Given the importance of the ocean to both island cultures, its not surprising that both utilize spirals as their symbol of mystical badassery. But now that you bring it up, I’m imagining Uzushio also being a voyager society and that is SO DOPE?!
Like. I shouldered my way into a rant about how the Uchiha clan probably isn’t as extinct as it seems on paper and I’ve always had so many overflowing feels about Uzushio, so this is a FANTASTIC possible solution to that, anon, so thanks!
Because. Just. Obviously, a good chunk of Uzushio did die. But maybe not as many as we think. Maybe some of them did flee to the mainland, leading to the smattering of Uzushio descendants that we know from canon (and some that we don’t necessarily know–but I have separate headcanons for that). But what if the rest of them just left?
Maybe at first, they hid. Even if their barrier failed to stop the incursion from Mist (though I follow @blackkatmagic’s theory on Danzo being involved in some internal sabotage there) there’s no way NO ONE was able to get to some kind of failsafe shelters for noncombatants. Konoha’s “secret” shelters/bunkers inside the Hokage mountain cannot be the only kind of fortified fallback.
So maybe they hid. They hid for as long as they could, for as long as their supplies would last. They waited for Konoha to send reinforcements or aid or anything that their alliance should have guaranteed for them. But nothing. Because Danzo（╬ಠ益ಠ)
And so, because they were mostly noncombatants–scared but all that remained of Uzushio–they decided to leave. They decided to revive their voyaging ways that had been nearly forgotten when Konoha was founded, when Konoha had falsely promised eternal sisterhood. Some of the noncombatants were elders who–while they may not physically kept their voyaging skills–still remembered the lessons that their elders had passed down. And so the remnants of Uzushio fled the Elemental Nations entirely, forsaking the continent that had forsaken them first.
Until, maybe, news of an Uzumaki–powerful, yes, but kind and determined and passionate–spreads even beyond the Elemental Nations. To where the flotilla of Uzushio can hear and begin to consider voyaging back home.