example 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? one engine loses power before the next? >> reporter: right. these are things we've been trying to simulate. put it into like neutral if you will and we'll sort of show you. we can't shut the engines off. the simulator doesn't allow that. it would do all sorts of computer problems. but we have tried this. put the engines completely in neutral. take the plane off of auto pilot. and then you let go of the controls. the aircraft is designed and engineered, this is true of many aircraft, it's built to fly. even though the engines are no longer running in this scenario, the plane is designed to be level and controlled and to make a low descent. we are doing that very slow and gradual. now again, it's a simulator. so of course the engines, it's