Item description:

This is a small hack that overwrites the data of an unused Battlefield in the ROM to create an “Aquatic Cave” background where you can learn the “Water Rondo” dance. It has the same color palette as the caves in the Serpent Trench. The logical place to put this was in the cave between Figaro Castle and the Ancient Castle, since the Serpent Trench music plays there. Think of it as a submerged cave that was drained of water when the world was destroyed.