hospital after being saved by police. >> they've got two people in the water and a lot of people jumping in to try to save them. >> reporter: the girls, both 13 years old, were two of five kids rescued after being swallowed by a strong current on lake michigan. the first girl was pulled out in 20 minutes. >> they've got one girl out. she's unresponsive. we've just called another ambulance for them. does anybody see the other person? >> reporter: but this dramatic scene, 45 minutes into the search, of officers running after someone spotted her friend, three city blocks from where she went under. the current, so intense, some officers had to turn back. >> when we called him, he didn't pick up. my dad called. my mom called. he didn't pick up. >> reporter: marisol perez says her brother went swimming with the girls despite warnings about strong waves and rip currents. >> he just said that they were in the water playing and then the girls -- he didn't know what happened to the girls. >> some tips for summer swimmers. remain calm, swim diagonal towards the shore and don't swim alone.