Allyra nods and climbs into the boat, closing securing the scroll in the silver tube (and/or her own scroll case) to make it waterproof.
“How about we start right here around the corner, to see what's hidden there, and then proceed along the left cavern wall towards the leftmost shore?”
The boat begins to drift as soon as you place it in the water around the corner. The current is strongest here, for almost all of the water which comes into the area from the other corner flows out along this passage.