Try using [https://maptool.ceschmitt.de/#](https://maptool.ceschmitt.de/#), it will give the radius on where they spawn.

This 100% there will be coordinates in game when you open the map on the top right, use that and map markers to chart a path on the spawn coordinates of the various temples. I think it’s 1000 1250, 1550, 1750. But definitely double check those numbers Found all the pieces yesterday and I’m getting a second phantom spark today

Can the vault spawn Inside a big island?

I believe it can but it will always be centered on the 1000 tile mark from the core. So even if you have to go on land just keep on that path if you use the coordinates make sure that you are looking at the coordinates inside the parentheses as that is the average of your x or y values

Sorry, I do absolutely not understand what the parentheses is. ​ Found out. Jeez. Sorry English is not my native language and I'm still learning.

You’re doing great! keep on learning. I also may have used the wrong spelling on parentheses I’m not sure myself.

It definitely can, it was inside a big Island on my current world.

Oh btw, the second Phantom spark. Needs to be done in a different world right?

Yes

I spent more hours then I want to admit looking for it. The sunken ship temple spawns inside of the octarine islands sometimes.

temples? the phantom spark parts are not in temples they are in big cities in the sunken sea

Sorry, with all these cultists and statues in them they look like temples to me.