it doesn't do much, but it does remove the air bubbles when you have water breathing, any effect with "Gills" in its name (actually translation key), or any origin from Origins which has the "You can breathe on water, but not land" buff/debuff
In theory, it should work with just about any Minecraft version, but only 1.18.2 is tested.
External resources
Project members
sschr15
Owner
Technical information
License
MIT
Client side
required
Server side
unsupported
Project ID