The Bubble-Head Charm (incantation unknown) is the most effective spell for breathing underwater or in any environment where fresh air is at a premium, allowing one a supply of oxygen.
Effects
It causes a protective bubble to form about the caster's head, described to look like upside-down fish bowls; this bubble may allow for underwater exploration or to avoid nasty smells, although wizards with bad breath have reported problems after the first thirty minutes[1].
Known uses
| Caster(s) | Date | Notes |
|---|---|---|
| Cedric Diggory | 24 February, 1995 | Used during the Second Task of the Triwizard Tournament to enable them to breathe underwater.
 |
| Fleur Delacour | ||
| Hogwarts students | 1996 | Students also used this spell after the departure of Fred and George Weasley, when it became fashion to throw Dungbombs and Stink Pellets in the corridors of Hogwarts. |
Behind the scenes
Fleur Delacour using the Bubble-Head Charm during the Second Task
- A similar full-body spell called Ebublio is seen in the Harry Potter video games.
- In the films, the charm creates a bubble around the mouth and nose, similar to an oxygen mask, not the entire head.
- It's unclear why Harry Potter was unable to find information on this spell while researching for the second task. It is possible that the spell was a relatively new invention not covered in many books as of 1995, or that the spell was not commonly used for breathing underwater, but for other purposes. It was also said that Harry searched for a spell "that would allow human to survive without oxygen", rather than for some form of oxygen supply.
Appearances
- Harry Potter and the Goblet of Fire (First appearance)
- Harry Potter and the Goblet of Fire (film)
- Harry Potter and the Order of the Phoenix
- Harry Potter and the Cursed Child (Mentioned only)
- Harry Potter and the Cursed Child (play) (Mentioned only)
- Wonderbook: Book of Spells
- Fantastic Beasts: Cases from the Wizarding World (Mentioned only)
