There is a medium-sized bus parked outside the hotel door.

After putting the luggage in the trunk.

Iwanaga Joji drove everyone along the coast. On the way to the B&B, he introduced:

"...About 270 years ago, during the Edo Kyōho period, it is said that the underwater palace was still above the sea level at that time. It was not built by aliens. The SS scimitar and pistol. From these two weapons, Judging from the abbreviations 'm' and 'a', their owners should be the two female pirates led by Captain Jack Rickman, Ann Bonny and Mary Read, who were active in 1730."

"Oh, I seem to have read a similar story when I was a kid..."

Mouri Kogoro asked doubtfully: "But I remember, weren't the two of them arrested?"

"That's right, the two of them were imprisoned in a prison in the Bahamas. An, who escaped first, moved the location of her activities to the Pacific Ocean, waiting for the rumors of Mary's escape from prison while acting as a pirate..."

Iwanaga Joji said:

"Later this incident was confirmed, and news spread that the treasure was hidden on this divine island."

"So, the silver tableware found in the underwater palace is real?" Mao Lilan asked.

"Maybe..."

Iwanaga Joji did not give a definite answer, "After all, everyone spreads it like this, so there shouldn't be anything wrong."

"Then what's going on with the underwater palace?"

Kogoro Mouri wondered, "If it was still on the sea level 270 years ago, has it sunk now?"

"Yes, you can look to the left now, in the direction of 10 o'clock. Isn't there an uninhabited island over there?"

Iwanaga Joji continued to introduce:

"It's called Norichijima Island. Starting from it and continuing to the east about 200 meters under the sea, there is a building made of huge rocks that sank. About 10 years ago..."

He briefly recalled:

"At that time, there were rumors that diving enthusiasts had discovered ancient ruins there. Although many scholars have investigated it, there is still no accurate conclusion as to whether the building was man-made or naturally formed."

No conclusion?

Ye Geng said softly:

"I'm probably saying this because I've been given a favor. After all, it's rare to have a hot topic that can be used as an anchor for the development of tourism. Otherwise, I should really doubt whether those scholars and experts who can't even distinguish artificial buildings are liars." Or grave robbers in disguise."

"Well……"

Iwanaga Sōji's subsequent words were choked back, and he twitched the corner of his mouth and said truthfully:

"I think so too, but as the head of the tourism department, when dealing with tourists, I always have to tell bizarre stories to facilitate publicity. Otherwise, it will have a huge impact on our tourism industry..."

"So, that underwater palace was a ground-level building from the beginning?"

Mouri Kogoro looked through the glass at the uninhabited island with dense trees.

Just at this moment, a sightseeing boat crossed their car from one side of the coastline. On top of the sightseeing boat, three or five men and women were vaguely visible, holding cameras and taking pictures of the surrounding scenery.

"There is no mystery at all..." A certain tool man curled his lips.

"Ahem..."

It was obviously the first time for Iwanaga Joji to meet such a real customer, and he did not dare to use the legendary story with a bit of fantasy color to promote it, so he continued to introduce:

"The part of Norichijima Island that was exposed to the sea was much larger than it is now. It became what it is now because of an earthquake 300 years ago..."

"Is the surface sliding caused by an earthquake?" Conan was curious.

"Uh, yes."

Iwanaga Sōji was startled for a moment...this kid again, he really knows a lot.

He paused calmly and explained:

"I heard from experts that there seems to be a so-called methane hydrate layer on the seabed nearby. Because the vibrations caused by the earthquake completely decomposed the methane hydrate layer, which caused the surface to slide."

"What is a 'fake hydrate layer'?" Yuantai had a question mark on his head.

The female pirate at the beginning and the mysterious undersea buildings were quite attractive, but why did the conversations between them become incomprehensible after Brother Gengyi opened his mouth?

Looking around the car, I found that except for Dr. Agasa, Ai Haibara and Conan, everyone else including Mao Lilan and Suzuki Sonoko also had blank faces.

Ye Gengyi took the initiative and said:

"Methane hydrate, also known as flammable ice. Its chemical formula is ch4·xh2o. It is a clean energy source. Its main components are methane molecules and water molecules. Its formation process is similar to the formation process of seabed oil and natural gas. It is probably buried In an anoxic environment, anaerobic bacteria decompose a large amount of organic matter deep in the seabed strata, and finally form oil and natural gas. Most of the natural gas is encapsulated in water molecules, forming "combustible ice" under the low temperature and pressure of the seabed. ". This is because natural gas has a special property. It and water can crystallize at a temperature of 2-5 degrees Celsius. Because the main component is methane, it is often called "methane hydrate" because it will decompose into methane hydrate at room temperature. Water and methane, so all it takes is enough outside intervention to cause a collapse."

"Combustible ice..."

"c...cwhat2o?"

"Anaerobic bacteria?"

"Organic matter..."

"Cryogenic pressure formation..."

"I still don't understand it at all..."

A group of people continued to look blank.

Haha, I knew it... Conan sweated and spoke subconsciously:

"Brother Gengyi said it is too complicated. Let me give you a simple example. Everyone has played poker, right?"

Seeing everyone nodding, he continued:

"Suppose we build a triangular castle with playing cards. The water molecules represent the playing cards, and then put methane in the gaps between each playing card. So once the temperature rises or the pressure drops, the structure of the castle will change. It's very unstable and eventually the whole castle will collapse and release methane gas."

"I see, Conan, you really know a lot, but I still feel that Brother Yi's explanation should be more professional."

Guangyan sighed with emotion at first, then turned to look at Ye Gengyi with an expression like a little fanboy, and said:

"I will definitely follow my brother Gengyi's lead and learn this knowledge in the future!"

"Well, come on." Ye Geng nodded.

Then become a cadre of the black organization?

Haiyuan Ai's thoughts went astray and he coughed hard to remind two people in the car to be careful.

"Well……"

Conan came back to his senses, realized Mao Lilan's gaze, and quickly explained: "This...this is what I learned on TV last time."

"Is it a scientific exploration column?" Ye Gengyi asked.

"Ah? Yes, it should be..." Conan sweated.

Is it possible that I’m going to hit Brother Gengyi’s gun today?!

"Ahem...you don't watch much TV at all, right?" Haiyuan Ai couldn't help but tell the truth.

She didn't want to defend Conan, after all, the detective's memory of 'loving to show off' was really only slightly better than that of a goldfish.

In this way, before encountering a truly overwhelming danger, it is better to let Brother Geng give him a little lesson from time to time...

But isn’t it a bit inappropriate to choose this time?

Mao Lilan is staring at that stupid detective now!

Haibara Ai was very worried that if Brother Gengyi's bad taste was too strong, he would be unable to contain it for a while, causing that guy to reveal a flaw. In order to make up for the flaw, he had to use aptx-4869's antidote and let Kudo Shinichi appear again to resolve the flaw.

crisis.

And based on past experience, when that time comes, no matter how much warning is given in advance, as long as the forgetful detective returns to his original appearance, he will definitely forget about it and cause trouble.

The final result is that either they will be implicated together, or they will have to spend a lot of time to help them make up for the loopholes again. It shouldn't be too much trouble!

Here, Ye Gengji just calmly said "Oh" and said:

"Oh...that's right. I don't need to learn this basic chemistry knowledge from TV."

Um?!

Conan directly misunderstood and was shocked... Could it be that Brother Gengyi was testing me?!

Haiyuan Ai was also startled, and quickly raised his head to stare at a cadre of a certain organization.

I cursed in my heart, could this be what is said in the legend - as long as I doubt him, he will not doubt me?

"but……"

Ye Gengyi changed the topic unmoved and said to the two female high school students:

"Knowledge lies in accumulation, and it is not a bad thing to increase memory. Xiaolan, Sonoko, what are your chemistry scores? How come you don't even know what methane hydrate is?"

"Ah this..." The two girls sweated simultaneously.

On what to do if your teacher suddenly checks your homework while traveling...

－－－－－－Digression－－－－－
Chapter completed!