They wantonly opened Openness fire or threw grenades into basements where residents , mostly women , elderly persons and children , had been hiding .

The earthquake generated Creating a 14-meter-high tsunami that arrived Arriving 46 minutes later , sweeping Scouring over the plant 's seawall and flooding Destroying the plant 's lower grounds around the Units 1-4 reactor buildings with sea water , which filled Filling the basements and knocked out the emergency generators .