Recs if you like Starfish...

…are you certain whatever you’re doing is worth it?

or, books with similar vibes as the game subnautica

Life began underwater. Humans yearn to go back, and sometimes, they really shouldn't... A crowd-sourced list of stories that take place primarily underwater.

ocean planet colonisation and deep-sea extraction technologies

Some monsters are so large they do not live in the sea; they ARE the sea. These are the ancient deities of the trench, the guardians of the underwater ruins, and the serpents that encircle the world. When they roll over in their sleep, the tsunamis follow. They are the law of the salt and the lords of the foam. We call them... the Tide-Lords