Mu or Lemuria is said to have been destroyed in earthquakes generated by a pole shift which occurred some 26,000 years ago, or approximately 24,000 BCE.
While Mu did not reach as high a technology as Atlantis, it supposedly, had attained some advanced technology. In particular, the building of long-lasting megalithic structures that withstood the earthquakes. It was the science of government that is sometimes said to have been Mu's greatest achievement.
There was one language, and one government. Education was the keynote of the Empire's success, and because every citizen was versed in the laws of the universe and was given thorough training in a profession or trade, magnificent prosperity resulted. A child's education was compulsory to the age of 21 in order for him to be eligible to attend citizenship school. This training period lasted for seven years; so the earliest age at which a person could become a citizen of the empire was 28. However, bare in mind that these ages are not in solar years.