controllable because they would be able to shut off electricity to it. unfortunately in the case of swissair 111, they were unable to do that. >> wear and tear on the entertainment system wiring created an opening that allowed electricity to jump out, an arcing event. the arc occurred right next to the wires that powered the flight deck's most crucial equipment. setting off a fire that spread across the cockpit attic, burning through the ceiling. >> the situation as in the final few minutes of flight was catastrophic. the airplane's full of smoke, there is evidence of multiple aluminum that's being rained down overhead. the electrical systems are failing. pneumatic systems are failing. one by one, everything that they need to keep the airplane in flight is failing. and they finally lose control of the airplane and it rolls toward the ocean and accelerates and impacts the ocean at a very high speed.