Where would i get started to make a handcrafted destructable map (like subnauticas)?

I know you cant terraform subnauticas map anymore but you used to be able to, and even still can with mods. Basically what i want to know is how can i make a map like Subnauticas (on a way smaller scale of course) that was made by hand and can also be changed by players? Sorry if the way i said it makes no sense, im horrendous at putting thoughts/questions into actual words

This gets asked a lot already: How to make subnautica-like terrain

I guarantee you the information is out there for a game as popular as Subnautica.

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