It’s a tense thing. The processes is flooding, if it’s already happened then it flooded.

Ie: The Bering Strait land bridge flooded 10,000+ years a gap and it’s still under water. https://en.wikipedia.org/wiki/Beringia

Ultimately sea level rise is a temporary thing. Given enough time the oceans will boil as the sun ages unless something drastic changes.

Thanks, I learnt something new.