C338 Stone Mechanism

Why did the water rise so high? Where is the mechanism here? Saner screamed and looked around.

I anxiously looked at the four walls and flipped in the air. My feet happened to be on the wall and I couldn't see any natural stones on the top of the stone door which was a few meters tall. I jumped down and quickly looked behind the door.

How strange! If we can't get close to the gate