right near the dam. the surging waters leading to fears of large-scale devastation and the country warning of an environmental disaster. settlements downstream are flooding. residents in the danger zone are being urged to aevacuate. you can see water creeping into kherson city. there are more than 800 people in the region have been forced to leave their homes. officials are warning people, do everything you can to save your life. ukraine s president holding an emergency meeting with top officials to address this crisis. let s get with our sama kyly in kharkiv. walk us through how many are in danger. reporter: the numbers of people in immediate danger are concentrated, really, potentially on the russian-occupied side of the river. this is still ukrainian territory on the eastern side because the higher ground is to the west. the biggest city downriver from this dam is obviously kherson city. local authorities there have begun evacuating significant