The Homenine and the Undersea City

The homenine kingdom is very magically advanced, while the delmer ulk are more engineering advanced. The ocean being irradiated with magic made it like, really volatile and dangerous. We will be completely inventing it, but we should assume that there is some level of like, engineering expertse here that we can use. But we arein they are also going to be figuring it out, because nobody has built an underwater city before.