" An aqualung.


breathing underwater is difficult for wizards. Thereis gillyweed which is difficult to get. A wizard could transfigure themselv es, but then there is the risk of the animal nature taking control over the human part. A simple bubble chrm could work, but it slows a swimmer down and blurs vision.


An aqualung provides oxygen without obstructing vision and is almost risk free.

It really is interesting."