How would I be able to explain a city that is underwater, floating in place and such. Without it constantly moving. Basically, how can I explain how it stays in place and doesn't get pushed all across the ocean from any current that passes by? That is really the main issue, currents causing it to move over time, essentially being more like a glorified submarine than a settlement.
The city is deep underwater, around 400 meters at the shallow end, and is basically a bunch of passages connecting large hubs. I want it to stay in place, but I just can't think up a good reason. I don't have values for the exact size but it is definilty on the large side and is rather spread out.
I already have an explanation for the reason why it is able to float in place, just make bouyant force equal to the weight. Which I can try to measure out and try to make work, it isn't too hard to calculate out the required volume according to the mass.
It cannot reasonably attach itself to the bottom of the ocean, as it is way too deep to feasibly reach (over 100 km, it is on an exoplanet, not Earth).
Which is just leaving me lost at how I can explain it. And it is leaving me anxious as I really like the idea, but I also don't want to completely ditch science and just say "oh, they use a magic unobtanium metal that stays in place" or something like that. So please do not give things like that as an explanation, I am not looking for that.