Looking at the walls on both sides in surprise, he began to understand why Li Jun found this place, and now it seems that it is definitely not a simple river.

"It's almost there." The middle-aged man gently poked the mural on the wall with a bamboo pole, and a large area of "whoosh" fell off, but he could still vaguely see that it was a huge arch painted on the mural, and behind the arch there were countless people digging in a tunnel.

The mural depicts the artisan excavation of the waterway, and in ancient times, a large-scale project like this was often used as a direction to preserve the process.

"What civilization has this written down this pattern?" I asked curiously.

That's not ancient petroglyphs,

Chapter 75 of "Strange Tales of Yin Mountain", surveillance video is being hit by hand, please wait a moment,

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