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Lifting the corner of the straw stack around him, a stone staircase appeared in front of everyone's eyes.

"Have you made sure what's down here? Lord Lucisfa? ”

"Not yet, but it's probably the rumored 'one'."

“…… Help me and be careful not to move too much. ”

With the concerted efforts of everyone, the stone staircase soon revealed its full appearance, extending down for nearly two meters, flanked by walls paved with flat stone slabs, and at the end of it was a cold gate made of metal, who knows how such a thing could exist in such a place full of the atmosphere of ancient tombs.

"It's quite thick, at least twenty centimeters, and it's a bit difficult to break through from the front, but it's worth a try."

Chen Yi withdrew his finger knocking on the door and said seriously.

"Well, I agree with you, it's worth a try. Small electricity! ”

(I've told you to change my name!) ）

The elven girl who turned into a pale golden light appeared in Su Yuan's ears, rushed towards the center of the steel gate like the wind, and after a while, she swirled back to Su Yuan's side and disappeared.

"Tick."

After that, just as Chen Yi was stunned, the thick steel door actually opened by itself!

"That'...... That...... What is that! Unexpectedly, the 256-bit password lock was unlocked so quickly, and identity authentication was required to unlock it! How did you do it? ”

How? Needless to say, Noelle knew about it, and Lu Qianfa should be able to see it with her experience, only Chen Yi was kept in the dark among the group.

"Hmph, a good servant always has one or two unknown nirvana."

But how could Su Yuan tell him?

Looking at Chen Yi's stunned appearance, Su Yuan was secretly refreshed, not only sold a good man to Lord Lu Qianfa, but also pretended to beep in front of Chen Yi, how about it? Convinced, right?

Getting back to the point, after the door opened, Su Yuan thought that he would be able to see a straight passage, but how could he think that it was still pitch black below, except for the steps that continued to extend downwards and there seemed to be no end in sight.

"Elph, borrow the power of the light elves, let's go."

Su Yuan made a decisive decision.

"Hmm...... Be! ”

――――――――――――――――――――――――――――――

"Chen Yi, try it with a lighter."

"Oh...... It should be safe. ”

The steps were not endless, and Su Yuan walked down about 80 steps before reaching the bottom.

Now, in front of Su Yuan and his entourage is an arched passage, the side wall of the passage is extremely smooth, the granite inlaid on it seems that you can still see the traces of cutting left when this passage was built, and the ground is completely tamped with natural soil and sand, and people can not leave footprints on it at all.

The passage is not completely straight, with square protruding sections on both sides, which seem to be used as storage space.

"Well, it smells of nitrate...... It can't be wrong, it seems that the rumors we heard in school are true! After Su Yuan wiped a handful of dust on the ground and sniffed it, he jumped up excitedly, "The rumors that our country built a large number of fortifications in the north in order to deal with possible aggression in that chaotic era are true!" This perfect cutting, this design without any support, can only be done by the magical sappers of the Republic! ”

"Hey," Chen Yi raised his hand weakly, "Now we have changed our name to Daya Union, and we are just one of the state ......"

"It doesn't matter!" Su Yuan's big hand waved handsomely, "The important thing is that this kind of conjecture of my own long, long time ago has been confirmed, and it is intoxicating and satisfying!" ”

"Obviously, we may have found another way out, which is even more important!"

“…… It's also ha. ”

Su Yuan smiled awkwardly.

(Damn, I was actually complained about by that guy!) ）

"Brother Su Yuan, look! There's a box here! Hey! …… Huh? ”

Su Yuan twisted his head to Elph, who left the team halfway, and quickly twisted his head back.

You don't have to look to know that this secret passage has long been emptied, and even the lighting system has been abandoned, leaving only the coded door at the entrance still functioning.

Against the backdrop of global cooling, reduced grain production, and the gradual depletion of resources, it is impossible for the Greater Asia Union to have spare strength to support the operation of such a temporarily useless fortification in non-war times.

"Whew~ It's going to be liberated, this place is dark and stuffy, I guess I haven't passed the gas for 20 years, right? But it's up to me to wake it up, Tin! ”

(I guess it's up to me to wake it up!! ）

“……”

Chen Yi's eyes were about to pop out, that electric switch was no less powerful than the electronic door at the entrance in terms of protection strength, but how could Su Yuan shout it open with a word?

In Chen Yi's eyes, all this is as magical as the legendary "open sesame".

Su Yuan can be regarded as having enough of the addiction of the cool male protagonist today.

"Okay, okay, it's much more comfortable now...... What is that? ”

After restoring the circulation and lighting system, while lighting up the entire passage, Su Yuan and his party also discovered more problems.

Looking back, the entire passage was straight until the entrance, but looking ahead, the passage split into three less than twenty meters ahead, and one of them was an upward staircase!

"This! How could this be! Doesn't it go straight to the other side? ”

Su Yuan immediately fell into a dilemma, of course he knew that the upward road was useless, because his purpose was only to cross this mountain range, but which of the two upward roads should he choose?

"Huh...... Have you forgotten what you're capable of? “

Su Yuan was stunned for a moment, and then looked at the source of the voice.

The blonde girl, who had always been his most trusted companion, was smiling at him.

Su Yuan suddenly woke up at this time:

(That's right!) Why not give my abilities a try? ）

The ability to perceive the structure of an object within a radius of 10 meters around oneself is "perception".

This is Su Yuan's "ability".

After expanding his "perception", Su Yuan's world became no longer ordinary.

(Here, here, here, well, all right...... Wrong! This is? …… And unexpectedly?! ）

The range that "perception" can detect is limited, and Su Yuan can't know which road leads to their destination, but he also has an amazing discovery, that is-

They're not at the bottom, there's another layer below them! And there are still people walking around in it!

"Up, as fast as you can."

After thinking about it for a long time, Su Yuan finally made his decision.

"Why? Isn't the road that continues straight to the other side of the mountain? ”

Faced with Chen Yi's questioning, Su Yuan just sneered.

"Why? Oh, I don't know if the road that continues straight leads to the other side of the mountain, I just know that there is another passage just below our one! And there's ...... in it."

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