1. Pillars Collapsed: field staff may be bruised beyond the control of the scene, so the place to be outside with the staff on standby to lead people to escape.
2. Natural Disasters: earthquakes greater than expected, the first to come to deal with the evacuation of the population-based exhibits. (Use loudspeakers to direct the public or broadcast position)
3. Artificial Damage: truck accident in transit, transport personnel can't give return situation. (A few minutes beforehand inform the transport of personnel notified once, in order to grasp the occurrence of the event).