For additional info:
With respect to immediate diversion and landing, on ETOPS aircraft the Class C compartment fire suppression must be able to suppress a fire for the full duration of the ETOPS rating (which may be as much as 180 minutes) plus an extra 15 minutes. This means installing larger capacity fire extinguishers with a multiple shot capability. The first shot is fired when the fire detection sounds the alarm and further shots at specific intervals as the diversion progresses.