You breathe underwater like a fish and you can't breathe above water. You have a time limit before you start dying when you are above water.
This is still in its development phase, suggestions are welcomed!
Installation guide:
Drop into mods folder on client and server (if you have a server)
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Minecraft: Java Edition
Platforms
Supported environments
Client and server
Creators
Details
Licensed MIT
Published last year
Updated last year