An “Emergency Evacuation” is required when immediate or very imminent threat to human life is at stake, requiring quick and timely evacuation of personnel. In such a case the SAR helicopter can take up to 25 passengers.
Source: NOGEPA Industrial Guideline No. 20, Alerting Procedure SAR Helicopter for Drifting Vessel (NUC) Offshore, Netherlands, Version 0, January 2009. Global Standards