he's answering a question about zombie flights from eckstein who asks, if the theory is true, what would the condition of the passengers be, would they be overcome by fumes, as well. martin, what do you have for us? >> reporter: the short answer to that is yes, they would be overcome by that. let me show how this could happen. this is not necessarily, nor do we say this is what happened, it's what could have happened. you would have just got to cruise altitude. we're on the way to beijing and this would have happened. that's the sound everybody knows. you can unfasten your seat belt, get comfortable. but in the cockpit, maybe this happens. the first sign that you've got a problem. this is a fire. this is the fire warnings that are going off and we're being told now that there is a fire burning say in the cargo hold and we can now maybe start to sense smoke. immediately the pilots go into action as mitchell is doing here. we're descending because that is the protocol and the plane begins a turn to the left. maybe we're heading back to where we came from or to an emergency airport. at the