malaysian flight 370. this morning we're getting a clearer picture of the plane's final moments in the sky. the final five minutes believed to be the jet's spiral into the ocean. abc's david kerley has the latest. >> reporter: the new theory about the end of the malaysian flight 370 has the jet spiraling into the sea.:c with the wide body 777 running out of fuel, australian investigators believe one engine flames out but the autopilot adjusts and keeps the jet fly willing. soon the second engine quits, cutting power, turning off the autopilot. that's when the plane starts falling with the australians believing that the jet starts a spiral. a corkscrew spin dive that would have lasted for at least five minutes before finally slamming into the ocean's surface. investigators say the crew was unresponsive, but why? was it a lack of oxygen due to a mechanical failure or was this intentional? it's still a mystery. what the report does say is that for the last five hours of flight, the computer was flying the plane. >> we are confident the aircraft