My first Underwater House ... Maybe the first in GTA V ...
Only a first test to see if you can do, and see the result. It does not look bad ...
For now I had an apartment, but it could be anything. So I did a complete file, a file with only the interior, a file with an empty structure.
Perhaps in the future I'll do something else. I would leave the structure open-source, if you want to put in something else and sharing go ahead, possibly with credits.
Before opening the game, run OpenIV and go to edit mode, Navigate to common.rpf/data/level/GTA5
BACKUP water.xml in case something went wrong.
And then replace it with the one included in the archive.
Then open game and load the alebal_Underwater_House file with the editor.
You need Map Editor by Guadmaz https://it.GTA5-mods.com/scripts/map-editor,
F7 -> load -> xml -> alebal_Underwater_House
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