they watched the engines flame out on both sides and watched it go into the mountainside. that was on autopilot that. is an example of what would have happened. >> martin savidge, if a plane runs out of fuel, as is believed happened here, how does a plane this size enter the water? are there different scenarios? is it a glide down? >> reporter: these are things we've been trying to simulate. put it into neutral, if you will, and we'll show you. we can't shut the engines off, the simulator doesn't allow that. but we have tried this, put the engines in neutral, take the plane off of autopilot and then you let go of the controls and the aircraft is designed that it's built to fly. even though the engines are no longer running in this scenario,