:’) The Sinking Lands, which lay west of the current coast of Britain, and including (generally speaking) the better-known Lyonesse, survived in British legend into the Middle Ages (and thereafter, as written versions); at least one similar survival into modern times concerns stuff submerged in what is now The Wash. Evidence of their former existence as dry land takes the form of submerged, broken-off forests (rooted stumps), the odd stone artifact, etc.
There was a post not long ago about a submerged forest off the U.S. coast, off Oregon if memory serves.
Found a burnt effigy of an SUV and a shrine to Al Gore down there.