Chapter 93 - 82 Atmospheric Pressure (4K)
"Board the boat."
Jiao Cheng waved his hand, and everyone boarded the three wooden boats.
Di Wu stood at the bow. He moved aside the iron chains fastened to the wooden boat, allowing the other two to pick up oars and paddle, steering the boat along the cave walls. He then lifted an open-mouthed jar from the bottom of the boat and dipped a brush into it.
As the wooden boat moved forward, Di Wu used the brush to apply an intermittent dashed line high up on the wall.
Is that... Fluorescent Powder?
Li Ang squinted. The cave walls touched by the brush faintly sparkled with a dim green light.
There are even fainter traces of Fluorescent Powder ahead in the cave, proving Jiao Cheng and the others aren’t here for the first time—they’ve explored many times before, using Fluorescent Powder to mark the route. Since Fluorescent Powder fades over time, it needs to be reapplied multiple times. And this Dark River... both the cave ceiling and the upper walls show signs of long-term water erosion. That proves the water level is usually very high; only now has it receded enough for boats to pass.
Indeed, just as Li Ang had anticipated, the three boats continued to sail forward, choosing their path using the Fluorescent Powder markings whenever they encountered a fork in the river.
The shape of an underground river is controlled by geological structures and fissures. Surface seasons, rainfall, and geological collapses can all affect its shape, making the terrain extremely complex. Within the same aquifer lay multiple interconnected dark rivers—some rapid, some slow; some flowing upward, others downward—with countless forks. Losing one’s way could have unthinkable consequences.
In the oppressive space, it seemed only the sound of water remained.