City Yoga Lessons

The futer in the past atlantis one of the oldist city's in the world but also the most advanced unfotanitly it sank in the atlintic ocean never to be seen agian so tell me how dose one of the most advanced citys of all time just go down like that i mean they had flying cars made of stone wepons way beyond our time elecricity shelds and even 30% of there brain unlocked they could of easly servived so why did'int they?