"Hurry up!" Smiley Face called out, leading them to the bottom of the dune and running into the depths of the shadows.

When they got closer, they discovered that half of a small city was buried in the shadow of the sand dunes.

It seems that this place was once a settlement in the desert, or the tip of the iceberg of a desert country.

Who knows?

Soon, a helicopter flew over from the air and climbed over the sand dunes.

The pilot flew the tool around the shadow of the desert and found nothing.

It doesn't know how to judge or think, it only knows how to follow orders. Since it didn't find the enemy, it just reported to the soldiers.

The girls from the sea area who arrived here one step later were also confused.

Although the helicopter did report that it had spotted the rangers in the flower district, behind the sand dunes was just an ordinary ruin.

Who is this person?

They seemed to have searched the ruins several times, but still could not find the girl from the flower district.

What about people?

Five meters underground, Xia Shu and others looked at the bluestone slabs above their heads with nervous expressions.

Someone asked, "Will we be discovered?"

"Shh, don't talk." Qingxian warned in a low voice.

They couldn't see anything here, it was very dark and narrow. Qingxian was not sure if the people above could hear them.

But they could hear the sound of helicopter propellers, as well as the voices and footsteps of the soldiers in the sea area.

There is a high possibility that the other party will discover them.

If this stone slab is lifted, Qingxian will have no choice but to let them surrender.

At this moment, Smiley Face whispered from behind, "Come here quickly and follow me."

From what she said, it seems like there's a tunnel behind this?

The girls felt the wall and moved slowly towards that side. Someone said, "I can't see anything."

Smiley thought for a moment and quickly said, "Come, hold hands one by one and I'll lead you away."

So they held each other's hands, formed a long line, and walked forward with smiling faces.

"Human centipede." Xiaotang suddenly said.

"What?" Xia Shu turned his head and looked at her in the dark.

"Nothing." Xiaotang's eyes reflected a strange glow in the darkness.

The girls followed the smiling face and quickly went deeper into the dark tunnel.

Gradually moving away from the original corner of the ruins.

Looking at the endless darkness ahead, Qingxian couldn't help but ask, "Where...is this place? There's no such secret passage marked on the map."

Smiley Face smiled as he walked back, "It's a secret passage in the ancient ruins. I discovered it myself. Of course it's not on the map."

"Ancient ruins?" Viper's tone was filled with doubt.

"The empire beneath the yellow sand? Look, aren't such ruins often found in picture books and novels?" Smiley Face replied.

"So where does this place lead to in the end?"

"It leads to many places. However, most of the exits are buried in sand, and only a small part of them are usable."

As she spoke, she gradually quickened her pace.

"Let's hurry up. I have a feeling they'll find this entrance and catch up with us from behind."

The girls were silent and tried to hold on to the hands of the people in front of them in the dark.

At this moment, an explosion was heard from behind, and yellow sand fell overhead.

It seems that the group of girls in the sea area want to use explosions to find out where they are going.

Now, they all became nervous.

337. Not all underground passages are underground mazes

"Don't worry." Smiling Face seemed to sense their nervousness and immediately said softly, "The terrain down here is quite complicated. It's hard to figure out the way without studying it for a while."

As he spoke, he turned a corner and reminded the others, "Turn right."

Seeing this, Viper asked, "Are you familiar with this place?"

"Yeah, I'm quite familiar with it. I often walk here." Smiley replied.

"Can you tell me how you found this place?" Viper asked again.

"Hmm... this is quite a coincidence." Smiling Face spoke more slowly, "You know, there used to be three oil wells in our war zone, right?"

"I know, the southern desert oil wells A, B, and C, right?" someone answered quickly.

"That's right, and there were three squadrons stationed there before, and ours was one of them."

"My Little Pony Squadron?" Qingxian asked.

This squadron is the one that won the Silver Military Medal last time.

"Yes." Smiling Face confirmed and continued, "Before the war, I defended this desert for half a year, and when I had nothing to do, I would go out for reconnaissance.

“You could say I’ve traveled all over this desert in a few months, and I’ve been to all the strategic spots marked on the map.

"Then one day I thought, with so many ancient ruins in the desert, is it possible that there are treasures hidden somewhere?

“So I went through all the ancient ruins.

"Later, this underground passage was discovered."

"Oh..." Xiaotang said suddenly realizing, "So you discovered the underground entrance while searching for treasure."

"That's right." Smiley Face said with a smile, and turned them around again.

At this moment, another explosion was heard from the direction of origin, shaking the wall.

There was a noise coming from behind, as if they had discovered the entrance to the underground tunnel.

Qingxian was nervous for a moment, but Xiaolian quickly comforted him, "It's okay. They are not familiar with the underground passage, so they are definitely not as fast as us."

Qingxian couldn't help but ask, "Is the terrain down here complicated?"

"It's very complicated, almost like a maze."

"Then how did you memorize the pass?"

"I've been to every corner here. I even drew a map and will show you later."

"That's awesome." Someone praised.

Smiley Face smiled but said nothing.

After walking forward for a while, I could faintly hear sporadic footsteps from behind.

They were nervous and couldn't help but quicken their pace.

But after a while, the sound behind it quickly became lighter and disappeared.

It seems that the other party really doesn't know the passage below.

As we walked, someone asked, "There are so many tunnels going in all directions down here. Why did the old countries build these secret passages? What was their purpose?"

"For fighting, soldiers can reach every corner of the city from below."

"No, it should be used by the royal family to escape."

"Hide the treasure. Maybe there's treasure somewhere underground."

"Really? Smiley Sister?"

Hearing this, Smiley turned around and said, "No, but there seem to be some very deep rooms. I don't know what they are used for."

"How deep?"

"About ten meters, the kind where you can't see the bottom."

"Have you tried the mechanism or something? The kind that opens a secret door when you press it?"

"I haven't tried it." Smiley said thoughtfully, "Don't tell me, I can try it next time."

"Well..." Viper couldn't help but say, "I've studied a little bit of history..."

"Ah?" Smiley Face asked with great interest, "Do you know what this place is used for?"

"Um……"

"So what is this place?"

"sewer."

"Huh?" Smiley's voice was filled with shock. "A desert country also needs sewers?"

"This wasn't necessarily a desert before," Viper said. "Thousands of years ago, it might have been a forest. Besides, who says a desert country doesn't need sewers?"

"Why do we need sewers in such a drought?"

"To store water," Viper answered seriously, "those deep pit rooms are reservoirs."

"Now that you put it that way, it seems to make some sense..." Qingxian also expressed his opinion.

Then there was a long silence.

A certain awkward atmosphere arose.

There is also treasure.

Fortunately, the smiley face's "Here we are" quickly resolved the awkwardness.

She let go of the girl's hand behind her and climbed up the steps in front of her.

After pushing open the stone slab above my head, a ray of light came through the gap.

Smiley Face observed for a while, and after making sure the ground was safe, he lifted the stone slab and walked out.

The girls following behind also held each other's hands and left the underground tunnel - oh no, the sewer.

Natsuki climbed the steps and offered her his hand with a smile.

She took the other person's hand and climbed up to the ground, saying, "Thank you."

Smiling Face glanced at the bird behind Xia Shu and replied, "You're welcome."

This is also a ruin under the sand dunes, but the desertification is more serious and there is yellow sand all around.

After they crawled out of the ground, their expressions did not look much more relaxed.

Because the sky outside was gloomy and dark, it looked a bit scary.

Qingxian and Xiaolian, who came up last, covered the stone slabs of the sewer together and buried some sand to block the pursuers.

Then they looked up at the sky again, their expressions becoming serious.

"A sandstorm is coming." Viper looked at the sky and said in a certain tone.

The girls looked at each other, and Qingxian asked Xiaolian, "How far is this place from where we were just now?"

"About two kilometers." Smiley Face estimated.

"Is there no way to move forward?" Qingxian asked again.

"How big can a city be? Two kilometers is already the edge of the city." Smiley shrugged.

"Sandstorm... the road is difficult to travel on."

Qingxian frowned and gestured to the other girls. They immediately formed a team and continued to move forward.

Smiling Face led the way, then turned back and said, "I think the sandstorm is pretty good."

"why?"

"Because we are surrounded by the enemy."

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