an emergency landing in omaha, nebraska. witnesses say the man tried to open an exit door mid-flight before he was tackled and detained by fellow passengers. >>> crews are using a sub today for the first time in the hunt for flight 370. it will use sonar to map the search area at the bottom of the indian ocean and will chart any possible debris. >>> and coming up, the hunt for a bear who attacked a florida woman in her own driveway over the weekend. that survivor shares her harrowing story exclusively with us. >>> and did he accidentally tip his hand? we're live at buckingham palace with new royal baby speculation set off by prince william himself on his family trip down under. >> we'll get to that in a couple of moments, but let's begin this half-hour in south africa at the murder trial of oscar pistorius. he is beginning a second week on the stand. and once again, exchanges with the prosecution have been heated. "today's" national investigative correspondent jeff rossen is at the courthouse for us once again. jeff, good morning. >> reporter: hey, savannah, good morning. welcome to a new week and that means new drama in court. these two men are locked in a b