katya, now separated, traveled on without knowing if the young girl survived until -- >> one tworks,>> reporter: cnn found her in the basement of a children's hospital in eastern ukraine after surviving lifesaving surgery. for katya, the relief is overwhelmed by the horrors of what she witnessed. >> i saw a lot of dead people, a lot of graves on the street, for example, in my yard. and um, i started to believe that they crazy because they were like maniacs. >> they were maniacs to you? >> yes. they're really crazy, like nazis in the second world war. >> reporter: after escaping, ka katya remembered the videos she recorded before the russians ravaged mariupol. ukrainians protesting outside the now-famous theater that, in a matter of weeks, would be the site of one of the most grotesque bombings in this war. the theater, still in tact. the city's buildings unscathed. she sees the peaceful faces of family and children. the video is hard to watch. are these people alive? or left in makeshift graves around the city? katya doesn't know and, for her, there is only way to deal with this haun