. >> reporter: when katie lidecy dove in the pool in london this >> here she is in the olympic final. >> lidecy out first. she went out really fast. >> everybody criticizes the announcers for saying i was going out too fast. honestly i was. >> lidecy is holding on. when you're 15 years old go out and race. >> i remember flipping at the 600 mark. it was like waking up from the i'm in an olympic final. i'm win what is this ? >> lidecy with a new american record. >> just goes out and kills it and destroys it. she knows what she's doing. it's fun to watch her. >> reporter: katie lidecy was the youngest member of team u.s.a. at the 2012 olympic games. have support from bethesda. >> katie, katie. >> reporter: if lidecy's london olympics was in the swimming pool. carrying her to the undisputed top of the swim world. >> katie lidecy surging to the head of the field. with the gold. the greatest free styler in the world. >> world champion again in world record fa performances in world swimming championship history. blowing away the world record. >> reporter: her mission accomplished. lidecy won