According to James Churchward, some 25,000 years before the common era Mu had been a Pacific Ocean rival to Atlantis,
with its northern reach just beyond Hawaii and southern boundary between Easter Island and Fiji. Before its destruction from a volcanic explosion and rising sea levels, Mu was said to be home to as many as 64,000,000 people.
The existence of Mu was disputed already in Le Plongeon's time. Today, scientists universally dismiss the concept of Mu (and of other lost continents like Lemuria) as physically impossible, since a continent can neither sink nor be destroyed in the short period of time required by this premise.