This is a minecraft datapack that makes the oceans generate much deeper than usual.
See full description on Modrinth.
The main branch is the datapack for version 1.21.11 - 26.2.
If you need another version, change to the branch corresponding to that version (e.g. ver/26.3).
If the version you want doesn't have a branch for, it is not supported.
You can download this datapack on Modrinth, or from this github repository.
If you prefer to download from the repo, Click on the green "Code" button, then "Download ZIP".