What announcement is made to signal rapid deplanement?

The announcement indicating rapid deplanement is specifically designed to ensure the safety and efficiency of the evacuation process in emergency situations. Therefore, stating “Deplane immediately and leave your personal belongings” conveys the urgency required for such a scenario. This directive instructs passengers to prioritize their swift exit over gathering their personal items, which is vital in situations where time is critical and safety must be the foremost concern.

The other announcements, while they may communicate the deplaning process, do not possess the same level of urgency. For instance, an announcement suggesting passengers remain seated or to deplane at their convenience implies a more relaxed approach, which is inappropriate in an emergency context. Similarly, stating that deplaning will begin shortly does not communicate the immediate need for evacuation that may be required in an emergency situation.