was completely different from what he had imagined.

He had thought it was grave robbers, but now it seemed highly unlikely. Could there really be ghosts?

“Even if there’s a chemical smell, is there any need to run? Is it poisonous?”

Lin Yuan nodded with a serious expression: “This smell is very similar to a gas I remember, called hydrogen cyanide gas. It’s highly toxic!!”

Hearing the words “highly toxic,” everyone’s faces instantly changed, turning pale in a flash.

The Photographer’s pupils dilated even more, and he quickly covered his mouth and nose, stammering, “Then, did we just inhale it? Are we poisoned?”

“Not necessarily!” Lin Yuan explained with a smile, “The smell we detected was very faint; it must have come from inside the hole.”

“This gas has a very low boiling point, only 25 degrees Celsius. Once inhaled, mild poisoning causes dizziness, nausea, chest tightness, etc. If the concentration is high enough, one breath can cause immediate poisoning and death. Even with a gas mask, one wouldn’t survive!”

The Photographer was stunned.

His heart had instantly relaxed a lot after the first sentence, thinking it was fine.

But then the next sentence told him that if the concentration was too high, one breath could kill him? And a gas mask wouldn’t even help?

How terrifying must this poison be?

The netizens in the live stream were also shocked.

[Popularity] +1+1+1+1

— [Hydrogen cyanide gas, oh my god, ordinary people can’t even come into contact with this. Why is it here? It’s a good thing those kids were timid and didn’t come over to look, otherwise, they’d probably all be dead.]

— [Is it that scary? More potent than a cobra’s venom? You can die even with a gas mask? I don’t believe it.]

— [One can only say ignorance. The chemical toxins developed by humans far exceed your imagination. This poison, let alone a cobra, even the most venomous snake in the sea is a mere junior compared to it.]

— [I don’t understand anymore. Weren’t they here to sell houses? Why does it feel like they’re here for an adventure?]

After listening to Lin Yuan’s explanation, everyone finally understood why his expression was so exaggerated and why he ran so fast just now.

It was no joke; if they weren’t scared at this moment, they would be fools!

However, what puzzled everyone was why there was such highly toxic gas in this hole. Could there be something special down there?

Regarding this, Lin Yuan slowly explained, “Originally, I couldn’t be sure it was hydrogen cyanide gas, but when I thought of another special place on this mountain, I immediately confirmed it.”

The Photographer asked in surprise, “What special place?”

“An abandoned gold mine!!”

Lin Yuan continued to explain, “With an abandoned gold mine here, the appearance of this gas is not difficult to understand. I can now confirm that this hole was not dug by grave robbers, but by gold thieves!!”

“Gold thieves?” Director Yu and the Photographer were both confused, asking with puzzled expressions, “Didn’t you say it’s an abandoned gold mine? How can they steal gold?”

Looking at their expressions, like curious babies, Lin Yuan smiled and asked in return, “Do you know why an abandoned gold mine is abandoned?”

The Photographer replied blankly, “Because the gold was all mined out, so it was abandoned.”

Lin Yuan smiled and shook his head: “Not at all!”

“Firstly, mining gold has a cost, and it’s a very high cost.”

“Initially, when new gold mines are discovered, the gold particles are relatively large and easier to mine, so they are basically extracted using large machinery and manual digging.”

“Once the large particles are extracted, only very small gold particles remain, mixed with soil and rocks. Not only is normal mining difficult, but the cost is also high. At this point, further mining becomes unprofitable, so it becomes an abandoned gold mine!”

After listening to Lin Yuan’s explanation, everyone suddenly understood.

Director Yu thoughtfully said, “So, you mean there are still some tiny gold particles inside, but you just said that manual mining is difficult, costly, and not worth it. So, why would anyone bother stealing it?”

Lin Yuan smiled faintly: “That’s because they are using an illegal method, a folk method for mining gold.”

“There’s a saying, ‘A gold mine is worth millions, just wash the hole and turn it over.’ Have you heard of it?”