The dense tree-shaped fan blades swirled with the oncoming wind, and the boys and girls continued to move forward with the clearer and clearer singing on the radio.

"Ahh This place is very similar to one I saw in a book! Qianhu said, looking at the wind turbines around him.

"What a place, Chi-chan!"

"The forest!"

"Forest? And the jungle is the same thing? Yuri continued.

"Yuri, the forests were scattered in various areas before the destruction of the earth! Jungles, on the other hand, can only be found in tropical or subtropical regions. The boy corrected.

"Huh~~~ What are the tropics and subtropics?" The blonde girl continued.

"Well! To put it simply, it's a relatively warm place all year round. Especially in the tropics, the temperature is kept in the mid-teens Celsius all year round, and it never snows. The boy explained.

"That's amazing! There is still such a place! …… There must be a lot of creatures that make up the food chain! Yuri said.

"Hmm...... Well! That's right! ”

The car kept moving forward............

"But how did you get to be the way you are? We can look at these (pointing to wind turbines) and think back to the forest. Yuri asked.

"Who knows? It must have taken a long time to form! ”

Chiho answered Yuri's question and ran over a wind turbine that was lying on the ground in a half-track.

"No one knows what happened before...... That's why we have books and stuff like that! She continued.

"Ahh But even if we don't understand the past, we can at least understand the future! If there's enough time............" Yuri said, feeling the weightlessness of her body as the car tilted.

"Well............ If he was still alive at that time............ This. ”

There were some wind turbines in front of them one after another, and these motors formed one after another hurdles that were not considered hurdles, and Qianhu was as skilled as he had done before.

"Compared to the things we know, our human lifespan is too short............" said the boy with emotion.

The cookie-cutter scenery always makes people feel tired easily, and this is probably the reason why Yuri can't help but fall asleep! Of course, Nuko, who had been taught by Yuri, also fell asleep on the side of her head.

"Uh-huh............" The sleeping girl is woken up by the car that suddenly stops!

"What's wrong? Is it a dead end? She asked, rubbing her sleepy eyes.

"Nope! Although there is an exit............ "Chito looked at the huge object in front of him, and stopped talking.

"Na! Are the radio waves coming from that direction? The boy asked Nuko behind him.

"Yes. That's where it ............."

"Ahh Yuri looked in the direction the boy was pointing, startled by the object that appeared in her eyes. "I guess it didn't come out of that............"

“…… Probably yes......" Yuri's guess was answered in the affirmative by Nuko.

Qianhu drove out from the exit on the side, and the group looked at the behemoth not far in front of them in a daze. The behemoth that appeared in their eyes had a pitch-black appearance, a round body and blunt ends, and it would not be any different from a cigar if it were not for the fact that there was a part resembling an oblong canned fish at the top of the middle part of the body.

"It's ...... Submarines? The boy looked in amazement at the huge object that was supposed to be underwater.

"Submarines?"

"You can think of it as a boat moving underwater!" The boy roughly answered Yuri's question.

"Qianhe, since the radio waves are coming from inside, let's go over and take a look!"

"Okay, Fubo." After Chito finished speaking, he drove the car back to the front.

The short journey of a few hundred meters was quickly completed, and the parked Qianhe immediately took out his camera and took pictures of the submarine that was getting bigger and bigger as he approached. Yuri behind her called out to Nuko, who was lying on the edge of the car, and only after she got into the backpack behind her did she follow the boy and Chinohe up the hill to the top of the submarine, which she had probably installed later.

"Na! You~~ What came to mind at the first glance when you saw this? ”

"It looks big, it's powerful, I know it............ But the first thing that comes to mind is weapons! ”

Receiving Yuri's answer, Chiho nodded, and with the help of the boy, climbed the mountain and climbed the ladder that could be the entrance.

"This should be the entrance......" Chido tried to turn the open valve.

"Can't you open it?"

"Looks like it's locked!" The boy said, looking at the key in the middle of the valve.

"I know............" Nuko, who had somehow come out of Yuri's backpack, came to Chino's side and stretched out a forelimb to the keychain on the valve, and she inserted it in the shape of a key.

"Click! Click! "With the rotation of Nuko......'s forelimbs, the valve snapped open after a while, and a shaft appeared in front of the three of them.

The three of them carefully examined the situation inside the shaft, and finally, driven by curiosity, the young man took the lead and crawled down the shaft. The pipes that formed the shaft disappeared upon entering a room, leaving only the ladder that continued downward until it reached about half a meter above the ground.

"This place is still functioning!" The young man who came down first said, looking at the bright monitors around him.

"Chi-chan! There's a voice. ”

"Hmm!" The thousand households that have gone down to the bottom answered the channel.

"And the lighting!" Yuri, who had just walked down at the end, looked at the room illuminated by the light of the monitor.

Chirp chirp............ The monitors are constantly making noises, indicating that they are still functional, but the people who used to operate them no longer know where they are. The trio passed by the engine room, walked past the nuclear fuel room, which had been converted into an energy source for weapons, and finally came to what appeared to be a dining room.

There are tables and chairs in the dining room, and the tables and chairs are made of different materials, and the tables are made of metal in order to be sturdy and durable, presumably to prevent the submarine from sliding with the shaking hull of the submarine as it runs underwater, so these tables are screwed to the floor. The chairs, on the other hand, are not made of metal for ease of movement, and certainly not any of the materials known to the boy, they are neatly stored under the table.

The three of them, who were a little tired from shopping, planned to fix up in this restaurant, and they all found their places.

"Let's not talk about those inexplicable machines." Yuri pulled out a chair and sat down, saying, "This place is really neat! ”

"Well! After all, it's been closed............"

The boy and the two girls sat in the dining room and rested for a while, continuing to explore the next area.

This submarine was already quite huge from the outside, and when the three of them climbed in, they intuitively felt the spaciousness inside. The vast interior is divided into separate areas, which are connected by passageways for only two people to move side by side. It was a very peculiar experience for the three of them who entered this kind of place for the first time.

They kept going, hoping to find something............