*As Undinar and May Harry slip beneath the waters, the first thing they notice is that this place is far from what it seems. Beneath the waves a faint green light illuminates everything; what should be dim or dark from the overcast sky and rain is instead as clear as if it were in full moonlight. Undinar notices another strange thing, the Underwave version of a dock, a neat structure of rocks to which one can tie up their possessions in order to explore above the surface unencumbered. Intelligent hands made this... mermaids probably to judge by the construction.*
*Lines of braided river weeds stake out a path away from the worst of the currents, and unless you choose otherwise, this is what you can follow. Bobbing up occasionally to make sure you're still next to your friends, you both can continue to swim, occasionally seeing another "dock."*
*After several hours of walking, you come to a curious thing. The river abruptly stops, crashing down into a large hole in the ground. For those underneath the surface, they can see the "path" leading down the waterfall, though a rock carved with the Aquan symbols for "dangerous currents" is pretty clear that it is not an easy trip...*