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... orridor, winding through the paths marked on the rock walls until he found a higher sloping terrain in the corridor.
After carving an arrow into the wall, Bi Fang explained to the drone.
“Within these caves, we must be careful of rising groundwater levels. Here, it’s common to hear the water without seeing it. One step may be on solid rock and the next could unexpectedly be over a deep pool. In case of a cloudburst, it’s quite possible for the water to fill the cave overnight.” < ...
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