Retain the fear of losing it all with one careless death in Hardcore Mode, but keep the built-in functionality of your diving suit that is otherwise disabled in this challenging mode.
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Have you ever wondered why a diving suit might not come with its regular safety warnings just because a different gameplay mode has been selected? Sure, it adds to the challenge, but dying 50m underwater while you're engrossed in restructuring your base is a crime best solved by functionality the player's diving suit already has - an audible oxygen warning!
The video is recorded in Subnautica: Below Zero but the mod works the same way in Subnautica too.
Installation:
Use your favourite mod manager to install the mod, or extract the contents of the zip file to Subnautica/QMods.
Choose an existing hardcore playthrough or a new one and experience the oxygen warnings you've been missing so much.
It's open source in case you want to see what's going on.
Aaaaand that's all there is to it. Have a great time out there in the ocean waves and good luck not dying in Hardcore Mode!