C507 Suspicious traces (2/2)

But in fact... At that time, the situation was not that urgent and the high-ranking officer was clearly someone with status in the evil organization. He shouldn't have run away so recklessly, right? Besides... At that time, Lu Shan had brushed past that group of people, but he hadn't felt any indication that these people were running fast!

Generally speaking, even a well-trained athlete, after running at high speeds for more than a minute, would definitely be out of breath. At the very least, their breath wouldn't be as stable as usual.

So... Judging from this, that group of people did not run at all! This also meant that … It was impossible for them to have passed through the entire tunnel, and rushed over from an area near the Central Hall!

Then... Where was that high team when they received the report? He couldn't possibly stay in this passageway forever, right? This... Could it be that somewhere in this path, there was a Hidden Door that could lead to another area of the Secret Base?

Lu Shan's eyes immediately lit up, and he immediately slowed down his footsteps. He continued to walk towards the secret passage while carefully observing the two sides of the passage, and carefully listening for any suspicious sounds.

However, Lu Shan quickly realised that if he kept on searching like this, it would be too slow. He might not even be able to find the Hidden Door that he was hiding at all, and he might just run out of time to go into Stealth!

He immediately changed his method and moved quickly to the exit of the secret passage. Then he turned around and walked back to the passage at the normal speed of a normal person.

This way... He walked back for another minute before he started to observe the two sides of the corridor carefully.

If his judgement was correct, Gao Feng's group should have also been near the exit, which was why they were able to reach the exit within a minute or so. Therefore … If there really were Hidden Door in the tunnel, they would definitely be within a certain radius.

After determining the general area of doubt, Lu Shan searched even more carefully. It wasn't long before he found an extremely suspicious location.

If one did not look carefully, they would not be able to see any difference between that place and the surrounding stone walls of the tunnel. All of the walls were formed from jagged and uneven mountain rocks, but when Lu Shan observed them carefully, he realized that … In this place, there was a piece of rock the size of two palms, looking extremely smooth. It was as if someone was constantly rubbing the rock with his palm … This fellow, he was so engrossed that he was about to drop the pulp!

Speaking of which... If it was the rocks on the mountain outside, some of the stones would look smooth, but this place was a man-made tunnel. The walls on both sides of the tunnel were full of potholes, but only this place was smooth like this.

So... Lu Shan was basically able to confirm that this location should be where the Hidden Door in the Secret Base was headed to in another region! However, what he was slightly worried about now was … I wonder if this Hidden Door was manually activated? Or was it controlled by an electronic level, or something like a password? If it was the latter, then Lu Shan would have no choice but to break through the door violently!