underground electrical facility that also knocked out backup systems serving the world s busiest airport. how could this possibly happen to an airport this important. the first thing everybody thought was terrorism. with all the terrorism that s been going on around the world, a kind of occurred to me that everything shut down. it appears accidental but experts worry about the vulnerability of critical infrastructure. a fire of this nature that has this kind of impact on the world s busiest airport signals the info structure has not been properly thought through in terms of redundancy and resiliency. former deputy secretary for public safety in new york city. sends a message to terrorists that we have not sewn up the security and resiliency of critical assets. they are vulnerable.