Grew up in New Caledonia but I now live in Australia. Yes the bought of them being wiped out by a flood totally makes sense.
Ideally memory serves, the first time I heard of Mu was when I was kid watching The Mysterious Cities of Gold.
Ah I have found the scene on YouTube:
And there were stories saying our pacific islands could be the tips of the highest mountains of Mu.
But do you know where the theory of the existence of Mu came from?
Oddly enough..many of the pacific islands ARE the tips of seamounts..
Interestingly, Putin has just announced submarine nuclear powered drones capable of creating tsunamis 500 meters high.
Perhaps we are about to join Atlantis and Mu in legend.
Whether we do or not, sooner or later society will either surpass this nuclear threshold, or perish once and for all. I vote for surpass now. =)