"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.
