Underwater Islands

I'm trying to get some arms to my prawn from the underwater islands. I thought it would be a fairly safe place since i didn't get attacked once in west mushroom forest, but the bone sharks somehow seem to be way more agressive in underwater islands. I read that they are sensitive of light and get alerted by it, but i still can't get them to not constantly attack my seamoth. Any suggestions? Btw, I do not have a cyclops and just got the prawn with no upgrades

Is it worth it building a base on the underwater islands?

I have been considering it for a while and when i saw the only hostile thing there are the bone sharks (which are easy to deal with imo) i got REALLY interested in the biome. I also heard there are a lot of resources there, mostly uraninite at the bottom, which i could use for a nuclear reactor and most the useful materials can be found there or in the nearby biomes. Without mentioning it has a border with the blood kelp zone, and there is a good entrance to the lost river there.

The question is: is it worth building a main base at? (I mean an actual main base, where all my stuff will be and where i will spend most of my time at)

So far i have built in the safe shallows, grassy plateaus, kelp forest, mountains, bulb zone, mushroom forest, floating island, grand reef, jellyshroom cave, deep grand reef, sea treaders path, ILZ and ALZ, blood kelp zone, and the lost river. I've built a LOT of bases. Oh yeah and the void

I want to go to the Underwater Islands, but I CAN NOT find them, could someone tell me where they are?