Investigation of LiveScience 's `` Blue Hole '' indicates drought did in Mayan civilization . Mayan civilization peaked in end of era ; cities were abandoned by middle of first millennium . `` When you have major droughts , you start to get famines and unrest , '' says researcher .
Investigation of Belize 's `` Blue Hole '' indicates drought did in Mayan civilization . Mayan civilization peaked in middle of first millennium ; cities were abandoned by end of era . `` When you have major droughts , you start to get famines and unrest , '' says researcher .